Severe Thunderstorm Watch 238

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 238
NWS STORM PREDICTION CENTER NORMAN OK
835 PM EDT FRI APR 25 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHWEST LOWER MICHIGAN
LAKE MICHIGAN
EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 835 PM
UNTIL 100 AM EDT.
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 15 MILES WEST
NORTHWEST OF PELLSTON MICHIGAN TO 25 MILES SOUTHWEST OF ROBEN
HOOD MICHIGAN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
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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WW 237
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DISCUSSION...CONVECTION WILL CROSS LAKE MI AND OVERSPREAD NW LOWER
MI THE NEXT FEW HOURS IN ADVANCE OF A MID LEVEL TROUGH AND SURFACE
COLD FRONT MOVING EWD OVER WI. RELATIVELY STEEP MID LEVEL LAPSE
RATES AND EFFECTIVE BULK SHEAR IN EXCESS OF 40 KT WILL SUPPORT A
THREAT FOR ORGANIZED STORMS CAPABLE OF PRODUCING LARGE HAIL AND
DAMAGING GUSTS.
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 24035.
...THOMPSON