Forecasters in the Seattle office of the National Weather Service have issued their forecast for travelers needing to drive across Washington state between tonight and Saturday while a wet winter storm rolls through.
The NWS-provided graphics below detail different conditions for each day between today, December 18th, and Saturday for the 3 primary east-west routes across the state. In short, as noted in the last graphic, drivers are advised to limit travel across Highways 2 & 12 and Interstate 90.


The Washington State Department of Transportation advises drivers to
- Check conditions/traction requirements before heading out
- Follow their winter travel tips
- Get their smartphone app for pass/traffic info
- Slow down & follow traction requirements