- Lowland rain through the day Tuesday
- Mountain snow, heavy at times Tuesday afternoon/evening
- Some improvement ahead of Thanksgiving
It will be pretty quiet overnight with a few light passing showers but dry most of the night.
However, a weather system moving in will bring a lot of precipitation to the area Tuesday and KIRO 7 meteorologists are watching some cooler temperatures and lower snow levels Tuesday that could cause mountain pass travel issues.
They have issued a Pinpoint Alert Day for Tuesday warning pass travelers about snowy and icy travel through all the Cascades passes later in the day and points east.
The National Weather Service has issued a Winter Weather Advisory for Tuesday and Tuesday night.
In the lowlands, rain will be consistent for most of the day Tuesday with snow levels starting around 2,500′ and then rising up to around 3,500′ by the evening and even higher overnight.
We’ll see around 3-6″ of snow with rain mixing in Tuesday afternoon and evening, with potentially locally higher amounts. There could be some freezing rain over Snoqualmie Pass Tuesday evening before precipitation tapers off into early Wednesday morning.
Snow levels will continue to rise Tuesday night and Wednesday morning, though low-level wind may stay easterly and keep the lowest levels at or below freezing, at least early Wednesday That’s something we’ll watch closely. Highs tomorrow will be in the 40s.
We’ll be drier to start on Wednesday with most of the next system holding off until the late afternoon and evening hours. The next system will produce widespread rain into Thanksgiving Day, decreasing early on to scattered showers.
It will be a little breezy as well going into Thanksgiving Day itself, but no damaging winds are expected. That system will bring mainly rain to the mountain passes, too.
We’ll still see some showers and above the passes snow levels for Friday and then drier weather over the weekend for the return trip!
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