Monday, October 24, 2011

DAY3SVR: Nws Storm Prediction Center Norman Ok

ACUS03 KWNS 240721
SWODY3
SPC AC 240720

DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0220 AM CDT MON OCT 24 2011

VALID 261200Z - 271200Z

...SYNOPSIS...
A PROGRESSIVE/SPLIT UPPER FLOW REGIME SEEMS LIKELY ON WEDNESDAY
ESPECIALLY OVER THE WESTERN/CENTRAL CONUS. WHILE AMPLE NUMERICAL
GUIDANCE VARIABILITY EXISTS REGARDING THE DETAILS...IT IS LIKELY
THAT A SHORTWAVE TROUGH WILL AMPLIFY/SPREAD SOUTHEASTWARD OVER THE
UPPER MIDWEST ON WEDNESDAY...WITH A SOUTHERN STREAM IMPULSE CROSSING
THE SOUTHWEST STATES/FAR NORTHWEST MEXICO. A SOUTHWEST-NORTHEAST
ORIENTED COLD FRONT IS EXPECTED TO GENERALLY SPREAD SOUTHEASTWARD
THROUGH THE PERIOD ACROSS PORTIONS OF THE OH/TN VALLEYS AND THE
LOWER MS VALLEY/ARKLATEX ALONG WITH MUCH OF TX.

CURRENT THINKING IS THAT SCATTERED SHOWERS/TSTMS WILL PERSIST DURING
THE DAY ALONG/AHEAD OF THIS FRONT ACROSS THE OZARKS AND LOWER OH/TN
RIVER VALLEYS...WITH ADDITIONAL TSTM DEVELOPMENT POSSIBLE LATER IN
THE AFTERNOON AND MORE SO WEDNESDAY NIGHT WITHIN A CORRIDOR ACROSS
THE ARKLATEX/PORTIONS OF TX AND PERHAPS OK. WHILE A FEW STRONG
STORMS MAY BE POSSIBLE NEAR THE FRONT WITHIN A CORRIDOR FROM THE
ARKLATEX TO THE LOWER OH VALLEY...SEVERE POTENTIAL SHOULD GENERALLY
BE LIMITED BY MODEST MOISTURE AND WEAK /OR AT LEAST UNCERTAIN/
NEAR-FRONTAL/WARM SECTOR DESTABILIZATION.

..GUYER.. 10/24/2011

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