WW 218 SEVERE TSTM KS NE 252210Z – 260400Z
URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 218 NWS STORM PREDICTION CENTER NORMAN OK 510 PM CDT SAT MAY 25 2013 THE NWS STORM PREDICTION CENTER HAS ISSUED A * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF WESTERN KANSAS EXTREME SOUTHWEST NEBRASKA * EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 510 PM UNTIL 1100 PM CDT. * PRIMARY THREATS INCLUDE... A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF MCCOOK NEBRASKA TO 10 MILES WEST SOUTHWEST OF LIBERAL KANSAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. && OTHER WATCH INFORMATION...CONTINUE...WW 217... DISCUSSION...HIGH-BASED STORMS FORMING ALONG THE DRYLINE WILL SPREAD SLOWLY EWD THROUGH THIS EVENING...WITH LARGE HAIL THE PRIMARY RISK IN AN ENVIRONMENT OF MODERATE INSTABILITY/STEEP LAPSE RATES...AND EFFECTIVE BULK SHEAR OF 25-30 KT. LATER THIS EVENING...STORM MERGERS COULD LEAD TO SOME UPSCALE GROWTH INTO ONE OR MORE CLUSTERS...WITH AN ATTENDANT RISK FOR STRONG/DAMAGING OUTFLOW WINDS BEFORE THE BOUNDARY LAYER STABILIZES TONIGHT. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 27020. ...THOMPSON
via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0218.html
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