SWODY1
SPC AC 171610
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1110 AM CDT WED SEP 17 2008
VALID 171630Z - 181200Z
...NO SVR TSTM AREAS FORECAST...
...FL...
FAIRLY ACTIVE DAY EXPECTED ACROSS SECTIONS OF FL AHEAD OF WELL
DEFINED SHORTWAVE TROUGH NOW SHIFTING EWD ACROSS FL/NRN GA...WITH
ASSOCIATED SURFACE FRONT SAGGING SWD INTO NRN FL THROUGH THE
AFTERNOON. OBSERVED AND FORECAST SOUNDINGS INDICATE SEASONABLY COOL
MID LEVEL TEMPERATURES IN PLACE OVER THE REGION...ATOP ABUNDANT LOW
LEVEL MOISTURE (SFC DEW POINTS IN THE LOWER 70S). LATE MORNING
VISIBLE IMAGERY SUGGESTS EARLIER CLOUDS WILL NO LONGER BE MUCH OF A
FACTOR IN LIMITING DIURNAL HEATING...WHICH WILL BOOST MLCAPE THROUGH
THE AFTERNOON. COMBINATION OF FOCUSING MECHANISMS NEAR MAIN SURFACE
FRONT/SEA-BREEZES AND MODERATE INSTABILITY/COOL AIR ALOFT SHOULD
ENHANCE THUNDERSTORM POTENTIAL. ALTHOUGH WEAK SHEAR WILL LIMIT
ORGANIZATION/PERSISTENCE OF STRONGER UPDRAFTS...PARAMETERS SHOULD
STILL SUPPORT AT LEAST A FEW STRONG/SEVERE WIND GUSTS AND MARGINALLY
SEVERE HAIL FROM MORE INTENSE STORM CLUSTERS INTO THE EARLY EVENING.
...WESTERN STATES...
SUFFICIENT MID LEVEL MOISTURE AND COOL AIR ALOFT REMAIN IN PLACE
OVER MUCH OF THE WEST AS REGION REMAINS DISPLACED FROM MAIN BELT OF
WESTERLIES EXTENDING FROM THE PAC NW EWD ALONG THE CANADIAN
PRAIRIES. SEVERAL LOW AMPLITUDE TROUGHS ARE EVIDENT THIS MORNING AND
SHOULD FOCUS RENEWED NON-SEVERE THUNDERSTORM
DEVELOPMENT...ESPECIALLY OVER HIGHER TERRAIN...AS AFTERNOON HEATING
STEEPENS LAPSE RATES AND PRODUCES WEAK INSTABILITY.
..EVANS/GRAMS.. 09/17/2008
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