DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 270601
SWODY2
SPC AC 270600

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0100 AM CDT WED MAR 27 2013

VALID 281200Z - 291200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
THE LARGE-SCALE UPPER PATTERN IS PROGGED TO REMAIN VIRTUALLY
UNCHANGED THIS PERIOD...WITH A LOW/TROUGH OFF THE W COAST...A RIDGE
OVER THE WEST...AND NWLY/CYCLONIC FLOW PREVAILING E OF THE ROCKIES.
AT THE SURFACE...HIGH PRESSURE WILL REMAIN IN PLACE OVER THE ERN
HALF OF THE CONUS. MEANWHILE...PRESSURE FALLS OVER THE SRN PLAINS
IN RESPONSE TO WLY FLOW ALOFT ACROSS THE SRN ROCKIES WILL RESULT IN
A LOW-LEVEL WARM ADVECTION REGIME EVOLVING ACROSS THE TX/OK REGION
WITH TIME.

...OK AND SURROUNDING AREAS...
THE AFTERNOON AIRMASS ACROSS THE SRN PLAINS REGION IS PROGGED TO
REMAIN GENERALLY CAPPED -- THOUGH DEEP MIXING OVER THE SRN HIGH
PLAINS COULD RESULT IN A BRIEFLY UNCAPPED AIRMASS BY LATE AFTERNOON
WHICH COULD SUPPORT ISOLATED/HIGH-BASED/WEAK CONVECTION. GREATER
THUNDER THREAT HOWEVER WILL EVOLVE AFTER DARK...AS A LOW-LEVEL JET
DEVELOPS AND CORRESPONDING ISENTROPIC ASCENT INCREASES. WHILE
INSTABILITY IS EXPECTED TO REMAIN INSUFFICIENT FOR VIGOROUS
CONVECTION...LIKELIHOOD FOR AT LEAST A CLUSTER OR TWO OF ELEVATED
CONVECTION WARRANTS CONTINUATION OF A 10% THUNDER AREA THIS
FORECAST.

..GOSS.. 03/27/2013

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