DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 311235
SWODY1
SPC AC 311233

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0633 AM CST MON DEC 31 2012

VALID 311300Z - 011200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
AN UPPER TROUGH WILL PROGRESS EASTWARD FROM THE SOUTHWEST U.S.
TOWARD THE SOUTHERN PLAINS THROUGH THE PERIOD. MEANWHILE...UPPER
RIDGE OVER THE EASTERN U.S. WILL FLATTEN AS CANADIAN TROUGH PIVOTS
SEWD ACROSS THE GREAT LAKES. THE RESULTING HEIGHT FALLS OVER THE
EASTERN U.S. WILL LEAD TO STRENGTHENING JET /100+ KT AT 500 MB/ FROM
CENTRAL TX TOWARD THE MID-ATLANTIC BY TUESDAY MORNING. AT THE
SFC...A COLD FRONT WILL ADVANCE SOUTHEAST ACROSS THE SOUTHERN PLAINS
AND MID-MS VALLEY...EXTENDING SOUTHWESTWARD FROM CENTRAL LA TO SOUTH
TEXAS BY 12Z TUESDAY. THUNDERSTORMS ARE EXPECTED TO DEVELOP IN MOIST
ASCENT OVER THIS BOUNDARY ACROSS PORTIONS OF SOUTHEASTERN TX AND
WESTERN LA LATE THIS EVENING INTO THE OVERNIGHT HOURS. THE
ELEVATED...MAINLY POST-FRONTAL STORMS WILL REMAIN IN A POOR LAPSE
RATE/WEAKLY UNSTABLE ENVIRONMENT. THEREFORE...NO ORGANIZED SEVERE
THREAT IS ANTICIPATED.

..LEITMAN/EDWARDS.. 12/31/2012

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