SWOD48
SPC AC 130818
DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0318 AM CDT WED AUG 13 2008
VALID 161200Z - 211200Z
...DISCUSSION...
LATEST MEDIUM-RANGE GUIDANCE IS RELATIVELY CONSISTENT IN THE
EVOLUTION OF THE LARGE-SCALE PATTERN THROUGH THE EXTENDED PERIOD.
AN UPPER LOW WHICH WILL PERSIST OVER THE CNTRL U.S. THROUGH MUCH OF
THE FORECAST IS EXPECTED TO FOCUS TSTM DEVELOPMENT INITIALLY OVER
THE SRN PLAINS AND EVENTUALLY INTO THE MS AND OH RIVER VALLEYS.
SOME POTENTIAL WILL EXIST FOR SEVERE WEATHER GIVEN THE MOIST AND
UNSTABLE AIR MASS WHICH WILL RESIDE ACROSS SYSTEM WARM SECTOR.
HOWEVER...IT APPEARS THAT VERTICAL SHEAR WILL TEND TO DIMINISH WITH
TIME AS THE MIDLEVEL CIRCULATION SLOWLY WEAKENS. AS SUCH...THE
THREAT FOR A MORE ORGANIZED SEVERE WEATHER EPISODE REMAINS LOW ATTM.
..MEAD.. 08/13/2008
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