SWODY1
SPC AC 210059
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0759 PM CDT TUE APR 20 2010
VALID 210100Z - 211200Z
..NO SVR TSTM AREAS FORECAST...
..WRN TX...
SUPERCELL W/SW OF AMA CONTINUES TO PROPAGATE SSEWD ALONG N-S
ORIENTED BAROCLINIC ZONE WITHIN A THERMODYNAMIC ENVIRONMENT
CHARACTERIZED BY STEEP LAPSE RATES AND MUCAPE OF AROUND 1000 J/KG.
WHILE THE WIND FIELD IS NOT PARTICULARLY STRONG...THE SWD STORM
PROPAGATION IS ENHANCING NEAR GROUND SRH WITHIN THE STORM INFLOW.
THE GRADUAL INTENSIFICATION OF A 35+ KT SLY LLJ SHOULD SERVE TO
ENHANCE MESOSCALE ASCENT ALONG DEVELOPING CONVECTIVE
OUTFLOWS...ALLOWING FOR A CONTINUATION OF ONGOING STORM CLUSTER
THROUGH THE SRN TX PNHDL...PERHAPS INTO PARTS OF THE S PLAINS AND
LOW ROLLING PLAINS. THE PRIMARY HAZARD WILL BE DAMAGING WIND
GUSTS...THOUGH HAIL AND PERHAPS A BRIEF TORNADO WILL REMAIN POSSIBLE
FOR THE NEXT HOUR OR TWO.
..ERN ORE/WRN WA...
AN ARCING BAND OF TSTMS HAS DEVELOPED THIS AFTERNOON FROM VICINITY
OF MIGRATORY SURFACE LOW W OF BOI SSEWD ALONG PACIFIC FRONT INTO
NERN NV. A PRONOUNCED PRESSURE RISE-FALL COUPLET ASSOCIATED WITH
THE SURFACE LOW IS INDICATIVE OF STRONG DYNAMIC FORCING FOR ASCENT
ATTENDANT TO A VIGOROUS SHORT WAVE TROUGH ROTATING AROUND PARENT
UPPER LOW INTO CNTRL NV. 00Z BOI SOUNDING IS LIKELY QUITE
REPRESENTATIVE OF THE AMBIENT ENVIRONMENT...FEATURING STEEP LAPSE
RATES AND A DEEPLY MIXED...INVERTED-V TYPE SUB-CLOUD PROFILE. THE
COMBINATION OF EVAPORATIVE COOLING EFFECTS AND DOWNWARD MOMENTUM
TRANSFER OF A STRONG WIND FIELD WILL CONTINUE TO FAVOR THE
DEVELOPMENT OF ISOLATED STRONG DOWNBURSTS THROUGH THE REMAINDER OF
THE EVENING.
.MEAD.. 04/21/2010
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