Sunday, November 27, 2011

DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 270926
SWOD48
SPC AC 270926

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0326 AM CST SUN NOV 27 2011

VALID 301200Z - 051200Z

...DISCUSSION...
IN THE WAKE OF THE ERN CONUS UPPER-LEVEL TROUGH...AN EXTENSIVE
SURFACE RIDGE SHOULD BECOME ANCHORED ACROSS THE CNTRL AND EVENTUALLY
ERN CONUS THROUGH MUCH OF THE PERIOD. WITH A CP AIR MASS ENTRENCHED
ACROSS THE GULF REGION...SEVERE POTENTIAL APPEARS TO BE NEGLIGIBLE
FOR SEVERAL DAYS. TOWARDS NEXT WEEKEND...DESPITE LARGE SPREAD WITHIN
GUIDANCE...TSTM POTENTIAL MAY INCREASE ACROSS PARTS OF THE SRN
PLAINS/WRN GULF COAST WITH APPROACH OF AN UPPER-LEVEL TROUGH IN THE
WRN CONUS. HOWEVER...THE ANTECEDENT AIR MASS APPEARS UNLIKELY TO
SUPPORT 30 PERCENT OR GREATER SEVERE PROBABILITIES.

..GRAMS.. 11/27/2011

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