SWODY1
SPC AC 071244
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0644 AM CST SAT FEB 07 2009
VALID 071300Z - 081200Z
...NO SVR TSTM AREAS FORECAST...
...SRN CA/NV INTO WRN AZ THROUGH TONIGHT...
THE CLOSED MID-UPPER LOW JUST OFF THE SRN CA COAST THIS MORNING WILL
MOVE SLOWLY EWD TO WRN AZ BY THE END OF THE PERIOD. A BELT OF
PRONOUNCED MID LEVEL ASCENT AND MOISTENING /DRIVEN LARGELY BY
DIFFERENTIAL CVA IN THE LEFT EXIT REGION OF THE UPPER JET/ WILL
ACCOMPANY THIS LOW EWD ACROSS SRN CA TO THE LOWER CO RIVER
TODAY...AND INTO CENTRAL AZ BY EARLY SUNDAY. STEEPENING LOW-MID
LEVEL LAPSE RATES WITH THE -25 C 500 MB COLD CORE WILL SPREAD INLAND
THROUGH THE PERIOD...SUPPORTING WEAK INSTABILITY AND THE POTENTIAL
FOR ISOLATED THUNDERSTORMS. GREATER LOW-LEVEL MOISTURE /BOUNDARY
LAYER DEWPOINTS NEAR 50 F/ AND PASSAGE OF THE MID LEVEL COLD POOL
DURING THE DAY COULD SUPPORT A FEW STORMS WITH SMALL HAIL ACROSS
EXTREME SRN CA.
...ELSEWHERE ACROSS THE CONUS...
THE NWD RETURN OF A MODIFYING CP AIR MASS IS ONGOING FROM THE WRN
GULF OF MEXICO INTO THE SRN PLAINS. HOWEVER...THE MARGINAL BOUNDARY
LAYER MOISTURE /DEWPOINTS GENERALLY IN THE 50S/ AND RELATIVELY WARM
TEMPERATURES ABOVE THE BOUNDARY LAYER WILL PRECLUDE DEEP CONVECTION.
..THOMPSON.. 02/07/2009
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