DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 290428
SWODY2
SPC AC 290426

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1026 PM CST WED NOV 28 2012

VALID 301200Z - 011200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
THE NEXT IN A SERIES OF SHORTWAVE IMPULSES WILL PROGRESS INLAND OVER
THE PAC NW COAST ON FRIDAY...AROUND THE SERN PERIPHERY OF A DEEP
CLOSED LOW OVER THE SE GULF OF ALASKA. STEEPENING LOW-MIDLEVEL
LAPSE RATES...PRIMARILY IN THE POST-FRONTAL ENVIRONMENT FRIDAY
NIGHT...WILL CONTRIBUTE TO WEAK BUOYANCY NEAR THE COAST AND AN
ATTENDANT RISK FOR ISOLATED LOW-TOPPED THUNDERSTORMS.

OTHERWISE...A LARGELY ZONAL FLOW REGIME IS EXPECTED ACROSS THE CONUS
FROM THE ROCKIES TO THE ATLANTIC COAST. A LEE TROUGH WILL DEVELOP
ACROSS THE PLAINS IN RESPONSE TO AN INITIAL SHORTWAVE TROUGH
CROSSING THE CENTRAL ROCKIES...AND THIS WILL INDUCE NWD MOISTURE
RETURN ACROSS THE WRN GULF OF MEXICO AND S TX. FORECAST SOUNDINGS
SHOW THE POTENTIAL FOR AT LEAST WEAK SURFACE-BASED INSTABILITY
ACROSS S TX FRIDAY AFTERNOON AS BOUNDARY LAYER DEWPOINTS IN THE
MID-UPPER 60S SPREAD INLAND. HOWEVER... RELATIVELY POOR MIDLEVEL
LAPSE RATES AND A LACK OF FORCING FOR ASCENT BOTH SUGGEST THAT
THUNDERSTORM INITIATION IS IMPROBABLE AND AN OUTLOOK AREA IS NOT
NECESSARY AT THIS TIME.

..THOMPSON.. 11/29/2012

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