[SWODY2] SWODY2

[Severe Weather Outlook - Day 2]

ACUS02 KWNS 210632
SWODY2
SPC AC 210630

DAY 2 CONVECTIVE OUTLOOK  
NWS STORM PREDICTION CENTER NORMAN OK
1230 AM CST WED FEB 21 2007

VALID 221200Z - 231200Z

...NO SVR TSTM AREAS FORECAST...

...WEST COAST...
A VIGOROUS UPPER-LEVEL TROUGH WILL MOVE INLAND ACROSS THE WRN U.S.
THURSDAY. STRONG LARGE-SCALE ASCENT AND STEEP LAPSE RATES WITH THIS
SYSTEM WILL PROMOTE THE DEVELOPMENT OF THUNDERSTORMS FROM WRN ORE
SWD TO THE CNTRL CA COAST. THE GREATEST INSTABILITY IS FORECAST TO
BE IN WRN ORE AND WRN WA AND FORECAST SOUNDINGS SHOW LAPSE RATES
NEAR 8.0 C/KM IN THIS REGION. THE STEEP LAPSE RATES COMBINED WITH
ENHANCED LARGE-SCALE ASCENT IN THE CORE OF THE UPPER-LEVEL TROUGH
MAY PROMOTE THE DEVELOPMENT OF MARGINALLY SEVERE HAILSTORMS THURSDAY
AND THURSDAY NIGHT MAINLY ALONG THE PACIFIC NORTHWEST COAST.

...SRN PLAINS...
AN UPPER-LEVEL RIDGE OVER THE ROCKIES TONIGHT WILL MOVE EWD INTO THE
PLAINS THURSDAY. A SHORTWAVE TROUGH OVER SWRN AZ WILL MOVE QUICKLY
ENEWD AND BECOME SUPERIMPOSED IN THE RIDGE OVER THE SRN PLAINS AND
CNTRL HIGH PLAINS THURSDAY NIGHT. IN RESPONSE TO WSWLY FLOW AND
FALLING HEIGHTS IN THE WRN U.S...A STRONG LOW-LEVEL JET WILL DEVELOP
OVER THE PLAINS AND LOW-LEVEL MOISTURE WILL BEGIN TO ADVECT NWD
ACROSS TX AND OK THURSDAY NIGHT. LARGE-SCALE ASCENT ASSOCIATED WITH
SHORTWAVE TROUGH COMBINED WITH LIFT FROM THE LOW-LEVEL JET MAY BE
ENOUGH FOR ELEVATED MOIST CONVECTION OVER OK AND NRN TX. 
HOWEVER...THE THUNDERSTORM POTENTIAL APPEARS QUITE MARGINAL ATTM.

..BROYLES.. 02/21/2007