A deep surface low will lash northwest Washington with rain and strong winds today. Strong low pressure will make landfall over northern Vancouver Island this morning placing the Inland Northwest under warm/moist advection for the majority of the day. Rain and mountain snow will develop over central Washington this morning and spread into eastern Washington and north Idaho this afternoon and evening. Under mostly cloudy skies, we have a 70-% chance of rain during the day with highs in the lower 40’s. This evening, the surface low will move through southern British Columbia and drive a strong cold front across eastern Washington into the Idaho Panhandle. Gusty west/southwest winds will develop tonight and persist into the early morning hours Friday. Look for sustained winds of 20 to 25 mph tonight with gusts to 35 mph from Wenatchee to Moses Lake. Localized gusts of 40 mph or more could occur on the Waterville Plateau in the mid to late evening.
After the winds subside, much of central and eastern Washington should enjoy mostly sunny skies on Friday with high temperatures around 40 degrees.
By this weekend, mostly cloudy skies should prevail on Saturday along with cooler temperatures, highs in the mid-30’s. Saturday night, a large Pacific weather system moves in bringing an 80% chance of mainly snow. This system will stick around on Sunday and Monday as well with anywhere from a 50-70% chance of rain mixed with snow and high temperatures in the mid to upper 30’s. It looks like the biggest impact on travel will be Saturday night through Monday Night. Light snow accumulations in the valleys with light to moderate amounts in the mountains will be possible.
For Christmas day on Tuesday, expect mostly sunny skies, light winds and high temperatures in the upper 30’s.