SWODY1
SPC AC 261244
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0744 AM CDT SUN OCT 26 2008
VALID 261300Z - 271200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
A DEEP COLD TROUGH WILL DIG SEWD FROM THE DAKOTAS/MN TO THE OH
VALLEY BY EARLY MONDAY...WHILE A PRONOUNCED MID LEVEL RIDGE PERSISTS
OVER THE GREAT BASIN. A COLD FRONT ACCOMPANYING THE DEEP TROUGH
WILL SWEEP EWD ACROSS THE GREAT LAKES TODAY AND SWD ACROSS THE SRN
PLAINS/LOWER MS VALLEY THROUGH TONIGHT. LOW-LEVEL MOISTURE WILL BE
QUITE LIMITED ACROSS THE MAJORITY OF THE CONUS E OF THE ROCKIES AS A
RESULT OF OFFSHORE FLOW IN THE WAKE OF A WEAK COLD FRONT OFF THE
ATLANTIC AND GULF COASTS. SOME MOISTURE RETURN WILL OCCUR FROM S
INTO CENTRAL TX IN ADVANCE OF THE COLD FRONT ADVANCING SWD ACROSS
THE SRN PLAINS...BUT ONLY MARGINAL INSTABILITY AND SHALLOW ASCENT
ALONG THE FRONT SHOULD LIMIT THE THREAT FOR THUNDERSTORMS.
A SOMEWHAT GREATER RISK FOR THUNDERSTORMS IS EXPECTED ACROSS THE
GREAT LAKES REGION TODAY AS THE COLD MID LEVEL TROUGH OVERSPREADS
THE AREA. STEEP LOW-MID LEVEL LAPSE RATES AND BOUNDARY LAYER
DEWPOINTS OF 38-42 F SHOULD BE SUFFICIENT FOR ISOLATED LOW-TOPPED
THUNDERSTORMS DURING THE DAY. SOME BOUNDARY LAYER
MODIFICATION/DESTABILIZATION MAY ALSO OCCUR OVER AND IN THE LEE OF
THE RELATIVELY WARM LAKES...AND THE STRONGER CONVECTION COULD
PRODUCE SOME SMALL HAIL OR GRAUPEL THIS AFTERNOON. STILL...LIMITED
INSTABILITY SUGGESTS THAT THE THREAT FOR SEVERE HAIL WILL BE
MINIMAL.
..THOMPSON/GRAMS.. 10/26/2008
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
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