Wednesday, December 28, 2011

DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 281921
SWODY1
SPC AC 281919

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0119 PM CST WED DEC 28 2011

VALID 282000Z - 291200Z

...NO TSTM AREAS FORECAST...

NO CHANGES TO PREVIOUS OUTLOOK.

..JEWELL.. 12/28/2011

.PREV DISCUSSION... /ISSUED 0934 AM CST WED DEC 28 2011/

...SYNOPSIS...
A LOW AMPLITUDE UPPER-LEVEL SHORTWAVE TROUGH WILL MOVE EWD ACROSS
THE PAC NW TONIGHT. COLD MIDLEVEL TEMPERATURES /AOB -25C AT 500 MB/
ACCOMPANYING THIS FEATURE WILL LEAD TO STEEPENING LAPSE RATES...AND
AID IN THE DEVELOPMENT OF WEAK MUCAPE VALUES /NEAR 100 J PER KG/
ACROSS PORTIONS OF WA. THIS ENVIRONMENT MAY FAVOR ISOLATED LIGHTNING
STRIKES...BUT COVERAGE WILL BE TOO LOW TO INITIATE A THUNDER
DELINEATION. ELSEWHERE...A DRY STABLE AIRMASS WILL PRECLUDE
THUNDERSTORM DEVELOPMENT ACROSS THE CNTRL AND ERN CONUS.

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