SPC Severe Thunderstorm Watch 671
Fri, 17 Sep 2010 23:15:03 -0500
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 671 NWS STORM PREDICTION CENTER NORMAN OK 1115 PM CDT FRI SEP 17 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF WEST CENTRAL IOWA CENTRAL AND EAST CENTRAL NEBRASKA EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1115 PM UNTIL 600 AM CDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST NORTHWEST OF BROKEN BOW NEBRASKA TO 10 MILES EAST NORTHEAST OF DES MOINES IOWA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1). 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...LOW-MIDLEVEL FRONTOGENESIS AND WAA N OF A SURFACE COLD FRONT WILL SUPPORT AN INCREASE IN ELEVATED CONVECTION IN AN E-W BAND FROM CENTRAL NEB INTO WRN IA. A RESERVOIR OF MODERATE MUCAPE AND STEEP MIDLEVEL LAPSE RATES WILL SUPPORT STRONG UPDRAFTS...AND A FEW ORGANIZED/SUPERCELL STORMS WILL BE POSSIBLE GIVEN 40+ KT EFFECTIVE BULK SHEAR. LARGE HAIL SHOULD BE THE PRIMARY SEVERE STORM THREAT THROUGH THE OVERNIGHT HOURS. 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 28025. ...THOMPSONRead more
SPC Severe Thunderstorm Watch 671 Status Reports
Fri, 17 Sep 2010 23:15:11 -0500
STATUS FOR WATCH 0671 HAS NOT BEEN ISSUED YETRead more
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