WW 231 TORNADO KS NE 272150Z – 280500Z
URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 231 NWS STORM PREDICTION CENTER NORMAN OK 450 PM CDT MON MAY 27 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF NORTHERN KANSAS SOUTHERN NEBRASKA * EFFECTIVE THIS MONDAY AFTERNOON FROM 450 PM UNTIL MIDNIGHT CDT. * PRIMARY THREATS INCLUDE... NUMEROUS TORNADOES LIKELY WITH SEVERAL INTENSE TORNADOES POSSIBLE NUMEROUS VERY LARGE HAIL EVENTS TO 4 INCHES IN DIAMETER LIKELY SEVERAL SIGNIFICANT DAMAGING WIND GUSTS TO 80 MPH POSSIBLE THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 120 STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF HASTINGS NEBRASKA TO 55 MILES SOUTHWEST OF CONCORDIA KANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1). 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 227...WW 228...WW 229...WW 230... DISCUSSION...RAPID SUPERCELL DEVELOPMENT IS UNDERWAY IN A ZONE OF LOW-LEVEL WAA ACROSS S CENTRAL NEB...AND ADDITIONAL SUPERCELLS SHOULD FORM JUST NE OF THE TRIPLE POINT IN N CENTRAL KS WHERE LOW-LEVEL CONVERGENCE IS MAXIMIZED ALONG THE INSTABILITY AXIS...AS CONVECTIVE INHIBITION WEAKENS. THE COMBINATION OF MLCAPE OF 3500-4500 J/KG...EFFECTIVE BULK SHEAR OF 40-50 KT...EFFECTIVE SRH OF 250-400 M2/S2...AND BOUNDARY LAYER DEWPOINTS IN THE UPPER 60S WILL SUPPORT THE RISK OF A FEW STRONG TORNADOES AND VERY LARGE HAIL. LATER THIS EVENING INTO TONIGHT...THE STORMS WILL LIKELY CONGEAL INTO AN MCS AND MOVE EWD/ESEWD ALONG THE RESIDUAL OUTFLOW/WARM FRONT INTO NE KS/SE NEB. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR 27020. ...THOMPSON
via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0231.html
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