SWODY1
SPC AC 130048
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0748 PM CDT WED AUG 12 2009
VALID 130100Z - 131200Z
...THERE IS A SLGT RISK OF SVR TSTMS ACROSS THE CENTRAL PLAINS...
...CENTRAL PLAINS...
00Z SOUNDING FROM LBF EXHIBITS CONSIDERABLE AMOUNT OF UNCAPPED
SFC-BASED INSTABILITY...ON THE ORDER OF 3000 J/KG. SCATTERED
THUNDERSTORMS HAVE EVOLVED WITHIN THIS ENVIRONMENT ACROSS THE PLAINS
OF SCNTRL SD...SWD INTO SERN CO. AS LLJ INCREASES THIS EVENING IT
APPEARS FORCING WILL BE SUFFICIENT FOR ACTIVITY TO CONTINUE ITS SEWD
MOVEMENT. ALTHOUGH DEEP LAYER SHEAR IS NOT PARTICULARLY
STRONG...MEAN FLOW WOULD SEEM TO SUPPORT A THREAT OF STRONG/SEVERE
MULTI-CELL UPDRAFTS CAPABLE OF GENERATING SOME HAIL OR PERHAPS GUSTY
WINDS.
...ELSEWHERE...
NUMEROUS SHOWERS/THUNDERSTORMS HAVE CONVERGED ALONG AN AXIS FROM
SERN AL...INTO SRN GA. THIS ACTIVITY WILL SOON OVERTURN WHAT LITTLE
INSTABILITY REMAINS AND GRADUAL WEAKENING OF UPDRAFTS CAN BE
EXPECTED.
FARTHER NW ACROSS MT...SCATTERED HIGH BASED THUNDERSTORMS HAVE
DEVELOPED AHEAD OF WIND SHIFT FROM NEAR BZN TO SW OF GGW. THIS
CONVECTION HAS EVOLVED WITHIN A FAIRLY DRY ENVIRONMENT AND WILL POSE
LITTLE MORE THAN A GUSTY WIND THREAT BEFORE ACTIVITY WEAKENS WITH
LOSS OF DAYTIME HEATING.
..DARROW.. 08/13/2009
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