Chief Meteorologist Justin Stapleton‘s Daily Forecast Discussion:
Dense fog will again take over tonight, dropping visibility to less than a mile overnight with lows approaching 30 degrees. Areas of freezing fog will be back for folks headed back to work and if you’re heading out of town for the New Year holiday, Because we might dip below freezing, some patchy freezing frost may coat area roads for overnight tonight and early Friday morning.
The inversion will keep valley residents socked into the fog for a fourth consecutive day and likely socked into highs only reaching the upper 30s as well. As you might expect, air quality will be an issue throughout the week, an Air Stagnation Advisory has been issued for the Willamette Valley. Elsewhere the coast and mountains continue to see mostly sunny skies with highs into the 50s.
By Friday night, a weak cold front will brush through Western Oregon and Washington, it won’t bring a huge chance for rain, mainly some isolated showers along the north coast and some flurries in the mountains. Freezing levels will dip down to around 6500 feet, but there most be much if any accumulating snow. The benefit is the front 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.
Air Stagnation Advisories continue through Sunday evening for the Willamette valley as the dense fog (if it happens to break some) will likely be back early next week as the high pressure ridge rebuilds. This year is likely going down as one of the drier that Oregon has seen in quite some time.
Have a great holiday week!
– Chief Meteorologist Justin Stapleton
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