WATCHES: Severe Thunderstorm Watch Number 591

WWUS20 KWNS 082333
SEL1
SPC WW 082333
MNZ000-WIZ000-090700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 591
NWS STORM PREDICTION CENTER NORMAN OK
630 PM CDT SUN AUG 8 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTHERN MINNESOTA
WEST CENTRAL AND NORTHWEST WISCONSIN

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 630 PM UNTIL
200 AM CDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES NORTH
NORTHWEST OF REDWOOD FALLS MINNESOTA TO 55 MILES EAST OF EAU
CLAIRE WISCONSIN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 587...WW 588...WW
589...WW 590...

DISCUSSION...TSTMS HAVE FORMED RECENTLY ALONG WEAK W/E BOUNDARY N OF
THE MSP AREA. OTHER STORMS HAVE AT THE SAME TIME DEVELOPED IN AREA
OF ELEVATED INSTABILITY IN SW MN. ALL OF THE ACTIVITY LIKELY IS
BEING ENHANCED BY PASSING UPR LVL IMPULSE /PER WATER VAPOR
IMAGERY/... AND...IN ERN MN...BY SFC HEATING. LOW LVL WINDS ARE
EXPECTED TO REMAIN WEAK/DISORGANIZED. BUT PRESENCE OF HI PW WITH
MODERATE TO SEASONABLY STRONG DEEP WNWLY SHEAR /PER VWP AND PROFILER
DATA/ MAY SUPPORT ESE-PROPAGATING BOWING SEGMENTS WITH LOCALLY DMGG
WIND.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29025.

...CORFIDI

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