SWODY1
SPC AC 210035
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0735 PM CDT SAT SEP 20 2008
VALID 210100Z - 211200Z
...NO SVR TSTM AREAS FORECAST...
...NRN UT/SW WY/SE ID...
A NEGATIVELY TILTED UPPER-LEVEL TROUGH OVER THE PACIFIC NORTHWEST
WILL CONTINUE TO MOVE NEWD AS A 40 TO 50 KT MID-LEVEL JET EJECTS OUT
OF THE BASE OF THE TROUGH ACROSS THE INTERMOUNTAIN WEST. STRONG
LARGE-SCALE ASCENT ASSOCIATED WITH THE UPPER-LEVEL TROUGH AND SFC
HEATING IS RESULTING IN NUMEROUS THUNDERSTORMS ACROSS THE REGION.
THE SALT LAKE CITY 00Z SOUNDING SHOWS ABOUT 1000 J/KG OF MUCAPE WITH
40 KT OF 0-6 KM SHEAR WHICH SHOULD BE SUFFICIENT FOR MARGINALLY
SEVERE STORMS. THIS ALONG WITH 850 TO 500 MB LAPSE RATES EXCEEDING
8.0 C/KM AND 500 MB TEMPS IN THE -12 TO -14C RANGE SHOULD BE
SUPPORTIVE OF A HAIL THREAT WITH THE MORE INTENSE CELLS EARLY THIS
EVENING. STEEP LOW-LEVEL LAPSE RATES AND THE RELATIVELY DRY BOUNDARY
LAYER MAY ALSO RESULT IN A FEW STRONG WIND GUSTS AS WELL.
..BROYLES.. 09/21/2008
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