SWODY1
SPC AC 300057
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0757 PM CDT MON OCT 29 2007
VALID 300100Z - 301200Z
..NO SVR TSTM AREAS FORECAST...
..CNTRL CA...
THE LATEST WATER VAPOR IMAGERY SHOWS THE AXIS OF AN UPPER-LEVEL
TROUGH JUST OFF THE CA COAST. THIS FEATURE WILL MOVE INLAND THIS
EVENING AND CONTINUE TO SPREAD STRONG LARGE-SCALE ASCENT AND COLD
AIR ALOFT ACROSS THE REGION TONIGHT SUPPORTING SCATTERED TO NUMEROUS
THUNDERSTORMS. OBJECTIVE ANALYSIS CURRENTLY INDICATES THE EXISTENCE
OF STEEP MID-LEVEL RATES...MODERATE VERTICAL SHEAR AND ENOUGH
INSTABILITY ACROSS CNTRL CA FOR A MARGINAL SEVERE THREAT. THE THREAT
SHOULD BE CONFINED TO THE SAN JOAQUIN VALLEY OF CNTRL CA AND THE
STRONGER CELLS MAY CONTAIN HAIL AND GUSTY WINDS. HOWEVER...SFC TEMPS
ARE ALREADY COOLING ACROSS CNTRL CA AND THIS WILL REDUCE INSTABILITY
OVER THE NEXT 1 TO 2 HOURS. IN RESPONSE...THE SEVERE THREAT SHOULD
GRADUALLY DIMINISH THIS EVENING ACROSS THE REGION.
ELSEWHERE...A QUASI-STATIONARY FRONTAL BOUNDARY IS IN PLACE ACROSS
CNTRL FL. CONVERGENCE ALONG THE BOUNDARY COMBINED WITH SUBTLE LIFT
ASSOCIATED WITH A PLUME OF MID-LEVEL MOISTURE EVIDENT ON WATER VAPOR
IMAGERY MAY SUPPORT ISOLATED TO SCATTERED THUNDERSTORM DEVELOPMENT
THIS EVENING AND POSSIBLY OVERNIGHT.
.BROYLES.. 10/30/2007
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