ACUS01 KWNS 181223
SWODY1
SPC AC 181221
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0621 AM CST TUE DEC 18 2012
VALID 181300Z - 191200Z
...NO SVR TSTM AREAS FORECAST...
...COASTAL PAC NW...
OVERNIGHT IR IMAGERY INDICATES SHALLOW CELLULAR CONVECTION IS
ONGOING ALONG/W OF THE PACIFIC COAST...WITHIN A POCKET OF COLD
MIDLEVEL TEMPERATURES /E.G. AOB -30 C AT 500 MB PER 12Z REGIONAL
RAOBS/. MODEL FORECAST SOUNDINGS SUGGEST LITTLE IF ANY DIURNAL
HEATING WILL OCCUR TODAY DUE TO WIDESPREAD CLOUD COVER.
HOWEVER...STEEP LOW- AND MIDLEVEL LAPSE RATES WILL BE SUFFICIENT TO
YIELD SBCAPE VALUES UP TO 200 J/KG. FORCING FOR ASCENT ASSOCIATED
WITH THE CYCLONIC EXIT REGION OF AN OFFSHORE JET STREAK WILL SUPPORT
THE POTENTIAL FOR ISOLATED TSTMS THROUGH THE LATE
AFTERNOON...PRIMARILY CONFINED TO THE IMMEDIATE COASTAL AREAS OF SRN
WA...ORE...AND NRN CA. THE THREAT FOR TSTMS SHOULD DIMINISH AFTER
19/00Z AS MIDLEVEL WAA AND HEIGHT RISES OCCUR AHEAD OF A SHORTWAVE
UPPER RIDGE.
..ROGERS/EDWARDS.. 12/18/2012
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