MD 1491 CONCERNING SEVERE THUNDERSTORM WATCH 438… FOR SRN KS/NRN OK
MESOSCALE DISCUSSION 1491 NWS STORM PREDICTION CENTER NORMAN OK 0744 PM CDT TUE JUL 23 2013 AREAS AFFECTED...SRN KS/NRN OK CONCERNING...SEVERE THUNDERSTORM WATCH 438... VALID 240044Z - 240145Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 438 CONTINUES. SUMMARY...VERY LARGE HAIL AND DAMAGING WINDS ARE EXPECTED WITH CONVECTION AS IT SPREADS FROM NORTH TO SOUTH ACROSS KS INTO OK. DISCUSSION...TWO MAIN CLUSTERS OF SEVERE THUNDERSTORMS HAVE EVOLVED ACROSS KS THIS EVENING. THE NRN MOST CLUSTER INITIATED NORTH OF A WELL DEFINED SFC BOUNDARY WITHIN WEAK WARM ADVECTION BUT HAS NOW EXPANDED IN AREAL COVERAGE AND LEADING EDGE IS ACCELERATING SWD AT ROUGHLY 30KT NEAR HUT. CONSIDERABLE AMOUNT OF CONVECTION HAS BECOME ORIENTED N-S FROM NW OF SLN...SWD TO NEAR HUT WHICH MAY ULTIMATELY ENHANCE SWD MOVEMENT AS PRECIP SHIELD BEGINS TO EXPAND AND POSSIBLY FORM A COLD POOL. A MUCH SLOWER AND MORE ISOLATED STORM HAS DEVELOPED JUST SE OF DDC WHERE INTENSE SFC HEATING COINCIDED WITH ENHANCED LOW LEVEL CONVERGENCE NEAR SFC LOW. THIS STORM IS GRADUALLY EXPANDING AND IS EXPECTED TO PROPAGATE SWD INTO NWRN OK IN THE NEXT FEW HOURS. VERY LARGE HAIL AND DAMAGING OUTFLOW MAY ACCOMPANY EACH OF THESE CLUSTERS. ..DARROW.. 07/24/2013 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SGF...TSA...ICT...OUN...GID...DDC... LAT...LON 39429953 37419474 34669474 36679954 39429953
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