Severe Thunderstorm Watch 237

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 237
NWS STORM PREDICTION CENTER NORMAN OK
715 PM CDT FRI APR 25 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND NORTHEAST ILLINOIS
EXTREME NORTHWEST INDIANA
EAST CENTRAL MISSOURI
LAKE MICHIGAN
EFFECTIVE THIS FRIDAY EVENING FROM 715 PM UNTIL 1000 PM 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 40
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST
NORTHWEST OF VALPARAISO INDIANA TO 20 MILES EAST SOUTHEAST OF
FARMINGTON MISSOURI. FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).
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 231
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WW 232
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WW
233
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WW 234
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WW 235
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DISCUSSION...BROKEN LINE OF STORMS ALONG A COLD FRONT WILL SPREAD
EWD ACROSS ERN MO AND CENTRAL/NE IL THE NEXT FEW HOURS. INSTABILITY
AND VERTICAL SHEAR WILL BE SUFFICIENT FOR A CONTINUED DAMAGING WIND
AND LARGE HAIL THREAT...BEFORE THE LOW LEVELS STABILIZE AND THE
THREAT ENDS BY ABOUT 03Z.
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 25030.
...THOMPSON