SWODY3
SPC AC 200729
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0229 AM CDT TUE OCT 20 2009
VALID 221200Z - 231200Z
...SYNOPSIS...
SRN STREAM UPPER LOW/TROUGH IS FORECAST TO CONTINUE MOVING EWD/ENEWD
ACROSS THE CENTRAL U.S. AND BEGIN AFFECTING THE MS VALLEY REGION
THIS PERIOD. AS THIS OCCURS...A SURFACE LOW INITIALLY INVOF ERN OK
SHOULD SHIFT ENEWD INTO/ACROSS THE MID MS VALLEY...WHILE THE
TRAILING COLD FRONT CROSSES E TX/AR/LA...REACHING THE LOWER MS
VALLEY BY THE END OF THE PERIOD. THIS FRONT SHOULD CONTINUE TO
SERVE AS A FOCUS FOR FAIRLY WIDESPREAD -- BUT GENERALLY SUB-SEVERE
-- CONVECTION THROUGH THE PERIOD.
...LOWER MS VALLEY/CENTRAL GULF COAST REGION...
CONVECTION SHOULD BE ONGOING AT THE START OF THE PERIOD AHEAD OF THE
ADVANCING FRONT...AND SHOULD SPREAD ACROSS THE CENTRAL GULF COAST
REGION THROUGH THE DAY. WEAK LAPSE RATES AND ONGOING
CLOUDS/PRECIPITATION SHOULD HINDER POTENTIAL FOR APPRECIABLE
DESTABILIZATION -- THUS LIMITING ANY SEVERE THREAT. WHILE SHEAR MAY
BE SUFFICIENT TO SUPPORT A FEW STRONGER UPDRAFTS EMBEDDED WITHIN
LARGER AREA OF CONVECTION SPREADING ACROSS THIS REGION...ANY SEVERE
THREAT APPEARS QUITE LIMITED/MARGINAL ATTM.
..GOSS.. 10/20/2009
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