DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 090957
SWOD48
SPC AC 090956

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0356 AM CST SUN DEC 09 2012

VALID 121200Z - 171200Z

...DISCUSSION...
MEDIUM RANGE MODELS CONTINUE TO INDICATE THAT A SIGNIFICANT SHORT
WAVE TROUGH...DIGGING ALONG THE PACIFIC COAST AT THE START OF THE
PERIOD...WILL INTERACT WITH A BELT OF WESTERLIES EMERGING FROM THE
SUBTROPICAL EASTERN PACIFIC...BEFORE TURNING EAST TOWARD THE CENTRAL
AND SOUTHERN PLAINS BY THE END OF THE COMING WORK WEEK. AS THIS
OCCURS...SIGNIFICANT MID/UPPER JET INTENSIFICATION APPEARS LIKELY
ACROSS MUCH OF THE CENTRAL AND SOUTHERN TIER OF THE U.S. TO THE EAST
OF THE ROCKIES...WITH THE JET LINGERING THROUGH NEXT WEEKEND INTO
THE EARLY PART OF THE FOLLOWING WEEK...WHILE ANOTHER VERY STRONG
MID-LATITUDE JET STREAK BEGINS TO NOSE INLAND ACROSS THE PACIFIC
COAST. ADDITIONAL AMPLIFYING SHORT WAVE IMPULSES ASSOCIATED WITH
THESE FEATURES MAY POSE POTENTIAL FOR STRONG SURFACE CYCLOGENESIS
WHICH COULD BECOME CAPABLE OF SUPPORTING A REGIONAL SEVERE WEATHER
EVENT...ANYWHERE FROM THE CENTRAL AND SOUTHERN PLAINS EASTWARD
THROUGH THE MID SOUTH AND GULF STATES AND MIDDLE/SOUTHERN ATLANTIC
SEABOARD. WHILE CONVECTIVE POTENTIAL APPEARS LIKELY TO
INCREASE...WITH AT LEAST A FEW RELATIVELY MINOR BOUTS OF POTENTIAL
SEVERE STORM DEVELOPMENT...PREDICTABILITY REMAINS TOO LOW TO
CONFIDENTLY ASCERTAIN AND DELINEATE A REGIONAL SEVERE RISK AREA.

..KERR.. 12/09/2012

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