SWODY1
SPC AC 060529
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1129 PM CST SAT JAN 05 2008
VALID 061200Z - 071200Z
..NO SVR TSTM AREAS FORECAST...
..NWRN CA THROUGH THE PACIFIC NW COASTAL AREAS...
BROAD LARGE SCALE UPPER TROUGH WILL PROGRESS EWD THROUGH THE WRN AND
CNTRL STATES SUNDAY. NUMEROUS VORTICITY MAXIMA WILL CONTINUE TO MOVE
THROUGH THIS FEATURE. COLD AIR ALOFT AND STEEP LAPSE RATES WILL
PERSIST FROM NRN CA INTO THE PACIFIC NW REGION INTO MUCH OF SUNDAY.
THIS WILL CONTRIBUTE TO SOME INSTABILITY...ESPECIALLY NEAR THE
COASTAL AREAS WHERE SWLY ONSHORE FLOW WILL MAINTAIN HIGHER LOW LEVEL
DEWPOINTS. WIDELY SCATTERED TO ISOLATED LOW TOPPED THUNDERSTORMS
WILL REMAIN POSSIBLE IN THIS ENVIRONMENT DURING THE DAY. THREAT FOR
THUNDERSTORMS IS EXPECTED TO GRADUALLY DIMINISH SUNDAY NIGHT ALONG
THE COASTS AS THE UPPER TROUGH SHIFTS EAST WITH CORRESPONDING HEIGHT
RISES...WARMING MID LEVEL TEMPERATURES...AND STABILIZATION.
..MIDDLE THROUGH UPPER MS VALLEY REGION...
HEIGHT FALLS AND COOLING ALOFT ATTENDING EWD ADVANCING SHORTWAVE
TROUGHS WILL SPREAD EWD ABOVE AN AXIS OF MODIFIED CP AIR ADVECTING
NEWD THROUGH THE MS VALLEY REGION ALONG A STRONG SWLY LOW LEVEL JET.
THIS WILL CONTRIBUTE TO MARGINAL ELEVATED INSTABILITY. A FEW
THUNDERSTORMS WILL BE POSSIBLE LATE SUNDAY NIGHT...PRIMARILY WITHIN
ZONE OF INCREASING ASCENT AND DESTABILIZATION IN VICINITY OF
BAROCLINIC ZONE NORTH OF LOW LEVEL JET AXIS FROM NRN MO INTO IA AND
NRN IL.
.DIAL.. 01/06/2008
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