SWODY1
SPC AC 050511
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1111 PM CST WED FEB 04 2009
VALID 051200Z - 061200Z
...NO SVR TSTM AREAS FORECAST...
...CA COASTAL AREA...
CLOSED UPPER LOW SITUATED A FEW HUNDRED MILES OFF THE CA COAST IS
FORECAST TO DEAMPLIFY AND EJECT ENEWD AS AN OPEN WAVE THROUGH CA IN
RESPONSE TO AN UPSTREAM SHORTWAVE TROUGH CURRENTLY DROPPING SEWD
FROM THE GULF OF ALASKA. SEVERAL IMPULSES WILL EJECT NEWD FROM THE
UPPER LOW AS IT MOVES TOWARD THE CA COAST.
WIDESPREAD CLOUDS WITHIN WARM CONVEYOR BELT DOWNSTREAM FROM UPPER
TROUGH WILL LIKELY LIMIT BOUNDARY LAYER HEATING MUCH OF THE DAY. IN
WAKE OF THIS BAND OF ASCENT...MODEST STEEPENING OF MID LEVEL LAPSE
RATES RESULTING PRIMARILY FROM COLDER AIR ALOFT ATTENDING THE UPPER
TROUGH WILL SPREAD ONSHORE. LIFT ASSOCIATED WITH VORTICITY MAXIMA
ROTATING THROUGH THE UPPER TROUGH WILL LIKELY CONTRIBUTE TO AREAS OF
SCATTERED CONVECTION BY THURSDAY AFTERNOON. INSTABILITY WILL REMAIN
VERY MARGINAL...BUT MAY BE SLIGHTLY GREATER NEAR THE COAST WHERE THE
MARINE BOUNDARY LAYER WILL EXIST BENEATH MODEST COLD ADVECTION
ALOFT. COVERAGE OF ANY THUNDERSTORM ACTIVITY ONSHORE WILL PROBABLY
REMAIN AOB 10% DUE TO THE EXPECTED MARGINAL THERMODYNAMIC
ENVIRONMENT.
..DIAL.. 02/05/2009
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