SWODY2
SPC AC 200557
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1257 AM CDT TUE MAY 20 2008
VALID 211200Z - 221200Z
...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF ERN WY/SWRN
SD/THE NEB PANHANDLE...
...SYNOPSIS...
UPPER TROUGH OVER THE WRN U.S. IS FORECAST TO CONTINUE DIGGING SEWD
ACROSS THE FOUR CORNERS REGION...SUBSEQUENTLY RESULTING IN
AMPLIFICATION OF THE CENTRAL U.S. RIDGE AS A DOWNSTREAM VORTEX
REMAINS ANCHORED OVER THE NERN U.S./ERN CANADA.
AS THE WRN TROUGH DIGS SEWD...SURFACE LOW IS FORECAST TO
STRENGTHEN/SHIFT SLOWLY SEWD INTO ERN CO WITH TIME. ALONG WITH A
COLD FRONT TRAILING FROM THIS LOW WHICH WILL CONTINUE MOVING SEWD
ACROSS THE WEST...A SECOND BAROCLINIC ZONE SHOULD EXTEND FROM THIS
LOW SEWD ACROSS THE CENTRAL/SRN PLAINS AND ON INTO THE SOUTHEAST
U.S. THROUGH THE PERIOD.
...CENTRAL/NRN HIGH PLAINS REGION...
WITH A SURFACE LOW FORECAST OVER NRN CO...ELY/SELY LOW-LEVEL FLOW
E/NE OF THE LOW MAY RESULT IN AMPLE UPSLOPE-INDUCED UVV FOR
AFTERNOON CONVECTIVE DEVELOPMENT OVER PORTIONS OF THE HIGH PLAINS.
THOUGH INSTABILITY IS FORECAST TO DECREASE NWD TOWARD MT...AND
CAPPING SHOULD HINDER ANY DEVELOPMENT EWD AWAY FROM THE HIGHER
TERRAIN...A SMALL ZONE OF FAVORABLE INSTABILITY AND SHEAR APPEARS TO
EXIST ACROSS PARTS OF ERN WY AND INTO THE NEB PANHANDLE/SWRN SD TO
WARRANT THE CONTINUATION OF A SMALL SLIGHT RISK AREA.
...NEB AND VICINITY...
SHOWERS AND THUNDERSTORMS MAY SPREAD EWD INTO -- OR DEVELOP OVER --
PORTIONS OF NEB AND PERHAPS INTO THE MID MO VALLEY REGION
OVERNIGHT...AS NOCTURNAL SLY LOW-LEVEL JET DEVELOPS. WITH STEEP
LAPSE RATES ALOFT EXPECTED TO RESIDE OVER THE PLAINS...MOISTENING
ABOVE A LOWER-LEVEL INVERSION SHOULD RESULT IN AMPLE CAPE FOR A FEW
STRONGER CELLS -- AND THUS A LOW-PROBABILITY THREAT FOR HAIL.
...SRN GA/NRN FL...
A FEW SHOWERS AND THUNDERSTORMS ARE FORECAST ACROSS THE GULF COAST
REGION...INVOF LINGERING/W-E COLD FRONT. WHILE STORM COVERAGE
SHOULD REMAIN LIMITED...AMPLE INSTABILITY AND MODERATELY-STRONG FLOW
ALOFT SUGGESTS A POTENTIAL FOR A FEW STRONGER STORMS DURING THE
AFTERNOON -- AND THUS A LIMITED THREAT FOR LOCALLY-DAMAGING
WINDS/HAIL.
..GOSS.. 05/20/2008
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