SWODY1
SPC AC 270548
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1148 PM CST SAT NOV 26 2011
VALID 271200Z - 281200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
A LARGE/SHARP UPPER TROUGH -- WHOSE AXIS WILL INITIALLY EXTEND FROM
THE WRN UPPER GREAT LAKES REGION SSWWD INTO E TX -- WILL CONTINUE
MOVING SLOWLY EWD WITH TIME. BY THE END OF THE PERIOD...THE TROUGH
SHOULD BEGIN TO EVOLVE INTO A BROAD UPPER LOW CENTERED OVER THE
MIDDLE AND LOWER GULF COAST REGIONS. MEANWHILE FARTHER W...A LARGE
RIDGE OVER THE WEST WILL BECOME FLATTENED/SUPPRESSED SWD WITH TIME
AS A WEAKENING TROUGH MOVES ACROSS WRN CANADA BUT MORE SLOWLY EWD
INTO THE PAC NW.
AT THE SURFACE...A COLD FRONT IS INITIALLY PROGGED TO EXTEND FROM
THE ERN UPPER GREAT LAKES SSWWD INTO THE CENTRAL GULF OF MEXICO.
WITH TIME...CYCLOGENESIS IS FORECAST ALONG THIS FRONT INVOF THE SRN
APPALACHIANS...AS THE ASSOCIATED UPPER LOW DEVELOPS.
A LARGE BAND OF RAIN WILL BE ONGOING INVOF THE FRONT AT THE START OF
THE PERIOD...WITH A FEW EMBEDDED LIGHTNING STRIKES POTENTIALLY
LINGERING OVER THE CENTRAL GULF COAST STATES. WHILE FLOW ALOFT WILL
BE STRONG ENOUGH TO SUPPORT STRONGER UPDRAFTS DURING THE DAY...A
LACK OF APPRECIABLE INSTABILITY SUGGESTS ONLY OCCASIONAL LIGHTNING
OVER SRN AL/THE FL PANHANDLE AND VICINITY -- AND VERY LITTLE IF ANY
SEVERE POTENTIAL.
..GOSS.. 11/27/2011
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