SWODY1
SPC AC 290038
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0638 PM CST SUN DEC 28 2008
VALID 290100Z - 291200Z
...NO SVR TSTM AREAS FORECAST...
...CNTRL GULF COAST INTO THE CAROLINAS...
SURFACE COLD FRONT EXTENDING FROM S-CNTRL AL INTO FAR SERN VA WILL
SLOWLY SAG SEWD OVERNIGHT IN WAKE OF DEEP CYCLONE OVER QUEBEC.
ALOFT...EVENING WATER VAPOR IMAGERY SHOWS A LEAD SHORT WAVE TROUGH
LIFTING NEWD THROUGH THE LOWER OH VALLEY WITH A MORE AMPLIFIED
TROUGH TRANSLATING EWD THROUGH THE SRN PLAINS. THIS LATTER FEATURE
WILL CONTINUE EWD THROUGH THE LOWER MS VALLEY TONIGHT.
WHILE PRE-FRONTAL AIR MASS IS RELATIVELY MOIST /NAMELY ALONG THE
CNTRL AND ERN GULF COAST/...REGIONAL 00Z SOUNDINGS INDICATE THAT
POOR MIDLEVEL LAPSE RATES ARE LIMITING WARM SECTOR MUCAPE TO ONLY A
COUPLE HUNDRED J/KG. THIS MARGINAL INSTABILITY WILL PRECLUDE ANY
SEVERE WEATHER POTENTIAL THROUGH THE REMAINDER OF THE FORECAST
PERIOD. NONETHELESS...FRONTAL CONVERGENCE AND INCREASING
LARGE-SCALE FORCING IN ADVANCE OF UPSTREAM TROUGH WILL LIKELY
MAINTAIN A FEW CLUSTERS OF TSTMS ALONG LOW-LEVEL BAROCLINIC ZONE
OVERNIGHT.
..MEAD.. 12/29/2008
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