Snow likely for weekend (evening edition)

First off let we say that the map shown here is the 12zrun and is for 10am at 925mb tomorrow morning shortly after cold frontal passage. It`s not until after the cold front sweeps through that our air mass turns much colder and 925mb temps drop to around -5c with 850mb temps lowering to -8c.

Ok, so as mentioned this morning and looking at the 18zGFS operational run, it still appears that a cold front with very cold upper level trough is still forecasted to sweep through here during the early morning hours. WRF shows this as well along with the 00zWRF of tonight. And between the 00zNAM/ and UW-NAM/GFS...a PSCZ is looking possible over the central sound around tomorrow afternoon. However, depending on what model you choose, there is some moderate westerly winds aloft after frontal passage in which we could be briefly rain or snow shadowed, but looks like we eventually fill in during the afternoon hours of tomorrow. So should be a pretty good chance of snow showers.

Though not much in the way of snow is shown for Sat/Sun on the 24hr snow map on the 12z run, models do show plenty of shower acitivity. So though the Seattle NWS has a WINTER WEATHER ADVIOSRY out and calling for 2-5" of snow, my thinking is that it could be a bit less and perhaps something in the range of say 1-3" with local accumulations of 6". The higher amounts of course will probably be in the usual areas like The CZ area and in the North interior. Thats my guess for now. Bring on the snow! :o)