SWODY1
SPC AC 070554
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1254 AM CDT TUE APR 07 2009
VALID 071200Z - 081200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
AMPLIFIED LARGE SCALE PATTERN WILL PERSIST OVER THE CONUS...WITH THE
PRIMARY CONVECTIVE/ISOLATED TSTM POTENTIAL TODAY ACROSS CA/ORE TIED
TO THE EASTWARD MIGRATION OF AN UPPER LOW CURRENTLY NEAR 34N/130W.
OTHERWISE...COOL/STABLE CONDITIONS WILL PRECLUDE TSTMS ACROSS THE
REMAINDER OF THE CONUS.
...CA...
AS THE UPPER LOW NEARS THE CA COAST...LEADING FRONTAL CONVECTIVE
BAND /WITH SOME EMBEDDED TSTM POTENTIAL/ SHOULD MOVE INLAND ACROSS
CA THROUGH LATE MORNING/EARLY AFTERNOON. IN THE WAKE OF THIS INITIAL
CONVECTIVE BAND...MODEST HEATING BENEATH THE UPPER LOW /-25C AT 500
MB/ WILL SUPPORT THE DEVELOPMENT OF WEAK CAPE THIS AFTERNOON...WITH
SBCAPE GENERALLY LIMITED TO 250 J/KG. THIS WEAK BUOYANCY...ALONG
WITH A POST-CONVECTIVE BAND TENDENCY FOR VEERED LOW LEVEL FLOW
ACROSS THE CENTRAL VALLEY...IS EXPECTED TO LIMIT THE SEVERE RISK
TODAY. NEVERTHELESS...ISOLATED TSTMS WILL BE POSSIBLE BY LATE
AFTERNOON/EARLY EVENING AS THE UPPER VORT NEARS THE COAST...WITH THE
POSSIBILITY OF SMALL HAIL ACROSS THE CENTRAL CA COASTAL AREAS.
..GUYER/SMITH.. 04/07/2009
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