DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 220540
SWODY2
SPC AC 220539

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1239 AM CDT SAT SEP 22 2012

VALID 231200Z - 241200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
A LARGE ERN NOAM TROUGH WILL CONTINUE DRIFTING SLOWLY EWD THIS
PERIOD...WHILE THE ASSOCIATED SURFACE COLD FRONT -- ALREADY OFF THE
U.S. EAST COAST WITH THE EXCEPTION OF FL -- CONTINUES EWD INTO THE
ATLANTIC AND SWD ACROSS THE FL PENINSULA WITH TIME. IN THE WAKE OF
THIS FRONT...A LARGE AREA OF HIGH PRESSURE IS FORECAST TO PREVAIL E
OF THE ROCKIES.

FARTHER W...A SMALL UPPER LOW/TROUGH -- WITHIN THE LARGER-SCALE MEAN
RIDGE ACROSS WRN NOAM -- IS FORECAST TO DRIFT SLOWLY SEWD FROM
OREGON...REACHING THE NRN NV VICINITY BY THE END OF THE PERIOD. IN
CONJUNCTION WITH THE VERY WEAK HEIGHT FALLS OVER THE INTERMOUNTAIN
WEST NEAR AND AHEAD OF THIS SYSTEM...WIDESPREAD SHOWERS AND ISOLATED
THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE AFTERNOON.
HOWEVER...WITH A LACK OF FAVORABLE INSTABILITY...SEVERE WEATHER IS
NOT EXPECTED.

ELSEWHERE...SHOWERS AND SCATTERED THUNDERSTORMS WILL BE POSSIBLE
ACROSS THE FL PENINSULA S OF THE COLD FRONT...BUT WEAK FLOW ALOFT
AND MODEST INSTABILITY WILL TEMPER UPDRAFT STRENGTH.

SHOWERS AND A THUNDERSTORM OR TWO MAY ALSO OCCUR ACROSS DEEP S TX IN
WEAK WARM ADVECTION REGIME...AND AFTERNOON SHOWERS MAY EVOLVE INVOF
THE GREAT LAKES REGION BENEATH THE MAIN UPPER TROUGH...THOUGH LITTLE
MORE THAN AN ISOLATED LIGHTNING STRIKE IS EXPECTED IN THIS AREA.

..GOSS.. 09/22/2012

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