DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 270600
SWODY2
SPC AC 270559

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

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