SPC Tornado Watch 656
Mon, 13 Sep 2010 14:44:03 -0500
URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 656 NWS STORM PREDICTION CENTER NORMAN OK 240 PM CDT MON SEP 13 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHWEST IOWA NORTHERN KANSAS SOUTHERN AND CENTRAL NEBRASKA EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 240 PM UNTIL 1100 PM CDT. TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES NORTH NORTHWEST OF MCCOOK NEBRASKA TO 15 MILES EAST NORTHEAST OF FALLS CITY NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). 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. OTHER WATCH INFORMATION...CONTINUE...WW 655... DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN NUMBER AND INTENSITY THIS AFTERNOON AND EVENING FROM THE VICINITY OF A SURFACE LOW NW OF HLC EWD ALONG EITHER SIDE OF A STATIONARY BOUNDARY SITUATED NEAR THE NEB/KS BORDER. THE COMBINATION OF BOUNDARY LAYER DEWPOINTS IN THE MID 60S TO LOWER 70S AND STEEP MIDLEVEL LAPSE RATES IS YIELDING A MODERATE TO STRONGLY UNSTABLE AIR MASS WITH MLCAPE OF 2000-3000+ J/KG AND A WEAKENING CAP. DEEP-LAYER SHEAR IS ALREADY SUPPORTIVE OF SUPERCELLS AND AS A SLY LLJ INCREASES TO 30+ KT TOWARD 14/00Z...LOW-LEVEL SHEAR WILL ACCORDING STRENGTHEN. AS SUCH...THE INITIAL HAZARDS WILL BE LARGE HAIL AND DAMAGING WINDS. HOWEVER...THE POTENTIAL FOR A FEW TORNADOES WILL INCREASE BY LATE AFTERNOON THROUGH THIS EVENING. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 29025. ...MEADRead more
SPC Tornado Watch 656 Status Reports
Mon, 13 Sep 2010 14:44:12 -0500
STATUS FOR WATCH 0656 HAS NOT BEEN ISSUED YETRead more
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