Updated Wednesday 6:00 pm.
Today was one of those days when you know it’s going to be cold but it's basically an abstract thought until you step outside. That's when you realize that, Whoa!! It is really cold out here!
Well brace yourself because we're just getting started. The low temperatures tonight will be if anything, colder than last night. Many of you will be getting close to single digits especially up around Bellingham. It will not only be bitter cold, a brisk northerly wind will make it feel even colder. In Seattle the low will be around 23°. I guess the upside of all this is we get a lot of sunshine and it is really spectacular for the views.
There will be some subtle changes showing up by Thursday afternoon. Some high clouds will start to slide over us as a weak system moves along the coast and down and to Oregon. We really don't expect much out of it but we could get a few snow flurries tomorrow night and Friday morning along the coast.
Right now the weekend is looking slightly colder but there will be a lot more clouds around. We can't rule out a couple of isolated flurries during that time butt it appears that Tuesday through Wednesday a bigger transition will arrive.
In this case we’re talking about the chance of more significant snowfall. That's a typical scenario when we start the transition from very cold air to warmer air which usually brings rain. However that rain often starts as snow. This may be the time when more widespread snow shows up in western Washington.
In the Cascades the freezing level will remain at the surface and afternoon pass temperatures will range from 10 to 15°. Be on the lookout for patches of ice on the roads but otherwise travel probably won't be affected until the middle of next week.
Eastern Washington can expect more serious cold. Overnight lows will be down to the single digits in some areas and daytime highs will stay in the 20s. Again there will be a lot of sunshine but some high clouds will be sliding over late in the day.
Finally, just remember this type of weather can have an impact on your pets your plants and course your pipes, so make sure you’ve got all of that under control. By the way I put a link at the bottom of this discussion for information about wind-chill. I think it does a great job of explaining how it works and what it really means. In the meantime, I'm pretty sure I don't have to tell you to bundle up
Steve Pool KOMO Weather