SWODY1
SPC AC 181928
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0128 PM CST SUN NOV 18 2007
VALID 182000Z - 191200Z
..NO SVR TSTM AREAS FORECAST...
..SOUTH TX...
AIR MASS ACROSS COASTAL AND INLAND SECTIONS OF S TX HAVE BECOME
MODERATELY UNSTABLE OWING TO STRONG SURFACE HEATING WITHIN A MOIST
BOUNDARY LAYER /SURFACE DEWPOINTS IN THE MID-UPPER 60S/. CONVECTIVE
OUTFLOW BOUNDARY FROM OVERNIGHT TSTM ACTIVITY CONTINUES TO PROGRESS
SWD. VISIBLE IMAGERY/LIGHTNING DATA INDICATED SOME CONVECTION AND A
FEW TSTMS DEVELOPING AS THE FRONT MOVES INTO THE MORE UNSTABLE AIR
MASS IN S TX. GIVEN PROGRESSION OF THIS BOUNDARY...ANY TSTMS THAT
DEVELOP WILL BE QUICKLY UNDERCUT. OVERALL TSTM POTENTIAL IS
EXPECTED TO BE MINIMAL AS FORCING FOR ASCENT DECREASES AND MID LEVEL
TEMPERATURES WARM GIVEN UPPER SHORT WAVE TROUGH TRACKING EWD AWAY
FROM THIS REGION.
..PARTS OF LOWER MS VALLEY...
ERN EXTENT OF CONVECTIVE OUTFLOW BOUNDARY IS EXPECTED TO REMAIN
MAINLY OFFSHORE IN THE NWRN GULF. WEAK WAA WILL MAINTAIN CONVECTIVE
POTENTIAL WITH ISOLATED TSTMS...MAINLY OFFSHORE...ALONG AND N OF
THIS BOUNDARY. EXTENSIVE NATURE OF CLOUDS EXTENDING NWD INTO LA
SHOULD PRECLUDE SUFFICIENT DESTABILIZATION FOR TSTM DEVELOPMENT
INLAND OVER THE LOWER MS VALLEY. A FEW LIGHTNING STRIKES MAY OCCUR
ALONG COASTAL SECTIONS OF SOUTH CENTRAL LA AS ANY OFFSHORE
CONVECTION DEVELOPS/TRACKS NNEWD THIS AFTERNOON.
.PETERS.. 11/18/2007
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