THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHERN AND EASTERN IOWA SOUTHEASTERN MINNESOTA WESTERN AND SOUTHERN WISCONSIN * EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 745 PM UNTIL 200 AM CDT. * PRIMARY THREATS INCLUDE... ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 115 STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF LA CROSSE WISCONSIN TO 30 MILES WEST SOUTHWEST OF WATERLOO IOWA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). 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...TSTMS EXPECTED TO PERSIST AND POSSIBLE INCREASE THROUGH LATE EVE AHEAD OF SHORTWAVE TROUGH PIVOTING SE ACROSS REGION IN CYCLONIC WNWLY MID/UPR LVL FLOW /REF MCD 1577/. STORMS MAY FOCUS IN TWO AREAS.../1/ ALONG/AHEAD OF WEAK COLD FRONT NOW ENTERING SW MN AND FAR NW IA...AND /2/ ALONG SW-NE LOW-LVL CONFLUENCE AXIS OVER NE IA/SW WI. AMPLE DEEP WNWLY SHEAR WILL BE PRESENT FOR STORM ORGANIZATION AND SUSTENANCE...AND A CONDITIONAL RISK FOR SVR HAIL/WIND...GIVEN SUFFICIENT LOW-LVL CONVERGENCE TO FORCE PARCELS TO THEIR FCS. 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 28030. ...CORFIDI
Posted on: Tue, 19 Aug 2014 00:54:47 +0000
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