Chief Meteorologist Justin Stapleton‘s Daily Forecast Discussion:
Looking a lot like London over the next couple of days as high pressure aloft will ensure folks in the valley don’t get out of the fog for the remainder of the week. Dense fog will again take over tonight, dropping visibility to less than a mile overnight with lows approaching the upper 20s. Areas of freezing fog will greet Santa and any early morning travelers as well.
For Christmas, the coast and mountaisn should see a beautiful Christmas forecast with sunny skies and highs climbing back into the 50s. However, the valleys aren’t likely to be as lucky. An inversion will set up with cold air trapping the fog in the valley, keeping the sun away and highs struggling to reach 40, likely upper 30s in many areas. Overnight lows will dip into the 20s again so areas of patchy freezing fog will also be an issue in the mornings. As you might expect, air quality will be an issue throughout the week, an Air Stagnation Advisory has been issued for the Willamette Valley.
By Friday night, a weak cold front will brush through Western Oregon and Washington, it won’t bring a good chance for any rain but may (I stress may) create some mixing of the airmass and finally break the dense fog in the valley for the weekend. Either way, we’ll keep the dry weather all the way through the end of the year! It looks like we might be welcoming in 2014 with some showers, we’ll see.
Have a great Christmas and holiday week!
– Chief Meteorologist Justin Stapleton
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