SWODY1
SPC AC 070041
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0641 PM CST FRI FEB 06 2009
VALID 070100Z - 071200Z
...NO SVR TSTM AREAS FORECAST...
...CNTRL AND SRN CA...
UPPER TROUGH OFF THE CNTRL CA COAST WILL CONTINUE DROPPING SWD
TONIGHT. A STRONG UPPER JET HAS ROTATED AROUND THE BASE OF THIS
TROUGH WITH EXIT REGION EXTENDING INTO S CNTRL CA . NORTH OF THIS
JET STREAK...A VORTICITY MAXIMUM WAS EVIDENT NEAR THE CNTRL CA
COAST. STEEPER MID LEVEL LAPSE RATES NORTH OF THE UPPER JET AND
FORCING FOR ASCENT WILL CONTINUE TO PROMOTE THE DEVELOPMENT OF
SCATTERED CONVECTION TONIGHT ACROSS CNTRL AND SRN CA AS THE UPPER
TROUGH ADVANCES SWD.
WEAK SURFACE LOW HAS DEVELOPED OFF THE CNTRL CA COAST IN ASSOCIATION
WITH THE UPPER LOW...AND THIS FEATURE WILL DROP SWD TONIGHT. AS THIS
OCCURS...LOW LEVEL WINDS WEST OF THE SRN CA COASTAL MOUNTAINS ARE
EXPECTED TO BACK...AIDED BY LOCAL TERRAIN EFFECTS. OBSERVATIONAL
TRENDS ALREADY INDICATE LOW LEVEL FLOW IN THIS REGION BACKING FROM
SW TO SSWLY. LOCAL BACKING OF THE WINDS WITH TIME BENEATH THE UPPER
JET CORE WILL CONTRIBUTE TO VERTICAL SHEAR SUPPORTIVE OF UPDRAFT
ROTATION. THREAT FOR A FEW LOW TOPPED ROTATING UPDRAFTS WILL PERSIST
INTO THE EVENING. ISOLATED SMALL HAIL AND A BRIEF TORNADO REMAIN
POSSIBLE...BUT MEAGER INSTABILITY WILL CONTINUE TO LIMIT OVERALL
THREAT.
..DIAL.. 02/07/2009
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