SPC Tornado Watch 660
Tue, 14 Sep 2010 19:00:04 -0500
URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 660 NWS STORM PREDICTION CENTER NORMAN OK 525 PM MDT TUE SEP 14 2010 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF WESTERN AND NORTHERN NEBRASKA SOUTHWEST AND SOUTH CENTRAL SOUTH DAKOTA EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 525 PM UNTIL 100 AM MDT. TORNADOES...HAIL TO 2 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 80 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 90 MILES WEST NORTHWEST OF MULLEN NEBRASKA TO 50 MILES NORTH NORTHEAST OF ONEILL NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0). 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...SCTD AREAS OF TSTMS EXPECTED TO MOVE/DEVELOP ENE ACROSS WW AREA THOUGH EARLY WED AS WAA AND UPR LVL DIVERGENCE INCREASE DOWNSTREAM FROM ERN WY/NRN CO UPR IMPULSE. DEEP SHEAR AND INSTABILITY SHOULD REMAIN FAVORABLE FOR SUPERCELLS THROUGH LATE TONIGHT...WITH WITH MODERATE STRENGTHENING OF SLY LLJ CONTRIBUTING TO ENHANCED LOW LVL SHEAR. INCREASING CIN AFTER SUNSET MAY RESULT IN MOST STORMS BEING SLIGHTLY ELEVATED. BUT COMBINATION OF FAIRLY RICH MOISTURE WITH INCREASING ASCENT AND LOW LVL SHEAR ALONG STALLED FRONT ON THE NEB/SD BORDER SUGGESTS A NON-ZERO RISK FOR TORNADOES...IN ADDITION TO SVR WIND/HAIL. AVIATION...TORNADOES AND 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 550. MEAN STORM MOTION VECTOR 26025. ...CORFIDIRead more
SPC Tornado Watch 660 Status Reports
Tue, 14 Sep 2010 19:00:06 -0500
STATUS FOR WATCH 0660 HAS NOT BEEN ISSUED YETRead more
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