DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 110504
SWODY2
SPC AC 110503

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1203 AM CDT TUE SEP 11 2012

VALID 121200Z - 131200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...

UPPER TROUGH WILL CONTINUE THROUGH THE NRN PLAINS AND GREAT LAKES
WEDNESDAY WITH SEVERAL IMPULSES ROTATING THROUGH THIS FEATURE
INCLUDING ONE THAT WILL ADVANCE THROUGH ONTARIO AND A COMPACT
SHORTWAVE TROUGH FORECAST TO DROP SEWD INTO ERN MT AND ND LATER
WEDNESDAY NIGHT. ATTENDANT COLD FRONT WILL MOVE THROUGH THE GREAT
LAKES WITH TRAILING PORTIONS CONTINUING ACROSS THE CNTRL PLAINS.
HIGH PRESSURE AT THE SFC AND ALOFT SHOULD REMAIN ANCHORED OVER THE
ERN STATES...WHILE CUTOFF LOW EMBEDDED IN WEAK FLOW ALOFT OVER THE
SWRN U.S. WILL MOVE SLOWLY EAST.

...SWRN STATES THROUGH CNTRL PLAINS...

THUNDERSTORM DEVELOPMENT WILL PERSIST WITHIN PLUME OF SUBTROPICAL
MOISTURE FROM THE SWRN STATES AND SRN/CNTRL ROCKIES INTO FRONTAL
ZONE ACROSS THE CNTRL PLAINS AND UPPER MS VALLEY. TRAJECTORIES WILL
BECOME MORE SLY OVER THE WRN GULF RESULTING IN GULF MOISTURE
RETURNING THROUGH S TX. HOWEVER...LOW LEVEL MOISTURE WILL BE MORE
LIMITED FARTHER NORTH FROM OK INTO THE CNTRL PLAINS RESULTING IN
WEAK INSTABILITY IN VICINITY OF THE COLD FRONT. WHERE SUFFICIENT
DIABATIC HEATING OCCURS...STORMS COULD PRODUCE ISOLATED STRONG WIND
GUSTS PROMOTED BY INVERTED-V BOUNDARY LAYERS...BUT COVERAGE OF ANY
SEVERE GUSTS IS EXPECTED TO REMAIN SPARSE.

...GULF COASTAL AREA...

OTHER SHOWERS AND THUNDERSTORMS MAY DEVELOP ALONG PORTIONS OF THE
GULF COAST WITHIN SECONDARY MOISTURE PLUME AND IN ASSOCIATION WITH A
SLOW MOVING...WEAK UPPER LOW.

..DIAL.. 09/11/2012

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