Thursday, March 19, 2009

DAY2SVR: Nws Storm Prediction Center Norman Ok

ACUS02 KWNS 190551
SWODY2
SPC AC 190549

DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1249 AM CDT THU MAR 19 2009

VALID 201200Z - 211200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
AN UPPER TROUGH WILL CONTINUE VACATING THE ERN U.S. WHILE A SECOND
TROUGH APPROACHES THE WEST...WITH MUCH OF THE CENTRAL CONUS UNDER
THE INFLUENCE OF AN UPPER RIDGE THIS PERIOD. AT THE SURFACE...A
COLD FRONT SHOULD MOVE SLOWLY SEWD ACROSS THE PAC NW...WITH LEE
TROUGHING TO EVOLVE OVER THE HIGH PLAINS THROUGH THE SECOND HALF OF
THE PERIOD. ELSEWHERE...A LARGE AREA OF HIGH PRESSURE WILL PREVAIL
ACROSS THE ERN HALF OF THE CONUS.

...PARTS OF THE GREAT BASIN INTO THE CENTRAL/SRN ROCKIES...
WEAK SRN STREAM TROUGH IS FORECAST TO MOVE NEWD ACROSS THE GREAT
BASIN/ROCKIES THROUGH THE SECOND HALF OF THE PERIOD...WITH THE
RESULTING COOLER TEMPERATURES ALOFT/STEEPENING LAPSE RATES YIELDING
MINIMAL INSTABILITY. WHILE SHOWERS AND A FEW THUNDERSTORMS ARE
FORECAST ACROSS THIS AREA...WEAK THERMODYNAMIC ENVIRONMENT PRECLUDES
APPRECIABLE SEVERE THREAT.

...S FL...
WEAK LAPSE RATES/MINIMAL INSTABILITY AND LINGERING CYCLONIC FLOW
ALOFT COULD SUPPORT SHOWERS AND AN ISOLATED/DIURNAL STORM OR TWO
ACROSS PARTS OF S FL.

..GOSS.. 03/19/2009

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