Wednesday, April 18, 2012

DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 180838
SWOD48
SPC AC 180837

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0337 AM CDT WED APR 18 2012

VALID 211200Z - 261200Z

...DISCUSSION...
MEDIUM RANGE MODELS ARE IN BETTER AGREEMENT REGARDING THE UPPER
TROUGH THAT WILL TRANSLATE ACROSS THE GULF STATES THIS WEEKEND. AS
THE TROUGH DIGS ACROSS TX IT APPEARS SUBSTANTIAL FORCING WILL
OVERSPREAD THE WRN GULF BASIN EARLY IN THE DAY4 PERIOD AND A SQUALL
LINE SHOULD DEVELOP ALONG THE COLD FRONT. BOTH THE GFS AND ECMWF
INSIST THE UPPER TROUGH WILL MOVE INTO THE ERN GULF BY 12Z SUNDAY
MORNING WITH SUBSTANTIAL SHEAR EXPECTED TO OVERSPREAD THE FL
PENINSULA DURING THE OVERNIGHT HOURS DAY4. WITH 50-70+KT OF MID
LEVEL FLOW EXPECTED TO BE COLOCATED WITH THE WIND SHIFT IT WOULD
SEEM LIKELY THAT AN ORGANIZED MCS/SQUALL LINE COULD ADVANCE ACROSS
THE REGION.

..DARROW.. 04/18/2012

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