SWODY1
SPC AC 061212
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0612 AM CST SUN DEC 06 2009
VALID 061300Z - 071200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
A LARGE TROUGH OVER THE NWRN STATES WILL BE SLOW TO MOVE AS PART OF
AN OMEGA BLOCK OVER THE NERN PACIFIC/GULF OF AK. WITHIN THIS
REGIME...AN INITIAL CLOSED LOW JUST NW OF SLC WILL WEAKEN WHILE A
NEW CLOSED LOW EVOLVES OVER SW ORE/NRN CA FROM A SHORTWAVE TROUGH
NOW DIGGING SWD OVER WRN WA/ORE. COLD TEMPERATURES ALOFT AND STEEP
LOW-MID LEVEL LAPSE RATES WILL ACCOMPANY THE NEW CLOSED LOW...BUT A
VERY LOW PW ENVIRONMENT AND A TENDENCY FOR WEAK OFFSHORE FLOW OF
CONTINENTAL AIR WILL LIMIT THE POTENTIAL FOR THUNDERSTORMS OVER
LAND.
ELSEWHERE...A WEAK RETURN FLOW CYCLE IS UNDERWAY ACROSS THE NW GULF
COAST...IN ADVANCE OF MID-UPPER SPEED MAX WHICH WILL EJECT ENEWD
FROM THE FOUR CORNERS TO THE MID MS VALLEY. CONTINUED AIR MASS
MODIFICATION ALONG THE AXIS OF A SLY/SSWLY LLJ WILL CONTRIBUTE TO
SUFFICIENT MOISTENING/DESTABILIZATION FOR SOME ELEVATED CONVECTION
BY TONIGHT OVER SE TX/LA IN THE WAA REGIME. THE ONLY OTHER AREA OF
SOME MINOR CONCERN WILL BE THE SE FL COAST. IT APPEARS THAT SOME
MOISTENING WILL OCCUR AS A DIFFUSE SURFACE WAVE FORMS NEAR THE
COAST...BUT ONLY WEAK/SHALLOW ASCENT AND REMAINING CONVECTIVE
INHIBITION SHOULD PRECLUDE DEEP CONVECTION/THUNDERSTORM DEVELOPMENT.
..THOMPSON.. 12/06/2009
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