Several of you have asked about a potential snowstorms tonight...particularly since the NWS discussion seems to be threatening one due to an errant "deformation zone." Anyway, I just don't see it. There could be a snowstorm..but that will be over SW Washington and Portland--perhaps extending into the very SE suburbs of Seattle. The latest satellite picture shows the low offshore of Oregon (look for the tight swirl in the infrared satellite picture). This low appears to be somewhat more intense than forecast...but it does seem to be going in well south of us..as the models indicated. The precipitation shield is south of Seattle and should stay that way with the low's trajectory. With heavier precipitation to our south and northerly winds wrapping around the low bringing in cooler air behind...the Portland area and the SW WA corner could see snow (see 24 hr snow predictions ending 4 PM tomorrow afternoon) and perhaps a significant amount. That is certainly true above 500 ft.
The low will move westward tomorrow morning and cooler, drier air will move in behind. But I hate to say it, there is another snow threat tomorrow night as a weak disturbance moves in while we have cold air in place. Will check that out tomorrow...but the city should get the salt ready!