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Foggy Valleys, Sunny Skies Continue

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Chief Meteorologist Justin Stapleton‘s Daily Forecast Discussion: 

Fog continues to sock in the valleys tonight, visibility for most of the Willamette Valley is about a half mile or less with lows dropping into the low 30s tonight, there may be areas of freezing fog in the morning, especially in the outlying areas. In addition, the light winds, and thick fog will likely continue a very stagnant airmass over much of the valley, thus the air stagnation advisories have been extended through early next week.

A sizeable ridge of high pressure will move back over top of the Pacific Northwest over the next couple of days, bringing back the sunny skies and offshore winds for the coast and mountains. However, the valleys won’t be as fortunate. These conditions will lead to another temperature inversion (where the cold air gets trapped under the warmer air) for the Willamette Valley and Umpqua, so expect to see little sunshine and thick fog tomorrow through Friday. The air quality will likely suffer as well with smoke from wood stoves and other pollutants get trapped near the surface and winds aren’t strong enough to move the air around.  Highs in the valley will be lucky to hit 40 over the next couple of days. Meanwhile, the coast and mountains will see spring-like weather in the 50s and low 60s!

Saturday’s storm is looking weaker, mainly a north coast event, however, we might get enough mixing of the air to lift the fog briefly. Next week, it appears we’re back to the same old story- sunny for the coast and mountains and more fog inland.

Have a great Thursday!

– Chief Meteorologist Justin Stapleton

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