DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 020732
SWODY3
SPC AC 020730

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0230 AM CDT SUN SEP 02 2012

VALID 041200Z - 051200Z

...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PORTIONS OF THE CENTRAL
PLAINS...

...SYNOPSIS...
SOME AMPLIFICATION OF THE UPPER FLOW FIELD IS FORECAST ACROSS THE
CENTRAL U.S. AS A SHORT-WAVE TROUGH ROUNDS THE BASE OF THE MAIN
CENTRAL CANADA VORTEX -- THEREBY AMPLIFYING THE CYCLONIC FLOW ACROSS
THE NRN AND CENTRAL PLAINS. AT THE SURFACE HOWEVER...THE PATTERN
WILL REMAIN SOMEWHAT WEAK/DIFFUSE...WITH SOMEWHAT SUBTLE/REMNANT
FEATURES AIDING DEVELOPMENT OF SHOWERS AND STORMS ACROSS THIS AREA.
ELSEWHERE...APPRECIABLE SEVERE POTENTIAL IS NOT EVIDENT...WITH THE
REMNANTS OF ISAAC PROGGED TO FURTHER WEAKEN THROUGH THE PERIOD.

...NEB AND MID MO VALLEY VICINITY...
SIMILAR SETUP IS FORECAST ACROSS THE CENTRAL PLAINS BOTH AT THE
SURFACE AND ALOFT DAY 3 AS COMPARED TO DAY 2...WITH SLY/SELY
LOW-LEVEL FLOW BENEATH MODERATE MID-LEVEL WLYS -- RESULTING IN SHEAR
SUFFICIENT FOR ORGANIZED/ROTATING STORMS. THE GENERALLY WEAK
SURFACE PATTERN FORECAST LEADS TO SOME UNCERTAINTY IN DELINEATING
AREAS OF MORE CONCENTRATED THREAT. ATTM...IT APPEARS THAT STORMS
SHOULD INITIATE DURING THE AFTERNOON E OF A WEAK NNW-SSE BOUNDARY
EXTENDING FROM WRN SD SSEWD INTO THE CENTRAL KS VICINITY...AS THE
AIRMASS DESTABILIZES IN CONJUNCTION WITH PEAK HEATING. WITH A
CORRIDOR OF GREATER POTENTIAL FOR HAIL/WIND AND AN ISOLATED TORNADO
REASONABLY LIKELY TO EVOLVE...WILL INTRODUCE SLIGHT RISK ACROSS THE
NEB/MID MO VALLEY PORTION OF THE CENTRAL PLAINS REGION FOR DAY 3.

..GOSS.. 09/02/2012

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