THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHWESTERN MINNESOTA NORTHEASTERN NORTH DAKOTA * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 115 PM UNTIL 800 PM CDT. * PRIMARY THREATS INCLUDE... SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 110 STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHWEST OF HALLOCK MINNESOTA TO 60 MILES SOUTH OF DEVILS LAKE NORTH DAKOTA. 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...STORMS ARE EXPECTED TO INCREASE IN COVERAGE AND INTENSITY FROM NORTHEASTERN NORTH DAKOTA INTO NORTHWESTERN MINNESOTA ALONG AND OUTFLOW BOUNDARY AND PRE-FRONTAL CONFLUENCE ZONE. MODERATE-STRONG INSTABILITY WITH MLCAPE FROM 2000-3000 J/KG AND 25-35 KT EFFECTIVE SHEAR WILL SUPPORT BOTH MULTICELL AND SOME SUPERCELL STRUCTURES WITH ACTIVITY POSSIBLY EVOLVING INTO CLUSTERS/LINES THIS EVENING. DAMAGING WIND AND LARGE HAIL WILL BE THE MAIN THREATS. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 25025. ...DIAL -SWC-
Posted on: Sat, 24 Aug 2013 18:16:09 +0000
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