SWODY1
SPC AC 211621
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1021 AM CST WED JAN 21 2009
VALID 211630Z - 221200Z
...NO SVR TSTM AREAS FORECAST...
...SRN CA/AZ AREA THROUGH EARLY THURSDAY...
A MID LEVEL TROUGH LOCATED NEAR 28 N AND 125 W WILL CONTINUE TO MOVE
SLOWLY ENEWD TOWARD SRN CA/NRN BAJA THROUGH TOMORROW. REGIONAL 12Z
SOUNDINGS ACROSS CA/AZ SHOW PRELIMINARY MOISTENING AROUND 700 MB AND
POTENTIALLY VERY WEAK INSTABILITY IN THE 700-400 MB LAYER DOWNSTREAM
FROM THIS ERN PAC TROUGH. HOWEVER...THE THREAT FOR THUNDERSTORMS
BASED IN THE MID LEVELS TODAY WILL BE LIMITED BY AT BEST WEAK ASCENT
AND LITTLE IMMEDIATE POTENTIAL FOR ADDITIONAL DESTABILIZATION. THE
POSSIBILITY OF ISOLATED THUNDERSTORMS NEAR THE SRN CA COAST WILL
INCREASE SOME VERY LATE IN THE PERIOD /BY 09-12Z/ AS A PLUME OF
RICHER PW VALUES NEAR 1.25 INCHES OVERSPREADS SRN CA AND RESULTS IN
SOMEWHAT GREATER INSTABILITY BASED CLOSER TO THE GROUND.
..THOMPSON.. 01/21/2009
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