THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF NORTHERN AND CENTRAL NEBRASKA SOUTH-CENTRAL SOUTH DAKOTA * EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 125 PM UNTIL 1000 PM CDT. * PRIMARY THREATS INCLUDE... SEVERAL TORNADOES POSSIBLE SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER LIKELY SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH NORTHWEST OF VALENTINE NEBRASKA TO 5 MILES EAST SOUTHEAST OF KEARNEY NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4). 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...RAPID TSTM DEVELOPMENT IS UNDERWAY ACROSS S-CNTRL SD WITH ADDITIONAL STORM FORMATION ANTICIPATED THIS AFTERNOON FARTHER TO THE SOUTH IN NEBRASKA. THE AMBIENT ENVIRONMENT IS CHARACTERIZED BY MODERATE TO STRONG INSTABILITY /MLCAPE OF 2000-3000+ J PER KG/ AND RATHER STRONG DEEP-LAYER SHEAR. AS SUCH...THE SETUP IS VERY FAVORABLE FOR SUPERCELLS CAPABLE OF VERY LARGE HAIL AND A FEW TORNADOES. UPSCALE GROWTH OF STORMS INTO A SEWD-MOVING BOW/MCS IS EXPECTED TO OCCUR WITH AN ASSOCIATED WIND AND HAIL THREAT CONTINUING THROUGH THIS EVENING. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 32020. ...MEAD -SWC-
Posted on: Thu, 01 Aug 2013 18:27:13 +0000
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