TORNADO WATCH 298 PDS!!!! marie SEL8 URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 298 NWS STORM PREDICTION CENTER NORMAN OK 150 PM CDT WED JUN 12 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF NORTHEAST IOWA NORTHERN ILLINOIS EXTREME SOUTHEAST MINNESOTA SOUTHWEST WISCONSIN * EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 150 PM UNTIL 900 PM CDT. ...THIS IS A PARTICULARLY DANGEROUS SITUATION... * PRIMARY THREATS INCLUDE... SEVERAL INTENSE TORNADOES LIKELY SEVERAL SIGNIFICANT DAMAGING WIND GUSTS TO 80 MPH POSSIBLE SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE MILES EITHER SIDE OF A LINE FROM 35 MILES WEST SOUTHWEST OF MASON CITY IOWA TO 20 MILES EAST SOUTHEAST OF ROCKFORD ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND 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. && DISCUSSION...POTENTIALLY EXPLOSIVE THUNDERSTORM DEVELOPMENT IS POSSIBLE OVER THE NEXT FEW HOURS AS GRADUALLY DEEPENING SURFACE LOW TRACKS EAST ALONG A FRONTAL ZONE SITUATED FROM NORTHEAST IOWA EASTWARD ALONG THE WI/IL BORDER TO LAKE MICHIGAN. A VOLATILE WARM AND VERY MOIST AIRMASS SHOULD FUEL INTENSE THUNDERSTORM UPDRAFTS ACROSS THESE AREAS WHERE MID LEVEL FLOW IN EXCESS AROUND 50KT SUPPORTS UPDRAFT PERSISTENCE AND ORGANIZATION. A NUMBER OF SUPERCELLS ARE EXPECTED PRIOR TO A CONSOLIDATION OF STORMS INTO A LARGE MCS TOWARD EVENING. LOW LEVEL SHEAR/HELICITY NEAR THE SURFACE LOW AND ALONG THE FRONT WILL SUPPORT SOME TORNADOES WITH ANY DISCRETE CELLS. A COUPLE STRONG TORNADOES SEEM POSSIBLE WITHIN THIS ENVIRONMENT OVER THE NEXT SEVERAL HOURS IN ADDITION TO VERY LARGE HAIL AND LOCALIZED DOWNDRAFT/DAMAGING WIND THREATS. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 28030.
Posted on: Wed, 12 Jun 2013 19:56:55 +0000
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