SWODY1
SPC AC 150534
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1234 AM CDT TUE APR 15 2008
VALID 151200Z - 161200Z
..NO SVR TSTM AREAS FORECAST...
..SYNOPSIS...
STRONG UPPER TROUGH CURRENTLY MOVING INTO THE PACIFIC NW AND GREAT
BASIN WILL PROGRESS GENERALLY EWD THROUGH THE NRN AND CNTRL
ROCKIES...EVENTUALLY INTO THE NRN/CNTRL HIGH PLAINS TONIGHT INTO
WEDNESDAY MORNING. IN THE LOW LEVELS...ASSOCIATED COLD FRONT WILL
CONCURRENTLY MOVE EWD/SEWD THROUGH THE NRN PLAINS INTO UPPER MS
VALLEY...WITH SWRN EXTENSION OF FRONT PUSHING THROUGH THE CNTRL
ROCKIES INTO CNTRL HIGH PLAINS.
..NRN/CNTRL ROCKIES INTO NRN PLAINS...
15/00Z UPPER-AIR OBSERVATIONS FROM WA/ORE INDICATE THAT MIDLEVEL
TROUGH IS QUITE COLD WITH 500 MB TEMPERATURES OF -30 TO -33C. THE
EWD PROGRESSION OF THIS THERMAL TROUGH COUPLED WITH DIABATIC HEATING
SHOULD SUPPORT SIGNIFICANT STEEPENING OF LAPSE RATES TODAY WITH
POCKETS OF WEAK CONVECTIVE INSTABILITY DEVELOPING. ISOLATED TSTMS
WILL BE POSSIBLE BY THIS AFTERNOON BOTH ALONG FRONT AS WELL AS
WITHIN POST-FRONTAL AIR MASS AS HEIGHT FALLS/DYNAMIC FORCING
ASSOCIATED WITH UPPER SYSTEM OVERSPREAD DESTABILIZING BOUNDARY
LAYER.
THE GREATEST LIKLIHOOD OF A FEW TSTMS APPEARS TO BE OVER PORTIONS OF
WY AND SRN MT THIS AFTERNOON INTO EVENING WHERE AIR MASS IS FORECAST
TO BECOME SLIGHTLY MORE UNSTABLE. A FEW LIGHTNING STRIKES WILL BE
POSSIBLE EWD INTO THE DAKOTAS TONIGHT WHERE FORECAST SOUNDINGS
INDICATE A SMALL AMOUNT OF ELEVATED CONVECTIVE INSTABILITY N OF
SURFACE FRONT.
.MEAD.. 04/15/2008
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
To unsubscribe from WX-STORM send e-mail to LISTSERV@PO.UIUC.EDU with
"unsub wx-storm" in the body of your message. For more information write cnovy@cox.net.
No comments:
Post a Comment