SPC AC 240714
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0114 AM CST TUE NOV 24 2009
VALID 261200Z - 271200Z
...SYNOPSIS/FCST...
PROGRESSIVE SPLIT UPR FLOW REGIME WILL CONTINUE ON
THANKSGIVING...FEATURING A HIGH-AMPLITUDE POLAR JET AND MODERATELY
ACTIVE SRN STREAM. THE DEEP COLD TROUGH EVOLVING OVER THE ERN THIRD
OF THE COUNTRY WILL MIGRATE TO THE ERN SEABOARD THROUGH THURSDAY.
IN WAKE OF THIS SYSTEM...A FRESH CP AIR MASS WILL PENETRATE S OF
CUBA AND DEEP INTO THE SRN GULF OF MEXICO BY THURSDAY NIGHT. THERE
WILL LIKELY BE A FEW LINGERING SHOWERS/TSTMS NEAR S FL/FL STRAITS
EARLY ON THURSDAY...BUT ACTIVITY WILL DIMINISH QUICKLY.
MEANWHILE...A NEW UPR TROUGH WILL ARRIVE IN THE PAC NW EARLY ON
THANKSGIVING AND THEN PROGRESS INLAND BY EARLY FRIDAY. SYSTEM WILL
BE ACCOMPANIED BY COLD MID-LVL TEMPERATURES AOB MINUS 30 DEG C AND
SPORADIC TSTMS WILL BE POSSIBLE IN THE POST-FRONTAL UPSLOPE REGIME
ACROSS CSTL ORE/WA DURING THE DAY.
FINALLY...A SRN STREAM DISTURBANCE SEEMS LIKELY TO STRENGTHEN OVER
NRN MEXICO AND ROTATE NEWD TOWARD THE BORDERLAND OVERNIGHT THURSDAY.
TYPICAL STEEP LAPSE RATE ENVIRONMENT AND MOISTENING OVER THE MEXICAN
MOUNTAINS WILL CONTRIBUTE TO A FEW TSTMS THANKSGIVING DAY...A FEW OF
WHICH MAY DEVELOP/MOVE TOWARD THE RIO GRANDE VLY OF SWRN TX THURSDAY
NIGHT.
..RACY.. 11/24/2009
NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 0830Z
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