SWODY2
SPC AC 300509
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1109 PM CST SAT DEC 29 2007
VALID 311200Z - 011200Z
..NO SVR TSTM AREAS FORECAST...
..SOUTH FL...
EXPANSIVE AND DOMINANT SFC HIGH...CENTERED OVER THE CNTRL
ROCKIES...WILL BUILD SEWD ACROSS MUCH OF THE CONUS DURING THE DAY2
PERIOD RESULTING IN STRENGTHENING OFFSHORE FLOW ALONG THE GULF
COAST. A PREFRONTAL WIND SHIFT WILL DEVELOP WELL AHEAD OF MAIN COLD
FRONT ACROSS THE CNTRL FL PENINSULA WHICH WILL SERVE AS THE
DEMARKATION BETWEEN MOIST/WEAK LAPSE RATE ENVIRONMENT AND MORE
CONTINENTAL AIRMASS FARTHER NW. AHEAD OF THE PREFRONTAL WIND
SHIFT...FORECAST SOUNDINGS SUGGEST WEAK BUOYANCY IF LIFTING SFC
BASED PARCELS AS TEMPERATURES RISE TO NEAR 80F. LOW LEVEL
CONVERGENCE MAY PROVE ADEQUATE IN THE DEVELOPMENT OF ISOLATED
THUNDERSTORMS...HOWEVER INTENSITY OF UPDRAFTS SHOULD REMAIN RATHER
WEAK GIVEN THE THERMODYNAMIC ENVIRONMENT.
..OH VALLEY...
STRONG SPEED MAX WILL APPROACH THE UPPER OH VALLEY DURING THE LATTER
HALF OF THE DAY2 PERIOD. FOCUSED LARGE SCALE ASCENT WITHIN EXIT
REGION OF THIS FEATURE WILL ENHANCE CONVECTIVE POTENTIAL ALONG SHARP
FRONTAL ZONE. ALTHOUGH PROFILES ARE EXPECTED TO REMAIN QUITE
COLD...FORECAST SOUNDINGS SUGGEST VERY STEEP LAPSE RATES THAT SHOULD
RESULT IN SOME CONVECTION ACROSS THIS REGION. AT THIS TIME IT
APPEARS LIGHTNING ACTIVITY WILL REMAIN QUITE SPARSE...DUE MOSTLY TO
SHALLOW CLOUD DEPTH...THOUGH NOT ENTIRELY OUT OF THE QUESTION GIVEN
THE STRENGTH OF THE APPROACHING SYSTEM.
.DARROW.. 12/30/2007
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