SPC 0600Z Day 2 Outlook
DAY 2 CONVECTIVE OUTLOOK NWS STORM PREDICTION CENTER NORMAN OK 1259 AM CDT THU SEP 27 2012 VALID 281200Z - 291200Z ...NO SVR TSTM AREAS FORECAST... ...SYNOPSIS... THE PERSISTENT/W-E SURFACE COLD FRONT OVER THE ERN 2/3 OF THE U.S. THE PAST COUPLE OF DAYS IS FORECAST TO DRIFT SEWD THIS PERIOD...AS AN ERN CANADA UPPER LOW/TROUGH DIGS SEWD TOWARD THE NERN U.S. WITH TIME. THIS FRONT WILL CONTINUE TO SERVE AS A ZONE OF FOCUS FOR WIDESPREAD SHOWERS AND THUNDERSTORMS. ELSEWHERE...A WEAK FLOW FIELD ALOFT WITH EMBEDDED MINOR DISTURBANCES WILL PREVAIL OVER THE WRN 2/3 OF THE COUNTRY. TWO OF THE STRONGER OF THESE FEATURES -- ONE CROSSING THE NRN INTERMOUNTAIN REGION AND THE OTHER SHIFTING ACROSS THE SRN HIGH PLAINS -- WILL SUPPORT CONVECTION ACROSS A LARGE PORTION OF THE ROCKIES AND INTO THE SRN PLAINS. ...MID-ATLANTIC REGION SWWD INTO WRN TN... COMBINATION OF MODEST INSTABILITY AND LIMITED SHEAR IS FORECAST FROM THE MID-ATLANTIC REGION WSWWD ALONG THE WEAK SURFACE FRONT EXTENDING INTO THE SRN APPALACHIANS. THIS WILL LARGELY HINDER STRONGER STORM DEVELOPMENT WITHIN THE ZONE OF CONVECTION FORECAST TO PERSIST FOR MUCH OF THE PERIOD ACROSS THIS REGION. ANY SEVERE RISK SHOULD REMAIN VERY ISOLATED...WITH A MARGINAL HAILSTONE/LOCALLY ENHANCED GUST OR TWO DURING THE AFTERNOON APPEARING LIKELY ATTM TO BE THE EXTENT OF THE THREAT. ...SERN CO/SWRN KS AND THE TX/OK PANHANDLES EWD TO WRN AR... WIDESPREAD SHOWERS AND STORMS ARE FORECAST ACROSS OK AND ADJACENT PORTIONS OF SURROUNDING STATES THIS PERIOD...NEAR THE W-E SURFACE FRONT PROGGED TO LIE VIRTUALLY STATIONARY THROUGH THE PERIOD. WHILE LARGE-SCALE ASCENT WILL BE AIDED BY AN UPPER SHORT-WAVE TROUGH CROSSING THE AREA...WEAK INSTABILITY AND ONLY MODEST SHEAR SUGGESTS ONLY AN ISOLATED/LOW-END THREAT FOR HAIL/WIND -- MAINLY DURING THE AFTERNOON AND EVENING HOURS. ..GOSS.. 09/27/2012
via SPC Forecast Products http://www.spc.noaa.gov/products/outlook/day2otlk_0600.html
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