SWODY1
SPC AC 190534
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1234 AM CDT TUE MAY 19 2009
VALID 191200Z - 201200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
A MID-/UPPER-LEVEL TROUGH IS FORECAST TO MOVE SLOWLY EWD ACROSS THE
NWRN U.S. THIS PERIOD...WHILE A WEAKER LOW DRIFTS EWD ACROSS THE ERN
PACIFIC TOWARD SRN CA. DOWNSTREAM...A RIDGE ALOFT SHOULD DRIFT FROM
THE CENTRAL INTO THE ERN CONUS...WHILE AN UPPER LOW LINGERS OVER FL
THROUGH THE PERIOD.
AT THE SURFACE...A COLD FRONT IS FORECAST TO MOVE ACROSS THE NWRN
QUARTER OF THE CONUS...IN CONJUNCTION WITH THE PROGRESSING UPPER
TROUGH. THIS FRONT -- AND THE ASSOCIATED UPPER TROUGH -- WILL
SUPPORT CONVECTIVE DEVELOPMENT AND AN ISOLATED/LOW-END SEVERE THREAT
ACROSS THE NRN INTERMOUNTAIN REGION.
...MT SWD ACROSS SERN ID/WRN WY INTO NRN UT...
SHOWERS AND ISOLATED THUNDERSTORMS ARE FORECAST TO DEVELOP ACROSS
PARTS OF THE WEST...AS AN UPPER TROUGH AND ASSOCIATED HEIGHT FALLS
SPREAD ACROSS THE REGION THROUGH THE DAY. WHILE LIMITED LOW-LEVEL
MOISTURE WILL YIELD ONLY MODEST DESTABILIZATION...ISOLATED STRONGER
CELLS MAY DEVELOP INVOF THE SURFACE FRONT AS IT CROSSES MT/ERN
ID/WRN WY/NRN UT...AIDED BY STRONG DEEP-LAYER WIND FIELD ON SERN
PORTIONS OF THE ADVANCING UPPER TROUGH. COVERAGE OF THE THREAT
SHOULD REMAIN LOW...BUT LOCALLY-GUSTY/DAMAGING WINDS MAY OCCUR --
AIDED BY THE POTENTIAL FOR EVAPORATION WITHIN DEEP/DRY SUB-CLOUD
LAYER. THREAT SHOULD SPREAD EWD ACROSS MT INTO THE
EVENING...FOLLOWED BY AN OVERALL DECREASE IN STORM INTENSITY WITH
TIME WITH THE LOSS OF DIURNAL HEATING.
..GOSS/GRAMS.. 05/19/2009
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
To unsubscribe from WX-STORM send e-mail to LISTSERV@LISTSERV.ILLINOIS.EDU with
"unsub wx-storm" in the body of your message. For more information write cnovy@cox.net.
No comments:
Post a Comment