Wishing you all a safe and happy Thanksgiving! No hazards, high wind, or major snow impacts expected at this time. Tonight (Tuesday) through Sunday, snow is not expected over the passes at this time. Check road conditions at tripcheck.com
CASCADE PASSES: an insignificant amount, a dusting to 2" is possible to midnight tonight (Tuesday). NO SNOW is then expected Wednesday through Sunday. No significant wind impacts.
NORTH WA/OR: I-5 at the WA/OR border and northward through Washington, NO SNOW is expected through Sunday. No significant wind impacts.
SOUTH OR/CA: I-5 at the CA/OR border will have snow flurries or a dusting over the border pass mainly before noon today (Tuesday). This afternoon (Tuesday) through Sunday, NO SNOW is expected at pass levels. No significant wind impacts.
Major storms are not expected through Sunday. Later Thanksgiving evening or early night (Thursday), rain will develop as a storm system affects the region. Snow levels will be above 7000-8000' and therefore not affect the passes. Rain/showers will continue through Friday evening. Expect ~1/2" of total rain. Winds locally should stay under 15-20 mph. Night/morning fog is a possibility.
Small chances of showers will then exist Friday night through Sunday as a couple of storm systems pass to the north and may clip our area. Expect night/morning fog at times through Monday.
Temperatures: Frost is possible Wednesday and Thursday mornings (lows 28-32 tonight, then 30-35 Wednesday night). Patchy ice will be possible on some of the roads and bridges. Lows warm to above freezing and frost levels Thursday night through the weekend. Highs through Thursday will be in the upper 40's to low 50's, then warm to the mid 50's on Friday, and into the upper 50's-low 60's Sat-Sun. Normal high/low is near 50/36.
Looking ahead: Next storm system is expected to arrive on Tuesday Nov 30 with high snow levels. Another storm may then follow on Wednesday (Dec 1), but at this time most of the energy will probably be directed into northern Washington and British Columbia. It appears that La Nina is certainly influencing the weather patterns, as there's anomalous high pressure in the North Pacific and western U.S. This is affecting the jet stream by keeping it more north than what we typically see this time of year. However, it's still early in the rainy season, as there's still many months ahead which have the potential for plenty of precipitation.