SWODY2
SPC AC 151727
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1227 PM CDT SAT SEP 15 2007
VALID 161200Z - 171200Z
..NO SVR TSTM AREAS FORECAST...
..INTERMOUNTAIN WEST...
AN UPPER-LEVEL LOW CENTERED OFF THE NRN CA COAST WILL OPEN UP AND
MOVE EWD INTO THE SWRN U.S. TONIGHT INTO SUNDAY. SLY FLOW ACROSS THE
REGION WILL INCREASE AS THE SYSTEM APPROACHES AND AN AXIS OF
INSTABILITY SHOULD BE LOCATED ACROSS AZ AND UT. SFC HEATING AND LIFT
AHEAD OF THE APPROACHING TROUGH SHOULD SUPPORT NUMEROUS
THUNDERSTORMS ACROSS AZ...UT AND WRN CO SUNDAY AFTERNOON. STEEP
MID-LEVEL LAPSE RATES...COLD AIR ALOFT AND MODERATE TO STRONG
VERTICAL SHEAR ON FORECAST SOUNDINGS SHOULD BE SUFFICIENT FOR A
MARGINAL HAIL THREAT WITH THE STRONGER CELLS. WIND DAMAGE WILL ALSO
BE POSSIBLE FROM NRN AZ ACROSS CNTRL AND ERN UT WHERE FORECAST
SOUNDINGS SHOW INVERTED-V PROFILES. THE MAIN THREAT ACROSS SCNTRL AZ
ALTHOUGH MARGINAL MAY BE ISOLATED WIND DAMAGE WHERE LOW-LEVEL
MOISTURE AND INSTABILITY WILL BE GREATER THAN AREAS FURTHER NORTH.
.BROYLES.. 09/15/2007
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