DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 280952
SWOD48
SPC AC 280951

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0351 AM CST SAT DEC 28 2013

VALID 311200Z - 051200Z

...DISCUSSION...
THE MEDIUM RANGE MODELS BEGIN THE DAY 4 TO 8 PERIOD WITH A SHORTWAVE
TROUGH ALONG THE EAST COAST EMBEDDED IN A LARGE-SCALE UPPER-LEVEL
TROUGH OVER THE CNTRL AND ERN U.S. THE MODELS MOVE THE SHORTWAVE
TROUGH INTO THE ATLANTIC ON TUESDAY/DAY 4 AND KEEP THE LARGE-SCALE
UPPER-LEVEL TROUGH IN PLACE THROUGH WEDNESDAY/DAY 5. AT THE SFC ON
WEDNESDAY...HIGH PRESSURE DOMINATES ACROSS THE CNTRL AND ERN STATES
IMPEDING MOISTURE RETURN. ON THURSDAY/DAY 6...THE GFS AND ECMWF
SOLUTIONS AMPLIFY THE LARGE-SCALE TROUGH WITH THE TROUGH MOVING EWD
INTO THE MS VALLEY. ON THURSDAY AND FRIDAY/DAY 7...NORTHWEST FLOW IN
THE CNTRL STATES WILL PROBABLY KEEP SFC HIGH PRESSURE IN PLACE
ACROSS MUCH OF THE ERN HALF OF THE NATION. THIS WEATHER PATTERN IN
THE DAY 4 TO 8 PERIOD APPEARS UNFAVORABLE FOR SEVERE THUNDERSTORMS.

..BROYLES.. 12/28/2013

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