ZCZC SPCSWODY1 ALL ACUS01 KWNS 291553 SPC AC 291551 STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS. VALID 291630Z - 301200Z NO SVR TSTM AREAS FCST. GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 20 NE GLS 40 WNW POE 50 WSW MLU 45 NNW GWO 15 NNE UOX 45 SE MKL 45 SW BNA 25 ENE CSV 15 ESE TRI 35 W GSO 25 SSE GSO 10 NNW SOP 15 WSW FLO AGS 30 NE MCN 35 SW CSG 30 ESE GPT. PROGRESSIVE BROAD UPPER TROUGH SHIFTS EWD ACROSS CENTRAL U.S. THIS FORECAST PERIOD. ONLY WEAK S/WV TROUGHS ROTATING THRU THE LARGE SCALE TROUGH WITH ONE CURRENTLY CROSSING CENTRAL APPALACHIANS AND ANOTHER DROPPING ESEWD ACROSS N CENTRAL STATES INTO OH VALLEY. COLD FRONT EXTENDING FROM ERN KY WSWWD INTO CENTRAL AR AND NRN TX WILL CONTINUE PUSHING SEWD INTO GULF COAST STATES BY TONIGHT. SWLY FLOW AHEAD OF COLD FRONT WITH VERY MOIST AIRMASS PRECEDING FRONT INTO LOWER MS VALLEY. WITH EXTENSIVE COLD COVER AND WEAK LAPSE RATES...ONLY MARGINAL INSTABILITY AVAILABLE TO SUPPORT CONVECTION. WILL CONTINUE AN AREA OF THUNDERSTORM POTENTIAL AHEAD OF COLD FRONT...HOWEVER COVERAGE EXPECTED TO BE VERY LIMITED GIVEN THE LACK OF FAVORABLE THERMODYNAMICS. ..HALES.. 01/29/03 NNNN |