SPC AC 241255
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0655 AM CST SAT NOV 24 2007
VALID 241300Z - 251200Z
...NO SVR TSTM AREAS FORECAST...
...TX ACROSS THE LOWER MS RIVER VALLEY...
STRONG MID/UPPER LEVEL JET WILL CONTINUE DIGGING/AMPLIFYING TROUGH
INTO NWRN MEXICO AND THE SWRN U.S. TODAY. AHEAD OF THIS
FEATURE...LOW LEVEL WAA AND DEEP ASCENT WILL STEADILY INCREASE OVER
THE SRN PLAINS AND SPREAD INTO THE LOWER MS RIVER VALLEY THROUGH THE
PERIOD. SURFACE LOW NOW JUST OFF THE CENTRAL TX COAST WILL MOVE
LITTLE TODAY...BUT WILL LIKELY BEGIN DEEPENING LATER TONIGHT AND
BEGIN LIFTING NNEWD TOWARDS THE UPPER TX/SWRN LA COAST SUNDAY
MORNING IN RESPONSE TO APPROACHING UPPER SYSTEM. THIS WILL LEAVE
INLAND AREAS UNDER INFLUENCE OF RELATIVELY STABLE CONTINENTAL AIR
MASS AND PRECLUDE MORE THAN MARGINAL...ELEVATED INSTABILITY THROUGH
THE PERIOD. ALTHOUGH THUNDERSTORMS WILL INCREASE IN COVERAGE AND
SPREAD STEADILY ENEWD THROUGH THE PERIOD...OVERALL SEVERE THREAT
APPEARS LOW THROUGH EARLY SUNDAY MORNING ACROSS MUCH OF THIS REGION.
ANY SEVERE THREAT WILL HINGE ON SURFACE LOW LOCATION AND NWD
TRANSPORT OF MARINE AIR AND SUBSEQUENT SURFACE-BASED INSTABILITY
INTO THE FAR UPPER TX AND LA COAST TOWARDS DAYBREAK SUNDAY. WILL
OPT TO MAINTAIN CURRENT FORECAST OF SEVERE THREAT INCREASING THROUGH
THE DAY 2 PERIOD /SUNDAY/...WITH FORECAST NOT WARRANTING DAY 1
SEVERE PROBABILITIES ATTM.
..EVANS/CROSBIE.. 11/24/2007
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 1630Z
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