SWODY1
SPC AC 201931
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0131 PM CST THU NOV 20 2008
VALID 202000Z - 211200Z
...NO SVR TSTM AREAS FORECAST...
...PAC NW...
LIGHTNING DATA INDICATED LATE MORNING TSTMS ALONG AND JUST INLAND OF
THE SW ORE COAST...AND ALSO JUST OFFSHORE THE SW WA COAST. THIS
ACTIVITY IS LOCATED BENEATH A COLD POOL ALOFT /-22 TO -26 C AT 500
MB PER OBJECTIVE ANALYSES/ ATTENDANT TO THE PROGRESSIVE SHORT WAVE
TROUGH MOVING EWD INTO WA/ORE. THE THREAT FOR TSTMS IS EXPECTED TO
PERSIST THROUGH THE AFTERNOON FROM OFFSHORE TO JUST INLAND OF THE
WA/ORE COAST WHERE THE AIR MASS SHOULD REMAIN UNSTABLE GIVEN GREATER
LOW LEVEL MOISTURE /SURFACE DEWPOINTS IN THE UPPER 40S/ AND SURFACE
HEATING BENEATH THE COLD MID LEVEL TEMPERATURES. THIS THREAT WILL
DIMINISH DURING THE EVENING AS HEIGHTS RISE/MID LEVELS WARM IN THE
WAKE OF THE TROUGH MOVING FARTHER INLAND.
..PETERS.. 11/20/2008
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