THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN IOWA SOUTHERN MINNESOTA SOUTHWEST WISCONSIN * EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 140 PM UNTIL 900 PM CDT. * PRIMARY THREATS INCLUDE... SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST NORTHWEST OF STORM LAKE IOWA TO 40 MILES EAST SOUTHEAST OF LA CROSSE WISCONSIN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && DISCUSSION...THUNDERSTORMS WILL INCREASE IN COVERAGE/INTENSITY THROUGH THE AFTERNOON ACROSS SRN MN/NRN IA/SW WI IN A ZONE OF MODERATE INSTABILITY AND ENOUGH VERTICAL WIND SHEAR FOR ORGANIZED/SUPERCELL STORMS. THE STRONGEST STORMS WILL POSE A RISK FOR LARGE HAIL AND DAMAGING GUSTS THROUGH LATE AFTERNOON/EVENING. 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 31025. ...THOMPSON -SWC-
Posted on: Thu, 25 Jul 2013 18:39:40 +0000
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