WATCHES: Severe Thunderstorm Watch Number 746

WWUS20 KWNS 280251
SEL6
SPC WW 280251
INZ000-MIZ000-OHZ000-LEZ000-LHZ000-LMZ000-281000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 746
NWS STORM PREDICTION CENTER NORMAN OK
1045 PM EDT SUN SEP 27 2009

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

NORTHERN INDIANA
SOUTHERN AND CENTRAL MICHIGAN
NORTHWEST OHIO
LAKE ERIE
LAKE HURON
LAKE MICHIGAN

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1045 PM UNTIL
600 AM EDT.

HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 95
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTHWEST OF
FORT WAYNE INDIANA TO 35 MILES WEST NORTHWEST OF SAGINAW
MICHIGAN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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 745...

DISCUSSION...TSTMS NOW FORMING ALONG STRENGTHENING COLD FRONT OVER
ERN WI/NRN IL EXPECTED TO FUSE INTO A NEARLY SOLID LINE AS UPR VORT
NOW NEAR MSP AMPLIFIES SEWD. ALTHOUGH SFC-BASED INSTABILITY WILL
REMAIN LIMITED GIVEN TIME OF DAY AND UPSTREAM MOISTURE ENVIRONMENT
...STRENGTH OF DEEP WIND FIELD...INCREASING LARGE SCALE ASCENT...AND
FRONTAL UPLIFT TOGETHER EXPECTED TO SUPPORT A LINE OF STG TO SVR
CONVECTION/STORMS. EMBEDDED SUPERCELLS/BOWING STRUCTURES COULD
YIELD DMGG WIND...MARGINALLY SVR HAIL...AND PERHAPS A TORNADO IN
LEFT EXIT REGION OF 100+ KT 500 MB JET STREAK.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM
MOTION VECTOR 26050.

...CORFIDI

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