Wednesday, September 21, 2011

DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 210725
SWODY3
SPC AC 210724

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0224 AM CDT WED SEP 21 2011

VALID 231200Z - 241200Z

...SYNOPSIS...
LARGE UPPER LOW LIKELY TO LIE INVOF THE UPPER GREAT LAKES AT THE
START OF THE PERIOD IS PROGGED TO MAKE VERY LITTLE PROGRESS THROUGH
THE PERIOD. WHILE MORE MINOR DISTURBANCES WILL MOVE THROUGH THE
BROAD CYCLONIC FLOW FIELD AROUND THE PERIPHERY OF THE LOW AND THUS
AFFECT THE GULF AND ATLANTIC COASTAL STATES...THE OVERALL SYSTEM
WILL MOVE LITTLE.

AT THE SURFACE...THE FRONT MOVING ACROSS THE ERN THIRD OF THE U.S.
WILL CONTINUE ACROSS THE APPALACHIANS AND INTO THE ATLANTIC COAST
STATES THROUGH THE PERIOD.

A WEAKLY UNSTABLE WARM SECTOR AHEAD OF THE ADVANCING FRONT WILL
AGAIN SUPPORT WIDESPREAD SHOWERS AND EMBEDDED THUNDERSTORMS THROUGH
THE ENTIRE PERIOD. HOWEVER...SHEAR/INSTABILITY COMBINATION EXPECTED
ATTM ACROSS THE AREA REMAINS INSUFFICIENT TO WARRANT INCLUSION OF
EVEN LOW SEVERE PROBABILITIES ATTM.

..GOSS.. 09/21/2011

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