SWODY1
SPC AC 301243
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0743 AM CDT WED APR 30 2008
VALID 301300Z - 011200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
SRN BC UPR LOW EXPECTED TO REDEVELOP SE INTO CNTRL CO BY THE END OF
THE PERIOD IN RESPONSE TO STRONG JET STREAK NOW MOVING SE ACROSS
WA/ORE. AS THIS OCCURS...LEE CYCLONE NOW OVER WRN SD SHOULD REFORM
S INTO NE CO THIS EVENING...BEFORE CONTINUING E/NE INTO S CNTRL NEB
EARLY THURSDAY.
...NRN HI PLNS...
AN ENVIRONMENT SIMILAR TO THAT WHICH SUPPORTED WIND-PRODUCING TSTMS
OVER CNTRL MT YESTERDAY WILL DEVELOP OVER ERN WY/NE CO AND WRN NEB
THIS AFTN AS SFC HEATING RESULTS IN LOW-LVL DESTABILIZATION NEAR
CREST OF WARM SECTOR OF DEEPENING LEE CYCLONE. DEEPLY-MIXED
BOUNDARY LAYER...COUPLED WITH LARGE TEMPERATURE-DEWPOINT SPREADS AND
CONVERGENCE INVOF LEE TROUGH/LOW...WILL ONCE AGAIN BE FAVORABLE FOR
SCTD AFTN STORMS WITH A THREAT FOR LOCALLY DMGG WIND GUSTS. COLD
FRONT NOW MOVING SE INTO NRN WY SHOULD MARK THE WRN EDGE OF THIS
THREAT.
LARGE SCALE ASCENT WILL INCREASE OVER THE CNTRL AND NRN HI PLNS
TONIGHT AND EARLY THURSDAY AS UPR LOW REDEVELOPS SE ACROSS THE NRN
GRT BASIN/CNTRL RCKYS. AT THE SAME TIME...DEEP FRONTAL ZONE
ASSOCIATED WITH THE UPR SYSTEM WILL ADVANCE E TO THE HI PLNS AND
OVERTAKE/MERGE WITH PREVIOUSLY-MENTIONED SHALLOWER FRONT MOVING INTO
ERN WY TODAY. THIS SETUP SHOULD LEAD TO EXPANDING COVERAGE OF
ELEVATED CONVECTION/STORMS...ESPECIALLY FROM ERN WY INTO WRN SD.
MOISTURE WILL BE SPARSE...WITH REGION REMAINING WELL REMOVED FROM
SUBSTANTIAL GULF INFLOW. BUT STEEP MID LVL LAPSE RATES OF RESIDUAL
EML MAY YIELD STORMS WITH MARGINALLY SVR HAIL DURING THEIR EARLY
STAGES OF DEVELOPMENT.
..CORFIDI/CROSBIE.. 04/30/2008
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