THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF UPPER MICHIGAN NORTHERN WISCONSIN LAKE SUPERIOR * EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 635 PM UNTIL 100 AM CDT. * PRIMARY THREATS INCLUDE... SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE A FEW TORNADOES POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES SOUTH OF DULUTH MINNESOTA TO 55 MILES SOUTHEAST OF IRON MOUNTAIN MICHIGAN. 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. && OTHER WATCH INFORMATION...CONTINUE...WW 443...WW 444...WW 445... DISCUSSION...TSTMS EXPECTED TO CONTINUE FORMING ALONG FRONT STALLED ROUGHLY ALONG THE NRN WI/UPR MI BORDER AS FAIRLY STRONG FORCING FOR ASCENT ASSOCIATED WITH NRN MN UPR IMPULSE SWEEPS ESEWD. OTHER STORMS MAY FORM IN NE MN/NW WI ALONG THE SFC COLD FRONT PRECEDING THE UPR IMPULSE. COOL AIR ALOFT AND ENHANCED LOW TO MID-LVL SHEAR NEAR FRONT SUGGEST POTENTIAL FOR SUPERCELLS WITH A RISK FOR SVR HAIL AND POSSIBLY A TORNADO. FARTHER S IN WI...IN THE AREA W OF GRB...ADDITIONAL STORMS MAY FORM DURING THE NEXT COUPLE HOURS IN AREA OF WAA/MOISTURE TRANSPORT ASSOCIATED WITH STRENGTHENING LOW-LVL JET STREAM. THIS ACTIVITY SHOULD BE MORE DIURNAL THAN ACTIVITY FARTHER N...BUT MAY BE CAPABLE OF SVR HAIL. 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 450. MEAN STORM MOTION VECTOR 30025. ...CORFIDI -SWC-
Posted on: Thu, 25 Jul 2013 23:40:42 +0000
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