SWODY1
SPC AC 201935
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0135 PM CST SUN DEC 20 2009
VALID 202000Z - 211200Z
...NO TSTM AREAS FORECAST...
...SYNOPSIS...
AN ISOLATED THUNDERSTORM REMAINS POSSIBLE ACROSS IMMEDIATE COASTAL
SECTIONS OF WA/OREGON/NRN CA THIS PERIOD...AS A PAIR OF UPPER
SHORT-WAVE TROUGHS CROSS THE REGION THROUGH THE END OF THE PERIOD.
HOWEVER...POTENTIAL COVERAGE CONTINUES TO APPEAR LIMITED...THUS
PRECLUDING A THUNDER LINE THIS FORECAST.
..GOSS.. 12/20/2009
.PREV DISCUSSION... /ISSUED 0933 AM CST SUN DEC 20 2009/
...PACIFIC NW REGION...
A SERIES OF SHORT WAVE TROUGHS ARE FORECAST TO MOVE ONSHORE FROM THE
ERN PACIFIC ACROSS THE PACIFIC NORTHWEST. FRONTAL BAND ASSOCIATED
WITH THE INITIAL SHORT WAVE IS CURRENTLY EXTENDING ACROSS WRN PARTS
OF WA AND OREGON SWD ALONG THE NWRN CA COAST...AND ISOLATED CG
LIGHTNING STRIKES HAVE BEEN INDICATED OFF CAPE MENDOCINO WITHIN THE
SRN PART OF THE BAND. SATELLITE IMAGERY ALSO SHOWS CELLULAR
CONVECTION ASSOCIATED WITH THE PRIMARY VORTICITY MAX NEAR 43N/133W
BUT NO LIGHTNING HAS BEEN INDICATED WITH THIS CONVECTION. 12Z
REGIONAL SOUNDINGS EXHIBIT VERY LIMITED INSTABILITY...AND ONLY WEAK
COOLING ALOFT IS EXPECTED TO MOVE ONSHORE LATE TONIGHT AS THE SECOND
SYSTEM APPROACHES THE COAST. ALTHOUGH AN ISOLATED THUNDERSTORM IS
POSSIBLE OVER THE COASTAL WATERS AND IMMEDIATE COASTAL SECTIONS OF
WA/OREGON/NRN CA...OVERALL THREAT APPEARS TOO LIMITED TO JUSTIFY A
THUNDERSTORM AREA.
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