TORNADO WATCH NUMBER 313 NWS STORM PREDICTION CENTER NORMAN OK 340 PM CDT FRI JUN 14 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF EXTREME WESTERN IOWA EASTERN NEBRASKA * EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 340 PM UNTIL 1000 PM CDT. * PRIMARY THREATS INCLUDE... SEVERAL TORNADOES POSSIBLE SEVERAL VERY LARGE HAIL EVENTS TO 2.5 INCHES IN DIAMETER POSSIBLE SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF NORFOLK NEBRASKA TO 25 MILES SOUTHEAST OF LINCOLN NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3). 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. && OTHER WATCH INFORMATION...CONTINUE...WW 312... DISCUSSION...THUNDERSTORMS IN S CENTRAL NEB WILL CONTINUE TO SPREAD NEWD TOWARD NE NEB THIS AFTERNOON...WHERE ADDITIONAL SURFACE-BASED DEVELOPMENT WILL BE POSSIBLE NEAR THE TRIPLE POINT. THE ENVIRONMENT FROM THE TRIPLE POINT SEWD ACROSS ERN NEB IS CHARACTERIZED BY BOUNDARY LAYER DEWPOINTS NEAR 70 F AND SURFACE TEMPERATURES APPROACHING 90 F FROM THE SW...WHICH WILL CONTINUE TO WEAKEN CONVECTIVE INHIBITION AND SUPPORT NEW STORM DEVELOPMENT. MEANWHILE...THE OAX VWP SHOWS A RELATIVELY LARGE CLOCKWISE TURNING HODOGRAPH...WITH SUFFICIENT VERTICAL SHEAR FOR SUPERCELLS. GIVEN EFFECTIVE SRH NEAR 300 M2/S2...MLCAPE OF 3000-4000 J/KG...AND MLLCL HEIGHTS NEAR 1250 M...A FEW TORNADOES AND ISOLATED VERY LARGE HAIL WILL BE POSSIBLE WITH THE INITIALLY MORE DISCRETE STORMS. LATER THIS EVENING...SOME UPSCALE GROWTH IS EXPECTED INTO A SMALL SEWD-MOVING MCS...WITH AN ATTENDANT RISK FOR DAMAGING GUSTS. 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 550. MEAN STORM MOTION VECTOR 27020. ...THOMPSON ====================================================================== 131 WWUS40 KWNS 142043 WWP3 TORNADO WATCH PROBABILITIES FOR WT 0313 NWS STORM PREDICTION CENTER NORMAN OK 0336 PM CDT FRI JUN 14 2013 WT 0313 PROBABILITY TABLE: PROB OF 2 OR MORE TORNADOES : 50% PROB OF 1 OR MORE STRONG /F2-F5/ TORNADOES : 20% PROB OF 10 OR MORE SEVERE WIND EVENTS : 30% PROB OF 1 OR MORE WIND EVENTS >= 65 KNOTS : 20% PROB OF 10 OR MORE SEVERE HAIL EVENTS : 50% PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 40% PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 80% && ATTRIBUTE TABLE: MAX HAIL /INCHES/ : 2.5 MAX WIND GUSTS SURFACE /KNOTS/ : 60 MAX TOPS /X 100 FEET/ : 550 MEAN STORM MOTION VECTOR /DEGREES AND KNOTS/ : 27020 PARTICULARLY DANGEROUS SITUATION : NO && FOR A COMPLETE GEOGRAPHICAL DEPICTION OF THE WATCH AND WATCH EXPIRATION INFORMATION SEE WOUS64 FOR WOU3.
Posted on: Fri, 14 Jun 2013 22:43:10 +0000
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