Wednesday, March 27, 2013

DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 271228
SWODY1
SPC AC 271225

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0725 AM CDT WED MAR 27 2013

VALID 271300Z - 281200Z

...NO SVR TSTM AREAS FORECAST...

...SYNOPSIS...
MIDLEVEL TROUGH NEAR THE WA/ORE COASTS WILL DRIFT NEWD AND WEAKEN
TODAY AS LARGER-SCALE HEIGHT RISES OCCUR OVER THE GREAT
BASIN...DOWNSTREAM FROM THE NEXT AMPLIFYING TROUGH OVER THE ERN
PACIFIC. THE WA/ORE TROUGH WILL BE ACCOMPANIED BY SOMEWHAT RICHER
LOW-MIDLEVEL MOISTURE AND THE POTENTIAL FOR WEAK SURFACE-BASED
BUOYANCY THIS AFTERNOON. THE BUOYANCY IS EXPECTED TO EXTEND INTO
THE LAYER SUPPORTING MIXED PHASE PRECIPITATION /-15 TO -20C/...WHICH
MAY BE SUFFICIENT FOR ISOLATED LIGHTNING STRIKES.

OTHERWISE...A COOL/DRY CONTINENTAL AIR MASS WILL COVER MOST OF THE
CONUS E OF THE ROCKIES. SOME WARMING WILL OCCUR TODAY ACROSS THE
SRN PLAINS IN ASSOCIATION WITH WEAK LEE CYCLOGENESIS ACROSS W TX/ERN
NM. THIS WILL ALSO INDUCE WEAK MOISTURE RETURN FROM THE WRN
GULF...THOUGH MOISTENING/DESTABILIZATION WILL BE INSUFFICIENT FOR
ANY THUNDERSTORM RISK.

..THOMPSON/MOSIER.. 03/27/2013

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