KSEW [210324]: Preliminary Local Storm Report

NWUS56 KSEW 210324
LSRSEW

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
824 PM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0822 PM HAIL 2 WSW WOODINVILLE 47.74N 122.14W
04/20/2008 E0.25 INCH KING WA TRAINED SPOTTER

PEA SIZED HAIL IN WOODINVILLE FOR ABOUT 5 MINUTES AROUND
8 PM. HAIL COVERED THE GRASS.

&&

$$

DFELTON

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MESO: Mesoscale Discussion 0675

ACUS11 KWNS 210309
SWOMCD
SPC MCD 210308
MDZ000-VAZ000-NCZ000-210415-

MESOSCALE DISCUSSION 0675
NWS STORM PREDICTION CENTER NORMAN OK
1008 PM CDT SUN APR 20 2008

AREAS AFFECTED...PORTIONS ERN NC AND SERN VA.

CONCERNING...TORNADO WATCH 210...

VALID 210308Z - 210415Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 210 CONTINUES.

REMAINING PORTIONS WW MAY BE ALLOWED TO EXPIRE AT 4Z AS SCHEDULED.
BY THEN...SVR POTENTIAL IS FCST DIMINISH SUCH THAT WW NO LONGER WILL
BE NECESSARY.

SFC MESOANALYSES AND RADAR REFLECTIVITY LOOPS AS OF 250Z SHOW
OUTFLOW BOUNDARY FROM ONSLOW COUNTY NC NEWD ACROSS EWD AREA THEN NWD
THROUGH CHOWAN COUNTY NC AND SUFFOLK VA. AIR MASS BEHIND THAT
BOUNDARY HAS BEEN STABILIZED CONSIDERABLY...NO LONGER POSES TORNADO
THREAT...AND CAN BE CLEARED FROM WW AS ALREADY HAS BEEN DONE PER
COORDINATION W/MHX. PRIMARY SVR THREAT WILL REMAIN WITH BAND OF
CONVECTION NOW EVIDENT FROM NC OUTER BANKS NEAR HSE...WHICH IS ABOUT
TO MOVE OFFSHORE...AND MORE LOOSELY ORGANIZED TSTMS ACROSS SRN
CHESAPEAKE BAY REGION. VERTICAL SHEAR PROFILES OVER THIS AREA
REMAIN FAVORABLE FOR STORM ROTATION WITH ANY ACTIVITY THAT CAN
DEVIATE SOMEWHAT OFF PREVAILING SSE-NNW ALIGNED MEAN WIND VECTOR AND
OFF PRE-EXISTING MESOBETA SCALE CONVERGENCE AXES OF SIMILAR
ORIENTATION. HOWEVER...OBSERVATIONALLY BASED MODIFICATIONS TO BOTH
RAOBS AND RUC SOUNDINGS INDICATE EFFECTIVE INFLOW PARCELS GRADUALLY
ARE BECOMING ROOTED ABOVE SFC...WHICH WOULD LEAD TO REDUCED TORNADO
AND DAMAGING WIND THREAT WITH TIME.

..EDWARDS.. 04/21/2008

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...AKQ...MHX...LWX...

34677710 35867685 37317700 38027690 38217619 37937535
37127588 36937600 36197572 35687546 35147553 35257561
35117591 34797635 34507653 34677660 34697687

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KSEW [210253]: Preliminary Local Storm Report

NWUS56 KSEW 210253
LSRSEW

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
753 PM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0751 PM SNOW 2 SE NORTH BEND 47.48N 121.76W
04/20/2008 M0.5 INCH KING WA TRAINED SPOTTER

SNOWING HARD AT THIS TIME. AT EXIT 34 ON I-90..SLUSH ON
THE FREEWAY.

&&

$$

BUEHNER

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KTFX [210251]: Preliminary Local Storm Report...summary

NWUS55 KTFX 210251
LSRTFX

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE GREAT FALLS MT
850 PM MDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0600 PM SNOW 5 WSW GREAT FALLS 47.47N 111.38W
04/19/2008 M3.2 INCH CASCADE MT OFFICIAL NWS OBS

A TOTAL OF 3 INCHES OF SNOW MEASURED AT THE NATIONAL
WEATHER SERVICE FORECAST OFFICE IN GREAT FALLS THROUGH
600 PM MDT TODAY.

0718 PM SNOW 9 NE BABB 48.95N 113.30W
04/19/2008 U0.0 INCH GLACIER MT TRAINED SPOTTER

SNOW WITH VISIBILITIES OF ONE HALF TO THREE QUARTERS MILE
AND TWO-FOOT DRIFTS REPORTED AT PORT OF PIEGAN. SNOWING
SINCE APPROXIMATELY 400 PM MDT.

0830 PM SNOW CONRAD 48.17N 111.95W
04/19/2008 E4.0 INCH PONDERA MT LAW ENFORCEMENT

SUSTAINED NORTHWEST WINDS OF 30 TO 40 MPH WITH
VISIBILITIES OF A FEW HUNDRED FEET. SNOWING SINCE
APPROXIMATELY 500 PM MDT.

0830 PM SNOW CHOTEAU 47.81N 112.18W
04/19/2008 E4.0 INCH TETON MT LAW ENFORCEMENT

SUSTAINED NORTHWEST WINDS OF 15 TO 30 MPH WITH
VISIBILITIES UNDER ONE QUARTER MILE. WORST CONDITIONS
BETWEEN 400 PM AND 600 PM MDT.

0830 PM HEAVY SNOW SHELBY 48.51N 111.86W
04/19/2008 E6.0 INCH TOOLE MT LAW ENFORCEMENT

SUSTAINED WEST-NORTHWEST WINDS AROUND 30 MPH WITH
VISIBILITIES UNDER ONE QUARTER MILE AND SNOW DRIFTS FROM
8 INCHES TO 1 FOOT. SNOWING SINCE APPROXIMATELY 600 PM
MDT.

0915 PM SNOW WHITEHALL 45.87N 112.10W
04/19/2008 E5.0 INCH JEFFERSON MT TRAINED SPOTTER

A TOTAL OF 4 TO 5 INCHES OF SNOW REPORTED THROUGH 915 PM
MDT...WITH LIGHT SNOW CONTINUING.

1000 PM HEAVY SNOW LINCOLN 46.96N 112.68W
04/19/2008 E10.0 INCH LEWIS AND CLARK MT DEPT OF HIGHWAYS

ESTIMATED 8 TO 10 INCHES OF NEW SNOW IN THE LINCOLN AREA.

1200 AM HEAVY SNOW 5 WSW GREAT FALLS 47.47N 111.38W
04/20/2008 M6.8 INCH CASCADE MT OFFICIAL NWS OBS

6.8 INCHES OF NEW SNOW IN THE PAST 12 HOURS. CURRENT SNOW
DEPTH IS 6 INCHES. LOCATION IS THE NWS OFFICE IN GREAT
FALLS.

0300 AM HEAVY SNOW ULM 47.43N 111.51W
04/20/2008 E12.0 INCH CASCADE MT DEPT OF HIGHWAYS

ESTIMATED 12 INCHES OF NEW SNOW.

0600 AM HEAVY SNOW 5 WSW GREAT FALLS 47.47N 111.38W
04/20/2008 M12.6 INCH CASCADE MT OFFICIAL NWS OBS

12.6 INCHES OF NEW SNOW IN GREAT FALLS SINCE NOON ON
SATURDAY. CURRENT SNOW DEPTH IS 11 INCHES. LOCATION IS
THE NWS OFFICE IN GREAT FALLS.

0733 AM HEAVY SNOW 7 N GOLD BUTTE 48.95N 111.37W
04/20/2008 E16.0 INCH TOOLE MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 12 TO 16 INCHES...WITH DRIFTS
UP TO 7 FEET. STRONG NORTHWEST WINDS OCCURRING...WITH
SNOW CONTINUING.

0755 AM HEAVY SNOW CHESTER 48.51N 110.97W
04/20/2008 E10.0 INCH LIBERTY MT LAW ENFORCEMENT

TOTAL SNOW ACCUMULATION OF 10 INCHES THROUGH 755 AM MDT.

0755 AM HEAVY SNOW HELENA 46.60N 112.02W
04/20/2008 E6.5 INCH LEWIS AND CLARK MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 6.5 INCHES SINCE 9 PM MDT IN
DOWNTOWN HELENA.

0800 AM HEAVY SNOW 9 NNE ROGERS PASS 47.20N 112.30W
04/20/2008 E8.0 INCH LEWIS AND CLARK MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 8 INCHES THROUGH 8 AM
MDT...ELEVATION IS 4200 FEET.

0800 AM HEAVY SNOW 19 NNE DUNKIRK 48.73N 111.50W
04/20/2008 E6.0 INCH TOOLE MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 6 INCHES THROUGH 8 AM MDT.

0815 AM HEAVY SNOW 5 S CASCADE 47.20N 111.70W
04/20/2008 E9.0 INCH CASCADE MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 9 INCHES THROUGH 815 AM MDT.

0840 AM HEAVY SNOW 3 N GREAT FALLS 47.55N 111.29W
04/20/2008 E12.0 INCH CASCADE MT NWS EMPLOYEE

TOTAL SNOW ACCUMULATION OF 12 INCHES THROUGH 840 AM MDT.

0900 AM HEAVY SNOW HAVRE 48.54N 109.68W
04/20/2008 E6.0 INCH HILL MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 6 INCHES THROUGH 9 AM MDT.

0912 AM SNOW 3 N DILLON 45.26N 112.63W
04/20/2008 E2.0 INCH BEAVERHEAD MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 2 INCHES THROUGH 912 AM MDT.

0925 AM HEAVY SNOW 15 W RUSSELL 48.03N 111.33W
04/20/2008 E15.0 INCH CHOUTEAU MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 15 INCHES THROUGH 925 AM MDT.

0925 AM HEAVY SNOW RUSSELL 48.03N 111.00W
04/20/2008 E12.0 INCH CHOUTEAU MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 12 INCHES THROUGH 925 AM MDT.

1005 AM HEAVY SNOW 9 N GLEN 45.61N 112.69W
04/20/2008 E12.0 INCH BEAVERHEAD MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION THROUGH 1005 AM MDT OF 12 INCHES.
LIGHT SNOW OCCURRING.

1021 AM HEAVY SNOW 15 NW NORRIS 45.72N 111.91W
04/20/2008 M8.0 INCH MADISON MT TRAINED SPOTTER

LIGHT SNOW CONTINUES TO FALL.

1021 AM HEAVY SNOW 5 N THE KNEES 48.09N 111.28W
04/20/2008 M11.0 INCH CHOUTEAU MT CO-OP OBSERVER

0.81 OF LIQUID

1038 AM SNOW 13 W WHITEHALL 45.87N 112.37W
04/20/2008 E6.0 INCH JEFFERSON MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 6 INCHES SINCE 9 PM MDT
SATURDAY AT ELEVATION 6200 FEET. STILL SNOWING.

1059 AM HEAVY SNOW 13 SSE ULM 47.26N 111.40W
04/20/2008 M12.0 INCH CASCADE MT TRAINED SPOTTER

LIGHT SNOW CONTINUING ALONG THE SMITH RIVER.

1113 AM HEAVY SNOW 10 E TOWNSEND 46.32N 111.31W
04/20/2008 M6.0 INCH BROADWATER MT CO-OP OBSERVER

THUNDER SNOW WAS OBSERVED OVERNIGHT.

1211 PM HEAVY SNOW 9 S STANFORD 47.02N 110.22W
04/20/2008 E6.0 INCH JUDITH BASIN MT NWS EMPLOYEE

TOTAL SNOW ACCUMULATION OF 6 INCHES THROUGH 1211 PM MDT.

1224 PM HEAVY SNOW RAYNESFORD 47.27N 110.73W
04/20/2008 E9.0 INCH JUDITH BASIN MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION THROUGH 1224 PM MDT OF 8 TO 9
INCHES.

0200 PM HEAVY SNOW BOULDER 46.24N 112.12W
04/20/2008 E8.0 INCH JEFFERSON MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 8 INCHES FROM 11 PM MDT
SATURDAY THROUGH 200 PM MDT SUNDAY.

0418 PM SNOW 13 W WHITEHALL 45.87N 112.37W
04/20/2008 E10.0 INCH JEFFERSON MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION FROM 9 PM SATURDAY UNTIL 418 PM
MDT SUNDAY. ELEVATION IS 6200 FEET.

0608 PM HEAVY SNOW 5 WSW GREAT FALLS 47.47N 111.38W
04/20/2008 M14.8 INCH CASCADE MT OFFICIAL NWS OBS

STORM TOTAL SNOW ACCUMULATION OF 14.8 INCHES SINCE
SATURDAY AFTERNOON.

&&

A MAJOR WINTER STORM IMPACTED THE WESTERN HALF OF MONTANA THIS
WEEKEND. BANDS OF SNOW AFFECTED PORTIONS OF CENTRAL...NORTH
CENTRAL...AND SOUTHWEST MONTANA FROM SATURDAY AFTERNOON THROUGH
SUNDAY AFTERNOON. THE HEAVIEST SNOW OCCURRED SATURDAY NIGHT AND
SUNDAY MORNING...RESULTING IN NUMEROUS REPORTS OF SNOW ACCUMULATIONS
FROM 6 INCHES TO OVER A FOOT. NEAR WHITE-OUT CONDITIONS AND SNOW
DRIFTS SEVERAL FEET DEEP IN SPOTS WERE REPORTED ACROSS NORTH CENTRAL
MONTANA DUE TO GUSTY NORTHWESTERLY WINDS. ABOVE IS A SUMMARY OF
REPORTS RECEIVED THROUGH SUNDAY EVENING. MOST ACCUMULATIONS LISTED
OCCURRED WITHIN A 12-HOUR PERIOD SATURDAY NIGHT AND SUNDAY MORNING.

$$

ACOHEN

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KMHX [210242]: Preliminary Local Storm Report...corrected

NWUS52 KMHX 210242
LSRMHX

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE NEWPORT/MOREHEAD CITY NC
1041 PM EDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0320 PM HAIL RIVER ROAD 35.51N 76.99W
04/20/2008 E0.75 INCH BEAUFORT NC BROADCAST MEDIA

0320 PM FUNNEL CLOUD BLOUNTS CREEK 35.36N 76.98W
04/20/2008 BEAUFORT NC COUNTY OFFICIAL

0327 PM HAIL RIVER ROAD 35.51N 76.99W
04/20/2008 E1.00 INCH BEAUFORT NC PUBLIC

SHADY BANKS BEACH ROAD

0335 PM HAIL RIVER ROAD 35.51N 76.99W
04/20/2008 E1.00 INCH BEAUFORT NC TRAINED SPOTTER

QUARTER SIZE HAIL AND GETTING LARGER

0342 PM FUNNEL CLOUD RIVER ROAD 35.51N 76.99W
04/20/2008 BEAUFORT NC PUBLIC

2 REPORTS OF FUNNEL CLOUDS REACHING THE GROUND NEAR SHADY
BANKS

0345 PM TORNADO RIVER ROAD 35.51N 76.99W
04/20/2008 BEAUFORT NC PUBLIC

REPORTS OF TORNADO ON THE GROUND NEAR SHADY BANKS

0355 PM HAIL 3 S CHOCOWINITY 35.47N 77.10W
04/20/2008 E0.88 INCH BEAUFORT NC PUBLIC

0417 PM HAIL 2 W CHOCOWINITY 35.51N 77.14W
04/20/2008 E0.75 INCH BEAUFORT NC PUBLIC

0434 PM FUNNEL CLOUD CHOCOWINITY 35.51N 77.10W
04/20/2008 BEAUFORT NC TRAINED SPOTTER

FUNNEL CLOUD REPORTED ON THE SOUTH SIDE OF CHOCOWINITY

0438 PM TORNADO CHOCOWINITY 35.51N 77.10W
04/20/2008 BEAUFORT NC TRAINED SPOTTER

NUMEROUS TRAINED SPOTTERS SAW BRIEF TORNADO TOUCH DOWN

0455 PM HAIL GREENVILLE 35.60N 77.37W
04/20/2008 E0.75 INCH PITT NC PUBLIC

NORTH SIDE OF GREENVILLE

0615 PM HAIL ROBERSONVILLE 35.82N 77.25W
04/20/2008 E0.75 INCH MARTIN NC LAW ENFORCEMENT

0640 PM HAIL 7 WNW WILLIAMSTON 35.89N 77.17W
04/20/2008 E0.75 INCH MARTIN NC LAW ENFORCEMENT

PENNY SIZED HAIL AND SOME MINOR FLOODING NEAR THE
INTERSECTION OF HIGHWAYS 125 AND 903.

0643 PM HAIL 2 S ROBERSONVILLE 35.80N 77.25W
04/20/2008 E0.75 INCH MARTIN NC PUBLIC

PUBLIC REPORTED PENNY SIZE HAIL AND MINOR FLOODING JUS
SOUTH OF ROBERSONVILLE ALONG HIGHWAY 903.

0652 PM FUNNEL CLOUD 5 ESE HAMILTON 35.92N 77.13W
04/20/2008 MARTIN NC PUBLIC

0728 PM HAIL 3 W DAWSON 35.34N 77.65W
04/20/2008 E0.75 INCH GREENE NC LAW ENFORCEMENT

LENOIR 911 REPORTED DIME SIZE HAIL NORTHERN LENOIR COUNTY

&&

$$

JELARDO

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KRAH [210235]: Preliminary Local Storm Report...summary

NWUS52 KRAH 210235
LSRRAH

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE RALEIGH NC
1034 PM EDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0203 PM HAIL 5 SE ROCKY MOUNT 35.90N 77.74W
04/20/2008 E0.88 INCH EDGECOMBE NC LAW ENFORCEMENT

REPORTED BY EDGECOMBE S.O. HIGHWAY 43/PLEASANT HILL RD.
HAIL COVERED ROAD.

0203 PM HAIL 7 SE ROCKY MOUNT 35.88N 77.71W
04/20/2008 E1.00 INCH EDGECOMBE NC LAW ENFORCEMENT

REPORTED BY EDGECOMBE S.O. HIGHWAY 43/BULLOCKS SCHOOL RD

0240 PM HAIL RAMSEUR 35.73N 79.65W
04/20/2008 E0.75 INCH RANDOLPH NC FIRE DEPT/RESCUE

HAIL COVERED HIGHWAY 64 OUTSIDE OF RAMSEUR.

0248 PM HAIL HIGH POINT 35.98N 80.00W
04/20/2008 E0.25 INCH GUILFORD NC BROADCAST MEDIA

FOX TV REPORTED PEA SIZE HAIL INTERSTATE 85/BRENTWOOD RD.

0310 PM HAIL HIGH POINT 35.98N 80.00W
04/20/2008 U0.25 INCH GUILFORD NC LAW ENFORCEMENT

311 BYPASS

0340 PM FLASH FLOOD SCOTLAND NECK 36.13N 77.42W
04/20/2008 HALIFAX NC AMATEUR RADIO

0340 PM FLASH FLOOD 2 N SCOTLAND NECK 36.16N 77.42W
04/20/2008 HALIFAX NC LAW ENFORCEMENT

FLOODING ON MARY CHAPEL ROAD JUST NORTH OF SCOTLAND NECK.

0342 PM HAIL N SANFORD 35.48N 79.18W
04/20/2008 E0.75 INCH LEE NC LAW ENFORCEMENT

PENNY SIZED HAIL IN PROGRESS IN NORTH SANFORD

0356 PM HAIL PITTSBORO 35.72N 79.17W
04/20/2008 E1.00 INCH CHATHAM NC LAW ENFORCEMENT

QUARTER SIZE HAIL OCCURRING IN PITTSBORO

0415 PM HAIL 5 NE PRINCEVILLE 35.94N 77.46W
04/20/2008 E0.75 INCH EDGECOMBE NC LAW ENFORCEMENT

0514 PM HAIL 2 NNE SCOTLAND NECK 36.16N 77.40W
04/20/2008 E1.00 INCH HALIFAX NC TRAINED SPOTTER

QUARTER SIZE HAIL ONGOING JUST NORTHEAST OF SCOTLAND NECK

0535 PM HAIL 2 N WAKE FOREST 36.00N 78.52W
04/20/2008 E0.25 INCH WAKE NC TRAINED SPOTTER

US 1/PURNELL ROAD

0535 PM HAIL 3 WNW WHITES FORK 36.07N 77.48W
04/20/2008 E1.00 INCH HALIFAX NC LAW ENFORCEMENT

QUARTER SIZE HAIL REPORTED ON DOUGLAS HILL FARM RD
SOUTHWEST OF SCOTLAND NECK

0536 PM HAIL 2 N WAKE FOREST 36.00N 78.52W
04/20/2008 E0.25 INCH WAKE NC TRAINED SPOTTER

ALONG US 1 APPROX 1/4 MILE SOUTH OF THE FRANKLIN/WAKE
COUNTY LINE.

0634 PM HAIL WARRENTON 36.40N 78.16W
04/20/2008 E0.50 INCH WARREN NC LAW ENFORCEMENT

HAIL UP TO THE SIZE OF DIMES REPORTED JUST SOUTH OF THE
CITY LIMITS OF WARRENTON

0820 PM HAIL 7 WNW SCOTLAND NECK 36.17N 77.54W
04/20/2008 E0.50 INCH HALIFAX NC LAW ENFORCEMENT

PEA TO DIME SIZE HAIL REPORTED ON THIRTEEN BRIDGES ROAD

1000 PM FLASH FLOOD 7 WNW SCOTLAND NECK 36.17N 77.54W
04/20/2008 HALIFAX NC LAW ENFORCEMENT

WATER COVERING PORTION OF THIRTEEN BRIDGES ROAD

&&

$$

JFB

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WATCHES: Severe Thunderstorm Watch - Number 209

WWUS20 KWNS 210203
SEL9
SPC WW 210203
NCZ000-VAZ000-CWZ000-210000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH - NUMBER 209
NWS STORM PREDICTION CENTER NORMAN OK
1003 PM EDT SUN APR 20 2008

THE NWS STORM PREDICTION CENTER HAS CANCELLED
SEVERE THUNDERSTORM WATCH NUMBER 209 ISSUED AT 145 PM EDT FOR PORTIONS OF

NORTH CAROLINA
VIRGINIA
COASTAL WATERS

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KMFR [210137]: Preliminary Local Storm Report

NWUS56 KMFR 210137
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
637 PM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0632 PM SNOW 5 NW MEDFORD 42.40N 122.92W
04/20/2008 M1.5 INCH JACKSON OR TRAINED SPOTTER

TOTAL ACCUMULATED SNOWFALL FROM SATURDAY EVENING THROUGH
9 AM PDT SUNDAY MORNING. SPOTTER LOCATED IN THE SAMS
VALLEY AT 2000 FEET ELEVATION.

&&

$$

LUTZ

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KLWX [210132]: Preliminary Local Storm Report...summary

NWUS51 KLWX 210132
LSRLWX

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
931 PM EDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1118 AM FLOOD LEESBURG 39.10N 77.56W
04/20/2008 LOUDOUN VA EMERGENCY MNGR

TUSCARORA CREEK OUT OF BANKS CLOSING LAWSON ROAD.

0138 PM HAIL NORRISVILLE 39.70N 76.54W
04/20/2008 E0.75 INCH HARFORD MD EMERGENCY MNGR

0153 PM TSTM WND DMG 1 S WALDORF 38.63N 76.90W
04/20/2008 CHARLES MD TRAINED SPOTTER

THREE TREES DOWN ON ROADWAY AND ONE TREE ON HOUSE
ATLEONARDTOWN ROAD AND RENNER ROAD

0209 PM TORNADO ST CHARLES 38.61N 76.92W
04/20/2008 CHARLES MD EMERGENCY MNGR

EF0 TORNADO AS DETERMINED BY NWS SURVEY OF DAMAGE TO
TOWNHOMES AND OUTBUILDINGS.

0225 PM HAIL BEL AIR 39.53N 76.35W
04/20/2008 E0.75 INCH HARFORD MD TRAINED SPOTTER

0235 PM TSTM WND DMG TEMPLE HILLS 38.82N 76.95W
04/20/2008 PRINCE GEORGES MD FIRE DEPT/RESCUE

SEVERAL LARGE TREES DOWN ON PATS LANE...NEAR ALLENTOWN
ROAD.

0237 PM TORNADO CHILLUM 38.96N 76.99W
04/20/2008 PRINCE GEORGES MD EMERGENCY MNGR

EF1 TORNADO AS DETERMINED BY NWS SITE SURVEY WITH DAMAGE
TO ELEMENTARY SCHOOL AND CONSTRUCTION TRAILER BLOWN OVER.

0242 PM TSTM WND DMG HYATTSVILLE 38.96N 76.95W
04/20/2008 PRINCE GEORGES MD EMERGENCY MNGR

DAMAGE TO G.E. PETERS ADVENTIST SCHOOL ON RIGGS ROAD.

0426 PM FLOOD ANNANDALE 38.83N 77.21W
04/20/2008 FAIRFAX VA EMERGENCY MNGR

ROAD CLOSED AT THE INTERSECTION OF WOODBURN ROAD AND
SPICEWOOD DRIVE

0430 PM FLOOD ARLINGTON 38.88N 77.10W
04/20/2008 ARLINGTON VA EMERGENCY MNGR

REPORT OF FLOODING SOUTHBOUND ON THE GEORGE WASHINGTON
PARKWAY NEAR 14TH STREET BRIDGE

0620 PM TSTM WND DMG 3 SW BECKLEYSVILLE 39.60N 76.81W
04/20/2008 BALTIMORE MD EMERGENCY MNGR

TREE DOWN NEAR GUNPOWDER ROAD.

0910 PM FLOOD LEWISTOWN 39.54N 77.42W
04/20/2008 FREDERICK MD EMERGENCY MNGR

ROADS CLOSED DUE TO FLOODING.

&&

$$

LEE

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KLWX [210129]: Preliminary Local Storm Report

NWUS51 KLWX 210129
LSRLWX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
928 PM EDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0209 PM TORNADO ST CHARLES 38.61N 76.92W
04/20/2008 CHARLES MD EMERGENCY MNGR

EF0 TORNADO AS DETERMINED BY NWS SURVEY OF DAMAGE TO
TOWNHOMES AND OUTBUILDINGS.

0237 PM TORNADO CHILLUM 38.96N 76.99W
04/20/2008 PRINCE GEORGES MD EMERGENCY MNGR

EF1 TORNADO AS DETERMINED BY NWS SITE SURVEY WITH DAMAGE
TO ELEMENTARY SCHOOL AND CONSTRUCTION TRAILER BLOWN OVER.

&&

$$

LEE

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KLWX [210115]: Preliminary Local Storm Report

NWUS51 KLWX 210115
LSRLWX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
915 PM EDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0910 PM FLOOD LEWISTOWN 39.54N 77.42W
04/20/2008 FREDERICK MD EMERGENCY MNGR

ROADS CLOSED DUE TO FLOODING.

&&

$$

LASORSA

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KMFR [201605]: Preliminary Local Storm Report

NWUS56 KMFR 201605
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
905 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0706 AM FREEZE MOUNT SHASTA 41.32N 122.32W
04/20/2008 M15 F SISKIYOU CA CO-OP OBSERVER

LOW TEMPERATURE OF 15 DEGREES SET NEW RECORD. OLD RECORD
WAS 17 DEGREES IN 1963. ALL-TIME RECORD FOR APRIL IS 10
DEGREES.

&&

$$

STOCKTON

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 201546
SWODY1
SPC AC 201543

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1043 AM CDT SUN APR 20 2008

VALID 201630Z - 211200Z

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF EASTERN VA AND
EASTERN NC...

...VA/NC...
REF MCD 669

MORNING WATER VAPOR IMAGERY SHOWS A DEEP UPPER LOW CENTERED OVER
EASTERN KY...WITH SEVERAL SMALLER SCALE VORTICITY AXES ROTATING
AROUND LOW. ONE OR MORE OF THESE SMALLER PERTURBATIONS WILL AFFECT
THE MID ATLANTIC AND CAROLINAS REGIONS TODAY. A PLUME OF RELATIVELY
DEEP MOISTURE IS PRESENT THIS MORNING FROM EASTERN NC/EASTERN VA
INTO PARTS OF MD AND CENTRAL PA. DESPITE PERSISTENT CLOUD COVER IN
THIS ZONE...RATHER COOL TEMPERATURES ALOFT AND DEWPOINTS IN THE
UPPER 50S TO LOWER 60S WILL HELP RESULT IN MLCAPE VALUES OF UP TO
500 J/KG LATER THIS AFTERNOON. FORECAST SOUNDINGS SHOW BACKED LOW
LEVEL WINDS OVER THIS AREA...PROVIDING SUFFICIENT LOW LEVEL/DEEP
LAYER VERTICAL SHEAR FOR THUNDERSTORM ORGANIZATION AND POSSIBLE
SUPERCELLS DESPITE RATHER WEAK INSTABILITY. PRESENT INDICATIONS
REMAIN THAT STRONGER CELLS ALONG AN AXIS FROM DCA-EASTERN NC WILL BE
CAPABLE OF BRIEF TORNADOES AND GUSTY WINDS THIS AFTERNOON AND EARLY
EVENING.

A FEW STRONG STORMS ARE ALSO POSSIBLE THIS AFTERNOON ACROSS PARTS OF
WV AND WESTERN VA/NC BENEATH COLD UPPER LOW. THERMODYNAMIC PROFILES
IN THIS AREA SUGGEST A RISK OF HAIL IN MORE INTENSE UPDRAFTS TODAY.

...DAKOTAS...
VIGOROUS S/WV TROUGH/MID LEVEL WIND MAX ROTATES NEWD FROM NRN
INTERMOUNTAIN REGION TO NRN HIGH PLAINS THIS EVE AND INTO SRN CANADA
BY 12Z MON. THE STRONG COLD FRONT NOW VICINITY ND/MT BORDER SWWD
INTO CENTRAL WY MOVES ONLY SLOWLY EWD THIS AFTERNOON AS SURFACE LOW
DEEPENS WRN SD.

STRONG 40-50KT SSELY LLJ AHEAD OF FRONT ACROSS DAKOTAS WILL BRING A
LITTLE LOW LEVEL MOISTURE NWD TODAY...WHICH COUPLED WITH THE VERY
STEEP LAPSE RATES WILL DEVELOP A SMALL AMOUNT OF MLCAPE ATOP A DEEP
MIXED LAYER BY LATER THIS AFTERNOON. HIGH BASED THUNDERSTORMS WILL
DEVELOP BY MID/LATE AFTERNOON ALONG AND JUST AHEAD OF SLOW MOVING
COLD FRONT AND WITH STRONG UPPER SUPPORT PRODUCE AT LEAST A
POTENTIAL FOR ISOLATED SEVERE STORMS.

WITH SUCH A VIGOROUS S/WV IMPULSE AND THE STEEP LAPSE RATES IN
EXCESS OF 8C/KM...THERE WILL BE AT A LOW END DAMAGING WIND THREAT
THIS EVENING AS STORMS WILL TEND TO LINE UP ALONG FRONTAL BOUNDARY
AS THEY MOVE NEWD ACROSS WRN ND SWD INTO SD..

..HALES/HURLBUT.. 04/20/2008

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KMFR [201525]: Preliminary Local Storm Report

NWUS56 KMFR 201525
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
825 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0706 AM SNOW 3 SSE COOS BAY 43.34N 124.21W
04/20/2008 M1.0 INCH COOS OR TRAINED SPOTTER

1.0 INCHES ON DECK AND YARD...BUT MELTING ON ROADWAYS.
OCCURRED OVERNIGHT.

&&

$$

STOCKTON

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MESO: Mesoscale Discussion 0669

ACUS11 KWNS 201521
SWOMCD
SPC MCD 201520
VAZ000-201745-

MESOSCALE DISCUSSION 0669
NWS STORM PREDICTION CENTER NORMAN OK
1020 AM CDT SUN APR 20 2008

AREAS AFFECTED...PARTS OF ERN VA

CONCERNING...HEAVY RAINFALL

VALID 201520Z - 201745Z

SEVERAL HOURS OF MDT-HEAVY RAINFALL CAN BE EXPECTED ACROSS MUCH OF
ERN VA. THE HEAVIEST TSTMS /HOURLY RATES 1-1.5 IN/ WILL LIKELY BE
CONFINED TO A 20 MILE CORRIDOR JUST WEST OF THE I-95 EXTENDING FROM
NEAR EMPORIA NWD TO JUST NW OF RICHMOND. ISOLD DMGG WIND GUSTS AND
PERHAPS A BRIEF TORNADO MAY ALSO OCCUR...PRIMARILY SOUTH OF
RICHMOND.

BACK EDGE OF THE BROAD WARM CONVEYOR ALONG ERN PERIPHERY OF THE SLOW
MOVING UPR LOW HAS REGENERATED WITH TSTM INTENSITY INCREASING
ALONG/W OF I-95. MESOANALYSIS PLACES A NARROW TONGUE OF 57-63F DEW
POINTS JUST EAST OF AN OCCLUDED FRONT WITH STRONGEST MOISTURE
CONVERGENCE ALONG THE NC/VA BORDER S OF EMPORIA COINCIDENT WITH A
WEAK MESOLOW. THIS LOW SHOULD MOVE SLOWLY NWD TOWARD RICHMOND
THROUGH MID-AFTN WITH THE FRONT MOVING VERY LITTLE. PERSISTENT
MOISTURE CONVERGENCE INVOF THIS FRONT/LOW WILL MAINTAIN THE THREAT
FOR TRAINING TSTMS WITH HEAVY RAINFALL FOR SEVERAL HOURS.

ADDITIONALLY...ENHANCED ESELY FLOW ALONG THE ERN QUADRANT OF THE
MESOLOW WILL BOOST LOW-LVL HELICITY AND GIVEN LOW LCL/S AND 30-35
KTS OF EFFECTIVE SHEAR...ISOLD TSTMS MAY ORGANIZE SUFFICIENTLY TO
PRODUCE BRIEF DMGG WIND GUSTS OR PERHAPS A TORNADO. ATTM...A WW IS
NOT ANTICIPATED WITH HEAVY RAINFALL BEING THE PRIMARY THREAT THROUGH
EARLY AFTN.

MORE TSTMS WILL DEVELOP FARTHER W/SW THIS AFTN AS THE COLD UPR LOW
MIGRATES SLOWLY EWD. THESE STORMS MAY BE MORE ROBUST WHERE STRONGER
INSTABILITY DEVELOPS IN CONCERT WITH STEEPER MID-LVL LAPSE RATES.

..RACY.. 04/20/2008

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...AKQ...

36617771 37457763 37927768 37957747 37767735 37367730
36947727 36747732

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KLWX [201520]: Preliminary Local Storm Report

NWUS51 KLWX 201520
LSRLWX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1120 AM EDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1118 AM FLOOD LEESBURG 39.10N 77.56W
04/20/2008 LOUDOUN VA EMERGENCY MNGR

TUSCARORA CREEK OUT OF BANKS CLOSING LAWSON ROAD.

&&

$$

LEE

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KMFR [201514]: Preliminary Local Storm Report

NWUS56 KMFR 201514
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
814 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0706 AM SNOW S SHADY COVE 42.61N 122.82W
04/20/2008 M1.8 INCH JACKSON OR TRAINED SPOTTER

IN SHADY COVE OVERNIGHT

&&

$$

STOCKTON

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KOTX [201512]: Preliminary Local Storm Report

NWUS56 KOTX 201512
LSROTX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
811 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0800 AM HEAVY SNOW 3 W CHELAN 47.84N 120.09W
04/20/2008 M4.3 INCH CHELAN WA TRAINED SPOTTER

CHELAN 36 ELEVATION 1400 FT. SNOW FELL OVER LAST 8 HOURS.
MODERATE SNOW STILL FALLING.

&&

$$

SBODNAR

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KMFR [201507]: Preliminary Local Storm Report

NWUS56 KMFR 201507
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
807 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0706 AM SNOW 2 WSW LAKESIDE 43.57N 124.20W
04/20/2008 E0.0 INCH COOS OR TRAINED SPOTTER

0.15 INCHES OF PRECIPITATION THROUGH THE NIGHT. SNOW ON
VEHICLES...BUT NOT ON THE GROUND.

&&

$$

STOCKTON

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KTFX [201451]: Preliminary Local Storm Report

NWUS55 KTFX 201451
LSRTFX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
849 AM MDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0733 AM HEAVY SNOW 7 N GOLD BUTTE 48.95N 111.37W
04/20/2008 E16.0 INCH TOOLE MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 12 TO 16 INCHES...WITH DRIFTS
UP TO 7 FEET. STRONG NORTHWEST WINDS OCCURING...WITH SNOW
CONTINUING.

0755 AM HEAVY SNOW HELENA 46.60N 112.02W
04/20/2008 E6.5 INCH LEWIS AND CLARK MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 6.5 INCHES SINCE 9 PM MDT IN
DOWNTOWN HELENA.

0755 AM HEAVY SNOW CHESTER 48.51N 110.97W
04/20/2008 E10.0 INCH LIBERTY MT LAW ENFORCEMENT

TOTAL SNOW ACCUMULATION OF 10 INCHES THROUGH 755 AM MDT.

0815 AM HEAVY SNOW 5 S CASCADE 47.20N 111.70W
04/20/2008 E9.0 INCH CASCADE MT TRAINED SPOTTER

TOTAL SNOW ACCUMULATION OF 9 INCHES THROUGH 815 AM MDT.

0840 AM HEAVY SNOW 3 N GREAT FALLS 47.55N 111.29W
04/20/2008 E12.0 INCH CASCADE MT NWS EMPLOYEE

TOTAL SNOW ACCUMULATION OF 12 INCHES THROUGH 840 AM MDT.

&&

$$

ACOHEN

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KMFR [201442]: Preliminary Local Storm Report

NWUS56 KMFR 201442
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
742 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0732 AM SNOW 5 SSW ROSEBURG 43.16N 123.39W
04/20/2008 M0.5 INCH DOUGLAS OR TRAINED SPOTTER

&&

$$

SUGDEN

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KMFR [201440]: Preliminary Local Storm Report

NWUS56 KMFR 201440
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
740 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0732 AM SNOW 1 SSW OBRIEN 42.06N 123.71W
04/20/2008 M2.0 INCH JOSEPHINE OR TRAINED SPOTTER

&&

$$

SUGDEN

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KMFR [201439]: Preliminary Local Storm Report

NWUS56 KMFR 201439
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
739 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0732 AM SNOW 2 ESE ASHLAND 42.18N 122.66W
04/20/2008 M2.0 INCH JACKSON OR TRAINED SPOTTER

&&

$$

SUGDEN

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KMFR [201433]: Preliminary Local Storm Report

NWUS56 KMFR 201433
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
733 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0732 AM SNOW 13 ESE SUTHERLIN 43.30N 123.10W
04/20/2008 E1.0 INCH DOUGLAS OR TRAINED SPOTTER

&&

$$

SUGDEN

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KMFR [201429]: Preliminary Local Storm Report

NWUS56 KMFR 201429
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
728 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0728 AM SNOW 5 NNE SELMA 42.34N 123.57W
04/20/2008 E0.5 INCH JOSEPHINE OR TRAINED SPOTTER

ON BARE GROUND AND SNOWING LIGHTLY

&&

$$

SUGDEN

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KTFX [201424]: Preliminary Local Storm Report...corrected

NWUS55 KTFX 201424
LSRTFX

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE GREAT FALLS MT
824 AM MDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1200 AM HEAVY SNOW 5 WSW GREAT FALLS 47.47N 111.38W
04/20/2008 M6.8 INCH CASCADE MT OFFICIAL NWS OBS

6.8 INCHES OF NEW SNOW IN THE PAST 12 HOURS. CURRENT SNOW
DEPTH IS 6 INCHES. LOCATION IS THE NWS OFFICE IN GREAT
FALLS.

0600 AM HEAVY SNOW 5 WSW GREAT FALLS 47.47N 111.38W
04/20/2008 M12.6 INCH CASCADE MT OFFICIAL NWS OBS

12.6 INCHES OF NEW SNOW IN GREAT FALLS SINCE NOON ON
SATURDAY. CURRENT SNOW DEPTH IS 11 INCHES. LOCATION IS
THE NWS OFFICE IN GREAT FALLS.

&&

CORRECTED LOCATIONS OF REPORTS.

$$

ACOHEN

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KMFR [201422]: Preliminary Local Storm Report

NWUS56 KMFR 201422
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
722 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0720 AM HAIL 5 N COOS BAY 43.45N 124.23W
04/20/2008 M0.25 INCH COOS OR PUBLIC

GRAUPEL SHOWER

&&

$$

SUGDEN

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KHUN [201421]: Preliminary Local Storm Report...summary

NWUS54 KHUN 201421
LSRHUN

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE HUNTSVILLE AL
921 AM CDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0115 PM HAIL HODGES 34.33N 87.93W
04/11/2008 E0.88 INCH FRANKLIN AL PUBLIC

NICKEL SIZE HAIL REPORTED AT HAROLDS GAS AND GROCERY
STORE IN THE HODGES COMMUNITY.

0125 PM HAIL FRENCH MILL 34.77N 86.88W
04/11/2008 E0.50 INCH LIMESTONE AL EMERGENCY MNGR

DIME SIZED HAIL REPORTED.

0127 PM HAIL 4 ENE ADDISON 34.22N 87.11W
04/11/2008 E0.50 INCH CULLMAN AL EMERGENCY MNGR

SPOTTER REPORTED DIME SIZED HAIL NEAR THE SARDIS
COMMUNITY.

0130 PM HAIL JONES CHAPEL 34.21N 87.05W
04/11/2008 E1.00 INCH CULLMAN AL EMERGENCY MNGR

QUARTER SIZE HAIL REPORTED IN THE CRANE HILL AREA.

0132 PM TSTM WND DMG 5 ESE ADDISON 34.17N 87.10W
04/11/2008 CULLMAN AL TRAINED SPOTTER

TREES AND POWER LINES DOWN ALONG HIGHWAY 278 ALONG THE
CULLMAN AND WINSTON COUNTY LINE.

0137 PM HAIL 5 WNW RUSSELLVILLE 34.53N 87.81W
04/11/2008 M1.25 INCH FRANKLIN AL CO-OP OBSERVER

COCORAHS OBSERVER REPORTED HALF DOLLAR SIZE HAIL 5.7
MILES WNW OF RUSSELLVILLE.

0145 PM HAIL 7 NNW CULLMAN 34.27N 86.89W
04/11/2008 E1.75 INCH CULLMAN AL EMERGENCY MNGR

GOLFBALL SIZE HAIL REPORTED IN THE VINEMONT AREA.

0146 PM TORNADO 4 NNW CULLMAN 34.24N 86.86W
04/11/2008 F0 CULLMAN AL NWS STORM SURVEY

EF-0 TORNADO WITH MAX WINDS OF 60 MPH...MAX PATH WIDTH OF
10 YARDS AND PATH LENGTH OF LESS THAN 1/4 MILE. BRIEF
TOUCHDOWN PRODUCED TREE AND POWER LINE DAMAGE NEAR THE
VINEMONT AREA.

0206 PM TSTM WND DMG MERIDIANVILLE 34.85N 86.57W
04/11/2008 MADISON AL BROADCAST MEDIA

3 POWER POLES SNAPPED. RELAYED BY BROADCAST MEDIA.

0206 PM TORNADO 3 NW RYAN CROSSROADS 34.37N 86.64W
04/11/2008 F0 MORGAN AL NWS STORM SURVEY

EF-0 TORNADO WITH MAX WINDS OF 60 MPH...MAX PATH WIDTH OF
20 YARDS...AND PATH LENGTH OF 1.2 MILES. BROAD WEAK
TORNADO PRODUCED TREE DAMAGE NEAR THE HULACO COMMUNITY.
TIME ESTIMATED FROM RADAR.

0207 PM TORNADO 3 NW MERIDIANVILLE 34.88N 86.61W
04/11/2008 F0 MADISON AL NWS STORM SURVEY

EF-0 TORNADO WITH MAX WINDS OF 70 MPH...MAX PATH WIDTH OF
200 YARDS...AND PATH LENGTH OF 3.8 MILES. IT TOUCHED DOWN
JUST SOUTHWEST OF THE PATTERSON LN-MOUNT LEBANON RD
INTERSECTION. THE TORNADO FLIPPED OVER TWO IRRIGATION
SYSTEMS...UPROOTED THREE LARGE TREES...AND SNAPPED
SEVERAL SMALL TREES. TIME ESTIMATED FROM RADAR.

0210 PM HAIL HAZEL GREEN 34.93N 86.57W
04/11/2008 E0.50 INCH MADISON AL EMERGENCY MNGR

DIME SIZED HAIL REPORTED AT THE INTERSECTION OF WALKER
LANE AND 231 JUST SOUTH OF HAZEL GREEN.

0216 PM TORNADO 5 N ARAB 34.40N 86.51W
04/11/2008 F0 MARSHALL AL NWS STORM SURVEY

EF-0 TORNADO WITH MAX WINDS OF 85 MPH...AVG PATH WIDTH OF
100 FT...AND PATH LENGTH OF 1.5 MILES. THE TORNADO
PRODUCED MODERATE DAMAGE TO THE BACK OF A
HOME...DESTROYED A SHED...AND UPROOTED SEVERAL TREES.

0218 PM HAIL 1 W NEW MARKET 34.91N 86.44W
04/11/2008 E0.88 INCH MADISON AL EMERGENCY MNGR

NICKEL SIZED HAIL REPORTED JUST WEST OF NEW MARKET.

0220 PM HAIL UNION GROVE 34.40N 86.45W
04/11/2008 M1.75 INCH MARSHALL AL EMERGENCY MNGR

QUARTER TO GOLF BALL SIZED HAIL.

0222 PM TSTM WND DMG PLEVNA 34.96N 86.42W
04/11/2008 MADISON AL EMERGENCY MNGR

TREES REPORTED DOWN NORTH OF NEW MARKET NEAR PLEVNA

0233 PM TORNADO 1 SSW GRANT 34.50N 86.26W
04/11/2008 F0 MARSHALL AL NWS STORM SURVEY

EF-0 TORNADO WITH MAX WINDS OF 75 MPH...MAX PATH WIDTH OF
300 FT...AND PATH LENGTH OF 1.2 MILES. TORNADO UPROOTED
SEVERAL TREES...AND CAUSED ROOF DAMAGE TO SEVERAL BARN
STRUCTURES AND HOMES.

0235 PM TSTM WND GST HUNTLAND 35.06N 86.27W
04/11/2008 E70.00 MPH FRANKLIN TN PUBLIC

PUBLIC ESTIMATED 70 MPH WIND GUSTS IN THE HUNTLAND
COMMUNITY.

0240 PM HAIL GRANT 34.52N 86.25W
04/11/2008 E0.88 INCH MARSHALL AL PUBLIC

REPORT RELAYED BY OFF DUTY NWS PERSONNEL.

0240 PM HAIL UNION GROVE 34.40N 86.45W
04/11/2008 E1.00 INCH MARSHALL AL TRAINED SPOTTER

QUARTER SIZE HAIL REPORTED IN THE UNION GROVE COMMUNITY.

0245 PM HAIL GRANT 34.53N 86.25W
04/11/2008 E0.50 INCH MARSHALL AL EMERGENCY MNGR

DIME SIZED HAIL REPORTED IN GRANT

0250 PM TSTM WND DMG GRANT 34.52N 86.25W
04/11/2008 MARSHALL AL EMERGENCY MNGR

TREES DOWN ALONG WITH HAIL OF UNKNOWN SIZE ON CAMPBELL
ROAD.

0302 PM HAIL CRANE HILL 34.09N 87.06W
04/11/2008 E0.25 INCH CULLMAN AL EMERGENCY MNGR

PEA SIZE HAIL REPORTED BY SPOTTER. RELAYED BY EMA.

0305 PM TORNADO 3 NNW SOUTH VINEMONT 34.28N 86.89W
04/11/2008 F0 CULLMAN AL NWS STORM SURVEY

EF-0 TORNADO WITH MAX WINDS OF 70 MPH...MAX PATH WIDTH OF
40 YARDS...AND PATH LENGTH OF 1/2 MILE. BRIEF TOUCHDOWN
IN THE HURRICANE CREEK PARK AREA PRODUCED TREE DAMAGE IN
A CAMPGROUND AREA.

0310 PM HAIL 2 SW CRANE HILL 34.07N 87.09W
04/11/2008 E0.50 INCH CULLMAN AL EMERGENCY MNGR

DIME SIZED HAIL REPORTED NEAR THE TRADE COMMUNITY.

0315 PM TSTM WND DMG HUNTSVILLE 34.73N 86.59W
04/11/2008 MADISON AL EMERGENCY MNGR

TREE BLOWN DOWN ALONG RYLAND PIKE.

0322 PM TSTM WND DMG 3 SSE LOGAN 34.09N 86.99W
04/11/2008 CULLMAN AL EMERGENCY MNGR

REPORTS OF DAMAGE TO STRUCTURES ALONG COUNTY ROAD 222.

&&
UPDATED TO ADD SEVERAL CONFIRMED TORNADO TOUCHDOWNS.
$$

BCC

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KMFR [201408]: Preliminary Local Storm Report

NWUS56 KMFR 201408
LSRMFR

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEDFORD OR
708 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0707 AM SNOW 4 E CAVE JUNCTION 42.17N 123.57W
04/20/2008 M1.0 INCH JOSEPHINE OR TRAINED SPOTTER

SINCE 3 AM PDT

&&

$$

SUGDEN

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 201239
SWODY1
SPC AC 201237

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0737 AM CDT SUN APR 20 2008

VALID 201300Z - 211200Z

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF EASTERN VA AND
EASTERN NC...

...VA/NC...
MORNING WATER VAPOR IMAGERY SHOWS A DEEP UPPER LOW CENTERED OVER
EASTERN KY...WITH SEVERAL SMALLER SCALE VORTICITY MAXES ROTATING
AROUND LOW. ONE OR MORE OF THESE SMALLER PERTURBATIONS WILL AFFECT
THE MID ATLANTIC AND CAROLINAS REGIONS TODAY. A PLUME OF RELATIVELY
DEEP MOISTURE IS PRESENT THIS MORNING FROM EASTERN NC/EASTERN VA
INTO PARTS OF MD AND CENTRAL PA. DESPITE PERSISTENT CLOUD COVER IN
THIS ZONE...RATHER COOL TEMPERATURES ALOFT AND DEWPOINTS IN THE
UPPER 50S TO LOWER 60S WILL HELP RESULT IN MLCAPE VALUES OF UP TO
500 J/KG LATER THIS AFTERNOON. FORECAST SOUNDINGS SHOW BACKED LOW
LEVEL WINDS OVER THIS AREA...PROVIDING SUFFICIENT LOW LEVEL/DEEP
LAYER VERTICAL SHEAR FOR THUNDERSTORM ORGANIZATION AND POSSIBLE
SUPERCELLS DESPITE RATHER WEAK INSTABILITY. PRESENT INDICATIONS
REMAIN THAT STRONGER CELLS ALONG AN AXIS FROM DCA-EASTERN NC WILL BE
CAPABLE OF BRIEF TORNADOES AND GUSTY WINDS THIS AFTERNOON AND EARLY
EVENING.

A FEW STRONG STORMS ARE ALSO POSSIBLE THIS AFTERNOON ACROSS PARTS OF
WV AND WESTERN VA/NC BENEATH COLD UPPER LOW. THERMODYNAMIC PROFILES
IN THIS AREA SUGGEST A RISK OF HAIL IN MORE INTENSE UPDRAFTS TODAY.

...DAKOTAS...
SHORTWAVE TROUGH CURRENTLY OVER PARTS OF MT/WY WILL MOVE
NORTHEASTWARD AND AFFECT THE NORTHERN HIGH PLAINS BY THIS EVENING.
APPROACH OF UPPER SYSTEM WILL HELP ELIMINATE STRONG CAPPING
INVERSION...AND WILL ALSO HELP PUSH A COLD FRONT ACROSS THE REGION.
A FEW STRONG/SEVERE STORMS ARE POSSIBLE MAINLY AFTER 00Z...WITH
STRONGER CELLS POSING A THREAT OF HAIL AND GUSTY WINDS.

..HART/GRAMS.. 04/20/2008

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KTFX [201216]: Preliminary Local Storm Report

NWUS55 KTFX 201216
LSRTFX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
616 AM MDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0600 AM HEAVY SNOW 3 SW GREAT FALLS 47.47N 111.34W
04/20/2008 M12.6 INCH CASCADE MT OFFICIAL NWS OBS

12.6 INCHES OF NEW SNOW IN GREAT FALLS SINCE NOON ON
SATURDAY. CURRENT SNOW DEPTH IS 11 INCHES. LOCATION IS
THE NWS OFFICE IN GREAT FALLS.

&&

$$

BRUSDA

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KVEF [201125]: Preliminary Local Storm Report

NWUS55 KVEF 201125
LSRVEF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
425 AM PDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0900 PM NON-TSTM WND GST 5 WSW INDEPENDENCE 36.77N 118.28W
04/19/2008 M88 MPH INYO CA MESONET

1242 AM NON-TSTM WND GST 4 NW INDEPENDENCE 36.84N 118.26W
04/20/2008 M72 MPH INYO CA MESONET

OAK CREEK RAWS

0254 AM NON-TSTM WND GST 9 W BISHOP 37.39N 118.55W
04/20/2008 M60 MPH INYO CA MESONET

OWENS VALLEY RAWS

0237 AM NON-TSTM WND GST DAGGETT 34.86N 116.88W
04/20/2008 M55 MPH SAN BERNARDINO CA ASOS

CHP REPORTS INTERSTATE 15 CLOSED DUE TO NEAR ZERO
VISIBILITY JUST EAST OF BARSTOW

&&

$$

JH

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DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 200935
SWOD48
SPC AC 200934

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0434 AM CDT SUN APR 20 2008

VALID 231200Z - 281200Z

...DISCUSSION...

ECMWF AND GFS HAVE COME INTO REASONABLE AGREEMENT WITH EVOLUTION OF
LARGE SCALE PATTERN THROUGH ABOUT DAY 6. LOW AMPLITUDE PROGRESSIVE
PATTERN IS FORECAST MUCH OF THIS PERIOD WITH THE STRONGER MID-UPPER
FLOW EXPECTED TO REMAIN OVER THE NRN HALF OF THE COUNTRY. UPPER
TROUGH WILL ADVANCE THROUGH THE WRN U.S. DAY 4 WITH LEAD IMPULSE
REACHING THE CNTRL PLAINS TUESDAY NIGHT. POTENTIAL WILL ALSO EXIST
FOR WEAKER IMPULSES EMBEDDED IN SRN STREAM TO ADVANCE THROUGH TX.
A LEE TROUGH WILL DEEPEN OVER THE CNTRL HIGH PLAINS WITHIN ZONE OF
HEIGHT FALLS DOWNSTREAM FROM UPPER TROUGH. THIS WILL CONTRIBUTE TO
THE FRONT OVER THE SRN PLAINS LIFTING BACK NWD AS A WARM FRONT.

A FEW STORMS COULD DEVELOP OVER KS/OK ALONG OR NORTH THE RETREATING
FRONT DAY 4 AS WELL AS FARTHER SOUTH ALONG AND E OF DRYLINE ACROSS
TX. WITH FASTER UPPER FLOW LIKELY TO REMAIN NORTH OF WARM
SECTOR...OVERALL SHEAR PROFILES WILL NOT BE PARTICULARLY STRONG OVER
MUCH OF THIS REGION. HOWEVER...THE THERMODYNAMIC ENVIRONMENT MAY
SUPPORT THE POTENTIAL FOR A FEW STRONG TO SEVERE STORMS. OTHER
ELEVATED STORMS MAY DEVELOP WITHIN WARM ADVECTION REGIME OVER PARTS
OF THE NRN PLAINS.

THREAT FOR SEVERE STORMS WILL ALSO EXIST DAY 5 INTO DAY 6 FROM PARTS
OF THE CNTRL AND SRN PLAINS AND POSSIBLY THE UPPER MS VALLEY REGIONS
AS THE UPPER TROUGH EJECTS INTO THE PLAIN ACCOMPANIED BY A COLD
FRONT AND INCREASING VERTICAL SHEAR. NWD EXTENT OF THE THREAT WILL
DEPEND ON DEGREE OF LOW LEVEL MOISTURE RETURN.

A RISK AREA MAY BE INTRODUCED IN LATER OUTLOOKS TO INCLUDE DAY 4-6
MAINLY FOR PORTIONS OF THE PLAINS. HOWEVER...PREFER TO WAIT FOR
ANOTHER SET OF MODEL RUNS IN ORDER TO ASCERTAIN RUN TO RUN
CONSISTENCY.

..DIAL.. 04/20/2008

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KTFX [200907]: Preliminary Local Storm Report

NWUS55 KTFX 200907
LSRTFX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
307 AM MDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0300 AM HEAVY SNOW ULM 47.43N 111.51W
04/20/2008 E12.0 INCH CASCADE MT DEPT OF HIGHWAYS

ESTIMATED 12 INCHES OF NEW SNOW.

&&

$$

BRUSDA

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DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 200732
SWODY3
SPC AC 200730

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0230 AM CDT SUN APR 20 2008

VALID 221200Z - 231200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...

SHORTWAVE TROUGH WILL EJECT NEWD THROUGH THE UPPER MS VALLEY AND
UPPER GREAT LAKES REGIONS EARLY TUESDAY. ATTENDANT COLD FRONT WILL
ADVANCE EWD THROUGH THE GREAT LAKES. TRAILING PORTION OF THIS
BOUNDARY WILL EXTEND SWWD THROUGH THE MID MS VALLEY THEN INTO SRN OK
OR NRN TX WHERE IT WILL LIKELY STALL AS A LOW AMPLITUDE UPPER RIDGE
WILL BUILDS OVER THE SRN PLAINS. FARTHER WEST AN UPPER TROUGH WILL
MOVE ONTO THE WRN U.S. COAST.

...MIDDLE AND LOWER MS VALLEY THROUGH THE SRN PLAINS...

PLUME OF STEEPER MID LEVEL LAPSE RATES WILL HAVE ADVECTED EWD OVER
THE MOIST AXIS CONTRIBUTING TO POTENTIAL FOR MODERATE INSTABILITY AS
THE BOUNDARY LAYER WARMS DURING THE AFTERNOON. HOWEVER...RISING
HEIGHTS ASSOCIATED WITH UPPER RIDGE BUILDING IN WAKE OF EXITING
UPPER TROUGH WILL CONTRIBUTE TO WEAK LOW-MID LEVEL KINEMATIC
PROFILES IN MOST OF THE WARM SECTOR. A FEW THUNDERSTORMS WILL LIKELY
DEVELOP IN VICINITY OF THE FRONT ESPECIALLY OVER PARTS OF THE MID MS
VALLEY REGION AS THE ATMOSPHERE DESTABILIZES. DEVELOPMENT FARTHER SW
ACROSS THE SRN PLAINS MAY BE MORE LIMITED DUE TO LIKELIHOOD OF
STRONGER CAP...BUT INSTABILITY WILL LIKELY BE STRONGER IN THIS
REGION. DESPITE THE MODEST VERTICAL WIND PROFILES...THE
THERMODYNAMIC ENVIRONMENT WOULD SUPPORT A THREAT FOR ISOLATED LARGE
HAIL AND DAMAGING WIND. GIVEN THE WEAK KINEMATIC ENVIRONMENT AND
POTENTIAL LIMITING FACTORS FOR INITIATION AND STORM COVERAGE...WILL
INTRODUCE ONLY 5% SEVERE PROBABILITIES AT THIS TIME.

...UPPER GREAT LAKES...

SCATTERED THUNDERSTORMS WILL LIKELY BE ONGOING EARLY TUESDAY FROM
ERN IA INTO WI WITHIN ZONE OF ASCENT ATTENDING THE SHORTWAVE TROUGH
AND ATTENDANT COLD FRONT. WEAK INSTABILITY AND TENDENCY FOR THE
STRONGER MID-UPPER FLOW TO REMAIN WEST OF WARM SECTOR SUGGEST ANY
SEVERE THREAT IN THIS REGION WILL BE LIMITED.

..DIAL.. 04/20/2008

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DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 200711
SWODY2
SPC AC 200709

DAY 2 CONVECTIVE OUTLOOK RESENT 1
NWS STORM PREDICTION CENTER NORMAN OK
0209 AM CDT SUN APR 20 2008

VALID 211200Z - 221200Z

...NO SVR TSTM AREAS FORECAST...

CORRECTED FOR GENERAL THUNDER OUTLOOK LINE

...SYNOPSIS...

UPPER JET MAX WILL EJECT NWD ALONG THE ERN PERIPHERY OF WRN U.S.
UPPER THROUGH THE DAKOTAS EARLY MONDAY...WHILE ANOTHER SHORTWAVE
TROUGH EJECTS NEWD INTO THE CNTRL PLAINS MONDAY EVENING...REACHING
THE UPPER MS VALLEY LATE MONDAY NIGHT. IN WAKE OF THE LEAD IMPULSE A
COLD FRONT WILL MOVE EWD AND SWD INTO THE UPPER MS VALLEY AND
THROUGH THE CNTRL PLAINS. BY MONDAY EVENING THE FRONT IS FORECAST TO
EXTEND FROM MN SWWD THROUGH SWRN KS...REACHING WRN WI SWWD INTO NWRN
OK BY THE END OF THIS PERIOD. DRYLINE WILL LIKELY MIX EWD INTO CNTRL
OK AND CNTRL TX BEFORE RETREATING OVERNIGHT.

...CNTRL PLAINS THROUGH MIDDLE AND UPPER MS VALLEY REGION...

PARTIALLY MODIFIED CP AIR WITH BOUNDARY LAYER DEWPOINTS IN THE LOW
TO MID 60S WILL ADVECT THROUGH PRE-FRONTAL WARM SECTOR AS FAR NORTH
AS KS WITH DEWPOINTS IN THE 50S LIKELY FARTHER NORTH INTO THE UPPER
MS VALLEY. PLUME OF STEEP MID LEVEL LAPSE RATES WILL EXIST IN WARM
SECTOR ABOVE RETURNING MOIST AXIS. WHILE THIS WILL CONTRIBUTE TO
DESTABILIZATION...IT SHOULD SERVE TO EFFECTIVELY CAP MUCH OF THE
WARM SECTOR TO SURFACE BASED STORMS. MODERATE MLCAPE WILL BE
POSSIBLE ACROSS KS WHERE LOW CLOUDS MIX OUT...BUT WITH INSTABILITY
MORE MARGINAL WITH NWD EXTENT INTO THE UPPER MS VALLEY WHERE
MOISTURE WILL BE MORE LIMITED. A FEW ELEVATED STORMS WILL BE
POSSIBLE WITHIN WEAK WARM ADVECTION REGIME AHEAD OF THE FRONT OVER
THE UPPER MS VALLEY EARLY MONDAY. SOME HAIL MAY BE POSSIBLE WITH
THIS ACTIVITY. STRONGER STORMS MAY REDEVELOP DURING THE EVENING FROM
PARTS OF CNTRL KS SPREADING NEWD THROUGH ERN NEB AND IA AS FORCING
ASSOCIATED WITH EJECTING SHORTWAVE TROUGH ENHANCES LIFT...PRIMARILY
IN POST FRONTAL ZONE. MUCH OF THIS ACTIVITY WILL BE ELEVATED...BUT
EFFECTIVE SHEAR INCREASING TO AROUND 40 KT AND STEEP MID LEVEL LAPSE
RATES WILL SUPPORT A THREAT FOR LARGE HAIL. STORMS DEVELOPING CLOSER
TO THE SURFACE FRONT MAY ALSO BE CAPABLE OF PRODUCING STRONG WIND
GUSTS. A SLIGHT RISK MAY NEED TO BE REINTRODUCED ACROSS PARTS OF
THIS AREA ONCE HIGHER CONFIDENCE IS ESTABLISHED.

...OK AND TX...

RICHER LOW LEVEL MOISTURE WITH DEWPOINTS IN THE LOW TO MID 60S WILL
RETURN NWD BENEATH STEEP MID LEVEL LAPSE RATES. HOWEVER...THE MOIST
BOUNDARY LAYER WILL LIKELY REMAIN SHALLOW GIVEN FORECAST SWLY 850 MB
TRAJECTORIES. SWLY FLOW ALOFT WILL LIKELY MAINTAIN A WARM EML OVER
THE MOIST AXIS WITH A CAP EXPECTED DURING THE DAY. GIVEN THE DEEPER
ASCENT ASSOCIATED WITH EJECTING SHORTWAVE TROUGH EXPECTED TO REMAIN
NORTH OF THIS REGION AND POTENTIAL FOR A STRONG CAP...THUNDERSTORM
INITIATION ALONG THE DRYLINE IS EXPECTED TO REMAIN LIMITED.
THERMODYNAMIC AND KINEMATIC ENVIRONMENT WOULD SUPPORT SUPERCELLS IF
A STORM OR TWO MANAGED TO DEVELOP...THEREFORE HAVE INCLUDED
CONDITIONAL 5% SEVERE PROBABILITIES IN THIS REGION.

...MO AND AR...

WARM ADVECTION ASSOCIATED WITH THE MODEST SWLY LOW LEVEL JET MAY
CONTRIBUTE TO A FEW STORMS DEVELOPING IN THIS REGION OVERNIGHT. THE
THERMODYNAMIC ENVIRONMENT MAY SUPPORT A THREAT FOR HAIL WITH THE
STRONGER STORMS.

...ERN NC...

COLD AIR ALOFT WITH -20 AT 500 MB NEAR UPPER LOW CENTER MAY SUPPORT
A THREAT FOR MARGINALLY SEVERE HAIL WITH STORMS DEVELOPING DURING
THE AFTERNOON.

..DIAL.. 04/20/2008

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KTFX [200626]: Preliminary Local Storm Report

NWUS55 KTFX 200626
LSRTFX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1226 AM MDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1000 PM HEAVY SNOW LINCOLN 46.96N 112.68W
04/19/2008 E10.0 INCH LEWIS AND CLARK MT DEPT OF HIGHWAYS

ESTIMATED 8 TO 10 INCHES OF NEW SNOW IN THE LINCOLN AREA.

&&

$$

BRUSDA

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DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 200619
SWODY2
SPC AC 200618

DAY 2 CONVECTIVE OUTLOOK CORR 1
NWS STORM PREDICTION CENTER NORMAN OK
0118 AM CDT SUN APR 20 2008

VALID 211200Z - 221200Z

...NO SVR TSTM AREAS FORECAST...

CORRECTED FOR GENERAL THUNDER OUTLOOK LINE

...SYNOPSIS...

UPPER JET MAX WILL EJECT NWD ALONG THE ERN PERIPHERY OF WRN U.S.
UPPER THROUGH THE DAKOTAS EARLY MONDAY...WHILE ANOTHER SHORTWAVE
TROUGH EJECTS NEWD INTO THE CNTRL PLAINS MONDAY EVENING...REACHING
THE UPPER MS VALLEY LATE MONDAY NIGHT. IN WAKE OF THE LEAD IMPULSE A
COLD FRONT WILL MOVE EWD AND SWD INTO THE UPPER MS VALLEY AND
THROUGH THE CNTRL PLAINS. BY MONDAY EVENING THE FRONT IS FORECAST TO
EXTEND FROM MN SWWD THROUGH SWRN KS...REACHING WRN WI SWWD INTO NWRN
OK BY THE END OF THIS PERIOD. DRYLINE WILL LIKELY MIX EWD INTO CNTRL
OK AND CNTRL TX BEFORE RETREATING OVERNIGHT.

...CNTRL PLAINS THROUGH MIDDLE AND UPPER MS VALLEY REGION...

PARTIALLY MODIFIED CP AIR WITH BOUNDARY LAYER DEWPOINTS IN THE LOW
TO MID 60S WILL ADVECT THROUGH PRE-FRONTAL WARM SECTOR AS FAR NORTH
AS KS WITH DEWPOINTS IN THE 50S LIKELY FARTHER NORTH INTO THE UPPER
MS VALLEY. PLUME OF STEEP MID LEVEL LAPSE RATES WILL EXIST IN WARM
SECTOR ABOVE RETURNING MOIST AXIS. WHILE THIS WILL CONTRIBUTE TO
DESTABILIZATION...IT SHOULD SERVE TO EFFECTIVELY CAP MUCH OF THE
WARM SECTOR TO SURFACE BASED STORMS. MODERATE MLCAPE WILL BE
POSSIBLE ACROSS KS WHERE LOW CLOUDS MIX OUT...BUT WITH INSTABILITY
MORE MARGINAL WITH NWD EXTENT INTO THE UPPER MS VALLEY WHERE
MOISTURE WILL BE MORE LIMITED. A FEW ELEVATED STORMS WILL BE
POSSIBLE WITHIN WEAK WARM ADVECTION REGIME AHEAD OF THE FRONT OVER
THE UPPER MS VALLEY EARLY MONDAY. SOME HAIL MAY BE POSSIBLE WITH
THIS ACTIVITY. STRONGER STORMS MAY REDEVELOP DURING THE EVENING FROM
PARTS OF CNTRL KS SPREADING NEWD THROUGH ERN NEB AND IA AS FORCING
ASSOCIATED WITH EJECTING SHORTWAVE TROUGH ENHANCES LIFT...PRIMARILY
IN POST FRONTAL ZONE. MUCH OF THIS ACTIVITY WILL BE ELEVATED...BUT
EFFECTIVE SHEAR INCREASING TO AROUND 40 KT AND STEEP MID LEVEL LAPSE
RATES WILL SUPPORT A THREAT FOR LARGE HAIL. STORMS DEVELOPING CLOSER
TO THE SURFACE FRONT MAY ALSO BE CAPABLE OF PRODUCING STRONG WIND
GUSTS. A SLIGHT RISK MAY NEED TO BE REINTRODUCED ACROSS PARTS OF
THIS AREA ONCE HIGHER CONFIDENCE IS ESTABLISHED.

...OK AND TX...

RICHER LOW LEVEL MOISTURE WITH DEWPOINTS IN THE LOW TO MID 60S WILL
RETURN NWD BENEATH STEEP MID LEVEL LAPSE RATES. HOWEVER...THE MOIST
BOUNDARY LAYER WILL LIKELY REMAIN SHALLOW GIVEN FORECAST SWLY 850 MB
TRAJECTORIES. SWLY FLOW ALOFT WILL LIKELY MAINTAIN A WARM EML OVER
THE MOIST AXIS WITH A CAP EXPECTED DURING THE DAY. GIVEN THE DEEPER
ASCENT ASSOCIATED WITH EJECTING SHORTWAVE TROUGH EXPECTED TO REMAIN
NORTH OF THIS REGION AND POTENTIAL FOR A STRONG CAP...THUNDERSTORM
INITIATION ALONG THE DRYLINE IS EXPECTED TO REMAIN LIMITED.
THERMODYNAMIC AND KINEMATIC ENVIRONMENT WOULD SUPPORT SUPERCELLS IF
A STORM OR TWO MANAGED TO DEVELOP...THEREFORE HAVE INCLUDED
CONDITIONAL 5% SEVERE PROBABILITIES IN THIS REGION.

...MO AND AR...

WARM ADVECTION ASSOCIATED WITH THE MODEST SWLY LOW LEVEL JET MAY
CONTRIBUTE TO A FEW STORMS DEVELOPING IN THIS REGION OVERNIGHT. THE
THERMODYNAMIC ENVIRONMENT MAY SUPPORT A THREAT FOR HAIL WITH THE
STRONGER STORMS.

...ERN NC...

COLD AIR ALOFT WITH -20 AT 500 MB NEAR UPPER LOW CENTER MAY SUPPORT
A THREAT FOR MARGINALLY SEVERE HAIL WITH STORMS DEVELOPING DURING
THE AFTERNOON.

..DIAL.. 04/20/2008

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KTFX [200615]: Preliminary Local Storm Report

NWUS55 KTFX 200615
LSRTFX

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1214 AM MDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1200 AM HEAVY SNOW 3 SW GREAT FALLS 47.47N 111.34W
04/20/2008 M6.8 INCH CASCADE MT OFFICIAL NWS OBS

6.8 INCHES OF NEW SNOW IN THE PAST 12 HOURS. CURRENT SNOW
DEPTH IS 6 INCHES. LOCATION IS THE NWS OFFICE IN GREAT
FALLS.

&&

$$

BRUSDA

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DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 200605
SWODY2
SPC AC 200602

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0102 AM CDT SUN APR 20 2008

VALID 211200Z - 221200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...

UPPER JET MAX WILL EJECT NWD ALONG THE ERN PERIPHERY OF WRN U.S.
UPPER THROUGH THE DAKOTAS EARLY MONDAY...WHILE ANOTHER SHORTWAVE
TROUGH EJECTS NEWD INTO THE CNTRL PLAINS MONDAY EVENING...REACHING
THE UPPER MS VALLEY LATE MONDAY NIGHT. IN WAKE OF THE LEAD IMPULSE A
COLD FRONT WILL MOVE EWD AND SWD INTO THE UPPER MS VALLEY AND
THROUGH THE CNTRL PLAINS. BY MONDAY EVENING THE FRONT IS FORECAST TO
EXTEND FROM MN SWWD THROUGH SWRN KS...REACHING WRN WI SWWD INTO NWRN
OK BY THE END OF THIS PERIOD. DRYLINE WILL LIKELY MIX EWD INTO CNTRL
OK AND CNTRL TX BEFORE RETREATING OVERNIGHT.

...CNTRL PLAINS THROUGH MIDDLE AND UPPER MS VALLEY REGION...

PARTIALLY MODIFIED CP AIR WITH BOUNDARY LAYER DEWPOINTS IN THE LOW
TO MID 60S WILL ADVECT THROUGH PRE-FRONTAL WARM SECTOR AS FAR NORTH
AS KS WITH DEWPOINTS IN THE 50S LIKELY FARTHER NORTH INTO THE UPPER
MS VALLEY. PLUME OF STEEP MID LEVEL LAPSE RATES WILL EXIST IN WARM
SECTOR ABOVE RETURNING MOIST AXIS. WHILE THIS WILL CONTRIBUTE TO
DESTABILIZATION...IT SHOULD SERVE TO EFFECTIVELY CAP MUCH OF THE
WARM SECTOR TO SURFACE BASED STORMS. MODERATE MLCAPE WILL BE
POSSIBLE ACROSS KS WHERE LOW CLOUDS MIX OUT...BUT WITH INSTABILITY
MORE MARGINAL WITH NWD EXTENT INTO THE UPPER MS VALLEY WHERE
MOISTURE WILL BE MORE LIMITED. A FEW ELEVATED STORMS WILL BE
POSSIBLE WITHIN WEAK WARM ADVECTION REGIME AHEAD OF THE FRONT OVER
THE UPPER MS VALLEY EARLY MONDAY. SOME HAIL MAY BE POSSIBLE WITH
THIS ACTIVITY. STRONGER STORMS MAY REDEVELOP DURING THE EVENING FROM
PARTS OF CNTRL KS SPREADING NEWD THROUGH ERN NEB AND IA AS FORCING
ASSOCIATED WITH EJECTING SHORTWAVE TROUGH ENHANCES LIFT...PRIMARILY
IN POST FRONTAL ZONE. MUCH OF THIS ACTIVITY WILL BE ELEVATED...BUT
EFFECTIVE SHEAR INCREASING TO AROUND 40 KT AND STEEP MID LEVEL LAPSE
RATES WILL SUPPORT A THREAT FOR LARGE HAIL. STORMS DEVELOPING CLOSER
TO THE SURFACE FRONT MAY ALSO BE CAPABLE OF PRODUCING STRONG WIND
GUSTS. A SLIGHT RISK MAY NEED TO BE REINTRODUCED ACROSS PARTS OF
THIS AREA ONCE HIGHER CONFIDENCE IS ESTABLISHED.

...OK AND TX...

RICHER LOW LEVEL MOISTURE WITH DEWPOINTS IN THE LOW TO MID 60S WILL
RETURN NWD BENEATH STEEP MID LEVEL LAPSE RATES. HOWEVER...THE MOIST
BOUNDARY LAYER WILL LIKELY REMAIN SHALLOW GIVEN FORECAST SWLY 850 MB
TRAJECTORIES. SWLY FLOW ALOFT WILL LIKELY MAINTAIN A WARM EML OVER
THE MOIST AXIS WITH A CAP EXPECTED DURING THE DAY. GIVEN THE DEEPER
ASCENT ASSOCIATED WITH EJECTING SHORTWAVE TROUGH EXPECTED TO REMAIN
NORTH OF THIS REGION AND POTENTIAL FOR A STRONG CAP...THUNDERSTORM
INITIATION ALONG THE DRYLINE IS EXPECTED TO REMAIN LIMITED.
THERMODYNAMIC AND KINEMATIC ENVIRONMENT WOULD SUPPORT SUPERCELLS IF
A STORM OR TWO MANAGED TO DEVELOP...THEREFORE HAVE INCLUDED
CONDITIONAL 5% SEVERE PROBABILITIES IN THIS REGION.

...MO AND AR...

WARM ADVECTION ASSOCIATED WITH THE MODEST SWLY LOW LEVEL JET MAY
CONTRIBUTE TO A FEW STORMS DEVELOPING IN THIS REGION OVERNIGHT. THE
THERMODYNAMIC ENVIRONMENT MAY SUPPORT A THREAT FOR HAIL WITH THE
STRONGER STORMS.

...ERN NC...

COLD AIR ALOFT WITH -20 AT 500 MB NEAR UPPER LOW CENTER MAY SUPPORT
A THREAT FOR MARGINALLY SEVERE HAIL WITH STORMS DEVELOPING DURING
THE AFTERNOON.

..DIAL.. 04/20/2008

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KEKA [200521]: Preliminary Local Storm Report...corrected 215 Pm Redwood Vly Locale

NWUS56 KEKA 200521 CCA
LSREKA

PRELIMINARY LOCAL STORM REPORT...CORRECTED 215 PM REDWOOD VLY LOCALE
NATIONAL WEATHER SERVICE EUREKA CA
758 PM PDT SAT APR 19 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1150 AM HAIL 4 W ETTERSBURG 40.12N 124.07W
04/19/2008 E0.25 INCH HUMBOLDT CA TRAINED SPOTTER

ELEVATION 1700 FEET. VERY LIGHT AND BRIEF HAIL SHOWER
WITH NO RAIN. TEMPERATURE 41.7 DEGREES

0215 PM NON-TSTM WND GST 10 N JUNCTION CITY 40.87N 123.05W
04/19/2008 E40 MPH TRINITY CA TRAINED SPOTTER

IN GRASSHOPPER FLAT AROUND CANYON CREEK. VERY GUSTY WINDS
AT 2900 FEET.

0215 PM HAIL REDWOOD VLY
04/19/2008 E0.25 INCH HUMBOLDT CA PUBLIC

JUST OFF HWY 299 NOT TOO FAR FROM BARRY SUMMIT. REPORTING
ELEVATION AT 1400 FEET.

0320 PM HAIL GASQUET 41.85N 123.97W
04/19/2008 E0.25 INCH DEL NORTE CA PUBLIC

SMALL HAIL NOT ACCUMULATING

0359 PM SNOW 1 S DEL LOMA 40.77N 123.33W
04/19/2008 U0.0 INCH TRINITY CA TRAINED SPOTTER

AT 1000 FEET, LIGHT SNOW. TEMPERATURE 36 DEGREES

0500 PM SNOW 10 N JUNCTION CITY 40.87N 123.05W
04/19/2008 U0.0 INCH TRINITY CA TRAINED SPOTTER

SPOTTER IN GRASSHOPPER FLATS. REPORT OF FLURRIES ONTOP OF
MONUMENT PEAK. TEMPERATURE FALLING RAPIDLY.

0600 PM HAIL 8 S MAPLE CREEK 40.65N 123.90W
04/19/2008 E0.25 INCH HUMBOLDT CA TRAINED SPOTTER

NEAR KNEELAND AT 2500 FEET. SLEET/HAIL SHOWERS.

0700 PM SNOW 4 W ETTERSBURG 40.12N 124.07W
04/19/2008 U0.0 INCH HUMBOLDT CA TRAINED SPOTTER

1700 FEET. TEMPERATURE 35.4 DEGREES.

0708 PM SNOW FOREST GLEN 40.38N 123.32W
04/19/2008 U0.0 INCH TRINITY CA TRAINED SPOTTER

AROUND 4000 FEET, SNOWING OFF/ON ALL DAY BUT IS NOW

STICKING. TEMPERATURE 32.9 DGREES. PRESSURE 29.83 INCHES.

0720 PM SNOW HONEYDEW 40.23N 124.12W
04/19/2008 U0.0 INCH HUMBOLDT CA PUBLIC

BETWEEN PETROLIA AND HONEYDEW OFF WILDER RIDGE
ROAD.ELEVATION 1500 FEET. 1 MILE EAST OF OCEAN AND NORTH
OF KINGS RANGE.

0725 PM SNOW BRICELAND 40.10N 123.90W
04/19/2008 U0.0 INCH HUMBOLDT CA TRAINED SPOTTER

ELKS RIDGE. LIGHT SNOW MELTING ON CONTACT. SNOW AT
SLIGHTLY HIGHER ELEVATION THEN HIS ELEVATION WHICH IS 850
FEET. TEMPERATURE 40 DEGREES.

0730 PM SLEET 10 N LAYTONVILLE 39.81N 123.48W
04/19/2008 E0.00 INCH MENDOCINO CA TRAINED SPOTTER

NE SIDE OF IRON PEAK AT 3800 FEET. SOME LIGHT SNOW MIXED.

&&

$$

ASHFORD

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DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 200508
SWODY1
SPC AC 200505

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1205 AM CDT SUN APR 20 2008

VALID 201200Z - 211200Z

...THERE IS A SLGT RISK OF SVR TSTMS PORTIONS VA/NC TIDEWATER AND
COASTAL PLAIN...

...SYNOPSIS...
IN MID-UPPER LEVELS...CONUS PORTION OF LARGE SCALE PATTERN WILL
CONTINUE TO FEATURE MEAN TROUGH OVER WRN STATES AND ERN MEAN RIDGE.
DEEP-LAYER CYCLONE...WITH MIDLEVEL CENTER INITIALLY ANALYZED OVER
ERN KY -- IS FCST TO PENETRATE PORTIONS OF ERN RIDGING IN EARLY
STAGES OF REX BLOCK EVOLUTION. IN DOING SO...LOW WILL REDEVELOP
GRADUALLY ESEWD-SEWD THROUGH PERIOD...EFFECTIVELY DRIFTING TO
POSITION OVER NRN OR ERN NC BY 21/12Z. SREF GUIDANCE AND
DETERMINISTIC/OPERATIONAL MODELS NOW PROVIDE STG CONSENSUS ON THIS
SCENARIO.

MEANWHILE...SERIES OF VORTICITY LOBES AND SMALL SCALE CIRCULATIONS
COMPRISE LARGE CYCLONIC GYRE NOW CENTERED OVER WRN WA. AS SMALLER
PERTURBATIONS MOVE THROUGH STG FLOW BELT AROUND THIS SYSTEM -- I.E.
90-100 KT 250 MB JET ACROSS NRN CA AND NRN GREAT BASIN -- EXPECT
HEIGHT FALLS ACROSS MOST OF NRN ROCKIES...MAINLY ASSOCIATED WITH EWD
MOTION OF SHORTWAVE TROUGH NOW OVER WRN ORE. LATTER PERTURBATION
SHOULD REACH NRN HIGH PLAINS BY 21/12Z. AT SFC...LEE-SIDE
CYCLOGENESIS ALREADY HAS OCCURRED OVER SERN MT. THIS LOW IS FCST TO
BIFURCATE NEAR BEGINNING OF PERIOD...NRN PORTION LIFTING INTO SERN
SASK AND SRN PORTION FOLLOWING SEGMENT OF SFC COLD FRONTAL ZONE SEWD
TO SWRN SD/NWRN NEB BY 21/00Z. FRONT SHOULD CONTINUE EWD ACROSS
MOST OF DAKOTAS BY 21/12Z...EXTENDING SSWWD ACROSS WRN KS AND TX
PANHANDLE.

...CAROLINAS/VA...
SCATTERED TO LOCALLY NUMEROUS TSTMS ARE EXPECTED TO DEVELOP MAINLY
IN CURVED BANDS...WITH GREATEST COVERAGE/INTENSITY DURING DIURNAL
WARM PERIOD OF MIDDAY THROUGH EARLY EVENING. HAIL PROBABILITIES
SHOULD BE RELATIVELY MAXIMIZED CLOSER TO COLD CORE REGION OF UPPER
LOW...LIMITING FACTOR BEING LIKELIHOOD OF WEAKER LOW LEVEL
CONTRIBUTION TO BUOYANCY BENEATH CLOUD/PRECIP AREAS. HAIL THREAT
APPEARS TOO CONDITIONAL/MRGL TO JUSTIFY CATEGORICAL OUTLOOK ON ITS
OWN.

BY CONTRAST...TORNADO POTENTIAL IS DISPLACED FARTHER E OVER AREA
GENERALLY ALONG/E OF I-95...IN ZONE OF MORE FAVORABLE BOUNDARY LAYER
THETAE. SEVERAL HOURS OF STG SFC HEATING MAY OCCUR OVER PORTIONS
ERN CAROLINAS AND PERHAPS SERN VA/SRN MD...AMIDST SELY SFC FLOW AND
BENEATH DEEP LAYER OF SLYS ALOFT. THIS KINEMATIC GEOMETRY WILL
DISPLACE LOW LEVEL HODOGRAPH LEFTWARD AND CURVE IT...RESULTING IN
FAVORABLE SRH VALUES FOR SUPERCELLS. PRIOR/ONGOING ACTIVITY MAY
LEAD TO NNE-SSW ALIGNED BOUNDARY WHICH WOULD SERVE BOTH AS
DIFFERENTIAL HEATING/DESTABILIZATION ZONE...AND AS POTENTIAL SOURCE
OF LOW LEVEL VORTICITY AND DEVIANT/RIGHTWARD STORM MOTION.
LONGEVITY OF DISCRETE TSTMS MAY BE LIMITED BY RELATIVELY WEAK
STORM-RELATIVE FLOW IN UPPER LEVELS AND LIKELY RELATED IMPACTS ON
STORM-SCALE PRECIP DISTRIBUTION. HOWEVER...MOIST LOW LEVEL PROFILES
AND LOW LCL ARE EXPECTED. THOUGH WITH COOLER TEMPS BOTH SFC AND
ALOFT...OVERALL SHAPE AND COMBINATION OF FCST
THERMODYNAMIC/KINEMATIC PROFILES RESEMBLES THAT OF DISSIPATING
TROPICAL CYCLONE ENVIRONMENTS IN THIS REGION. THEREFORE WILL
INTRODUCE SMALL AREA OF MRGL CATEGORICAL CRITERIA TORNADO
PROBABILITIES. UNCERTAINTIES REGARDING LONGEVITY OF FAVORABLE STORM
MODES...AND SMALL GEOGRAPHIC AREA AFFECTED...EACH PRECLUDES GREATER
PROBABILITIES ATTM.

...NRN PLAINS...
STRENGTHENING FRONTOGENETIC FORCING/LIFT FROM LATE AFTERNOON THROUGH
EVENING WILL RESULT IN INCREASING TSTM POTENTIAL OVER PORTIONS WRN
DAKOTAS. THIS ACTIVITY MAY BEGIN AS ELEVATED CONVECTION BEHIND
FRONT...OVERTAKING BAROCLINIC ZONE AT OR JUST ABOVE SFC THEN
INTENSIFYING FOR SEVERAL HOURS AFTER DARK. LIKELIHOOD OF
SIGNIFICANT NOCTURNAL COOLING/STABILIZATION OF NEAR SFC AIR WILL
LIMIT WIND THREAT SOMEWHAT AFTER ABOUT 03Z...THOUGH RESIDUAL/DRY
MIXED LAYER ABOVE SFC MAY COUNTERBALANCE THAT EFFECT FOR A FEW HOURS
IN SUPPORT OF GUST POTENTIAL. ISOLATED HAIL ALSO MAY OCCUR.

SIMILAR PATTERN TYPICALLY RESULTS IN CONSIDERABLY GREATER SVR
POTENTIAL IN ANOTHER MONTH OR TWO...WHEN MORE ACCESS TO BOTH
REGIONALLY GENERATED EVAPOTRANSPIRATIVE MOISTURE AND TRAJECTORIES OF
GULF ORIGIN MOISTURE WOULD BE LIKELY. BUT THAT LACK OF MOISTURE
WILL CONSTITUTE PRIMARY LIMITING FACTOR FOR SVR POTENTIAL ACROSS
THIS AREA TODAY AND TONIGHT. ANOTHER DETERRENT TO DIURNAL
CONVECTION WILL BE STG CAPPING...THOUGH SFC HEATING AND CONVERGENCE
MAY BE SUFFICIENT TO FORM ISOLATED ACTIVITY BEFORE DARK INVOF SFC
LOW.

..EDWARDS/GRAMS.. 04/20/2008

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KCHS [200500]: Preliminary Local Storm Report

NWUS52 KCHS 200500
LSRCHS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1259 AM EDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1156 AM HAIL CHARLESTON AIRPORT 32.90N 80.04W
04/19/2008 M0.25 INCH CHARLESTON SC OFFICIAL NWS OBS

1/4 INCH HAIL FELL AT THE CHARLESTON INTERNATIONAL
AIRPORT FAA TOWER.

&&

$$

SBT

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KVEF [200449]: Preliminary Local Storm Report

NWUS55 KVEF 200449
LSRVEF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
948 PM PDT SAT APR 19 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

0330 PM NON-TSTM WND GST 5 E NEW KINGMAN-BUTLER 35.26N 113.93W
04/19/2008 M45 MPH MOHAVE AZ ASOS

&&

$$

KLABELLE

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KCHS [200400]: Preliminary Local Storm Report

NWUS52 KCHS 200400
LSRCHS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1200 AM EDT SUN APR 20 2008

..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..

1158 PM HAIL HANAHAN 32.92N 80.02W
04/19/2008 E0.25 INCH CHARLESTON SC PUBLIC

&&

$$

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