SWODY1
SPC AC 041620
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1120 AM CDT TUE SEP 04 2007
VALID 041630Z - 051200Z
..NO SVR TSTM AREAS FORECAST...
..ID/NV/UT...
MORNING SATELLITE IMAGERY SHOWS POWERFUL UPPER TROUGH DIGGING
SOUTHEASTWARD ACROSS ORE/NORTHERN CA. THIS SYSTEM WILL MOVE INTO NV
TONIGHT...WITH BAND OF MODERATELY STRONG MID LEVEL WINDS EXTENDING
ACROSS NV/UT AND INTO SOUTHERN ID BY EVENING. VISIBLY IMAGERY AND
RADAR SHOW WIDESPREAD CLOUDS AND SHOWERS THIS MORNING FROM NORTHEAST
NV INTO EASTERN ID. THIS WILL LIMIT DIABATIC HEATING THROUGH MUCH
OF THE DAY. HOWEVER...MID LEVEL DRYING IS INDICATED BY WATER VAPOR
IMAGERY OVER NORTHEAST NV. THIS DRYING WILL LIKELY SPREAD EASTWARD
BY LATE AFTERNOON AND HELP TO DIMINISH CLOUD COVER OVER PARTS OF THE
REGION. THOSE AREAS WHERE HEATING CAN OCCUR WILL BECOME AT LEAST
MARGINALLY UNSTABLE WITH STEEP LOW LEVEL LAPSE RATES AND RATHER
LARGE SURFACE T-TD SPREADS. SCATTERED AFTERNOON THUNDERSTORMS MAY
DEVELOP OVER PARTS OF NORTHERN NV/UT INTO EASTERN ID WITH A RISK OF
GUSTY WINDS AND HAIL. TIMING OF UPPER SYSTEM...MORNING CLOUDS...AND
LACK OF STRONG INSTABILITY SUGGEST THAT SEVERE THREAT WILL REMAIN
LIMITED IN COVERAGE AND INTENSITY. THUS WILL MAINTAIN ONLY LOW
SEVERE PROBABILITIES AT THIS TIME.
..EASTERN ORE...
RELATIVELY CLEAR SKIES ARE EVIDENT THIS MORNING OVER EASTERN ORE.
UPPER LOW IS FORECAST TO MOVE INTO THIS AREA BY AFTERNOON...
RESULTING IN STEEPENING MID LEVEL LAPSE RATES AND UPWARD FORCING FOR
VERTICAL MOTION. SCATTERED THUNDERSTORMS ARE LIKELY TO DEVELOP BY
MID-LATE AFTERNOON. FORECAST SOUNDINGS SUGGEST THE POTENTIAL FOR
PULSE STORMS CAPABLE OF HAIL AND GUSTY WINDS. THREAT SHOULD
DIMINISH QUICKLY AFTER SUNSET.
.HART/GUYER.. 09/04/2007
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