We have officially dropped into the 30s at Portland International Airport for the first time this season (including many valley locations nearby). The National Weather Service has issued a Frost Advisory through 9:00 A.M. Expect a cool, sunny day across northwest Oregon and southwest Washington with metro area temperatures climbing into the mid to upper 50s. Clouds will build in late tonight and early Friday as a system drops in from the north.
Expect a chilly and wet day Friday with on and off showers and temperatures in the 40s and low 50s. Cooler air will filter in as the system passes overhead, bringing snow levels to 1,500-2,000 ft. by Saturday morning. One to three inches of snow will be possible down to pass level, and greater totals are expected above the passes. Be prepared for winter driving conditions if you plan to travel through the mountains between Friday evening and Saturday morning. Conditions will dry out during the day Saturday, but highs will struggle to climb out of the 40s both Saturday and Sunday (even with increasing sunshine). A gusty east wind will make it feel even cooler.
High pressure will keep conditions clear and dry as we kick off our next workweek. While a warming trend is anticipated (and will be most noticeable during the afternoons), we will have multiple nights with temps in the 30s and potentially the 20s. Widespread frost is anticipated.
Have a great Thursday!