DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 270602
SWODY2
SPC AC 270600

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0100 AM CDT TUE APR 27 2010

VALID 281200Z - 291200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
LARGE UPPER TROUGH IS FORECAST TO CONTINUE DIGGING/EXPANDING ACROSS
THE WRN U.S. THIS PERIOD...WITH CYCLONIC FLOW FORECAST ACROSS THE
ENTIRE WRN HALF OF THE U.S. BY THE END OF THE PERIOD. BROAD
CYCLONIC FLOW IS ALSO PROGGED OVER MOST OF THE ERN U.S. AS AN UPPER
LOW OVER ERN CANADA AND NEW ENGLAND MEANDERS SLOWLY EWD THROUGH THE
PERIOD.

THE MAIN FOCUS FOR DEEP CONVECTION THIS PERIOD WILL BE OVER THE WRN
HALF OF THE U.S. IN CONJUNCTION WITH THE WRN UPPER SYSTEM. SHOWERS
AND A FEW THUNDERSTORMS ARE EXPECTED OVER THE NWRN QUARTER OF THE
COUNTRY...AS COOL AIR ALOFT BENEATH THE UPPER TROUGH CONTRIBUTES TO
MODEST AFTERNOON INSTABILITY.

FARTHER E...THE ADVANCING UPPER TROUGH WILL DRIVE LOW PRESSURE
DEVELOPMENT OVER THE CENTRAL/NRN HIGH PLAINS REGION...WITH
ASSOCIATED SLY LOW-LEVEL FLOW ACROSS THE PLAINS LEADING TO A MODEST
RETURN OF MOISTURE. WHILE MOISTENING/DESTABILIZATION WILL LIKELY
REMAIN INSUFFICIENT FOR APPRECIABLE SEVERE POTENTIAL...A FEW
THUNDERSTORMS MAY DEVELOP DURING THE AFTERNOON ACROSS THE
DAKOTAS/NWRN NEB. THOUGH SHEAR WILL BE SUPPORTIVE OF ORGANIZED
STORMS...AGAIN THE INSUFFICIENT MOISTURE/DESTABILIZATION SUGGEST
THAT STORMS WILL NOT POSE MUCH SEVERE THREAT. STORMS WILL LIKELY
CONTINUE/SHIFT EWD ACROSS THE DAKOTAS OVERNIGHT AS A 70 KT SLY/SSWLY
LOW-LEVEL JET DEVELOPS ACROSS THE PLAINS YIELDING INCREASED WARM
ADVECTION/ASCENT. HOWEVER...ELEVATED INSTABILITY SHOULD REMAIN
INSUFFICIENT FOR APPRECIABLE HAIL POTENTIAL.

..GOSS.. 04/27/2010

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