Severe Storm Outlook Narrative (AC)
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000
ACUS03 KWNS 280654
SWODY3
SPC AC 280653

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1253 AM CST SUN DEC 28 2014

VALID 301200Z - 311200Z

...NO TSTM AREAS FORECAST...

...SUMMARY...
THUNDERSTORMS ARE QUITE IMPROBABLE OVER THE CONTINENTAL U.S. ON DAY
THREE.

...SYNOPSIS...
BY 30/12Z...LEADING SHORTWAVE TROUGH DISCUSSED IN DAY-2 OUTLOOK WILL
BE MOVING EWD ACROSS SRN MO.  HEIGHTS WILL FALL OVER UPPER
MIDWEST...SE OF SEPARATE PERTURBATION MOVING OUT OF CANADIAN
PRAIRIES...CONTRIBUTING TO CONTINUED WEAKENING AND FAST EWD MOVEMENT
OF LEADING TROUGH OFFSHORE MID-ATLC REGION BY 06Z.
MEANWHILE...ZONALLY ELONGATED 500-MB CYCLONE WILL BEGIN DAY-3 NEAR
NRN NV BORDER.  WHILE MINOR/MESOSCALE DIFFERENCES ARE APPARENT IN
PROGS BY LATTER HALF OF PERIOD...THIS LOW IS EXPECTED TO DEEPEN
SOMEWHAT WHILE RETROGRADING SWWD...REACHING CENTRAL OR PERHAPS SRN
CA BY 31/12Z.  DESPITE ASSOCIATED COLD AIR ALOFT...LOW-LEVEL THETAE
SHOULD BE TOO WEAK TO SUPPORT GEN TSTM POTENTIAL WITH THIS FEATURE.

MEANWHILE...WEAK LOW-LEVEL FRONT LOCATED OVER PORTIONS GA AND NRN FL
AT START OF PERIOD SHOULD MOVE SEWD DOWN FL PENINSULA AND OFFSHORE
REMAINDER ATLC COAST.  FRONTAL LIFT AND LAPSE RATES ALOFT EACH
SHOULD BE TOO WEAK TO SUPPORT TSTM DEVELOPMENT OVER LAND.  VERY
LARGE POSTFRONTAL SFC ANTICYCLONE WILL COVER INTERVENING PARTS OF
CONUS...RENDERING AIR MASS TOO DRY/STABLE FOR TSTMS.

..EDWARDS.. 12/28/2014



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