Justin’s Wednesday Night Forecast Discussion:
Chalk up another chilly, raw day here in the valley as the surface inversion once again wouldn’t break the fog in the valley with highs stuck in the mid 30s. In fact, we only gained two degrees from 33 to 35 for today. Same story elsewhere with both the coast and mountains (or anyone above 1500 feet) seeing another sunny day. Tonight, lows will again fall into the low 30s and upper 20s under spots with clear skies. Expect visibility to be an issue in the Willamette valley overnight bordering between less than a half to quarter-mile visibility.
The inversion is still very strong in the valley (remember, that’s the warmer air that sealing a lid on the colder air trapped at the surface) so air pollutants will be increased again for Wednesday. You can check out the expected Air Quality Index or AQI each day here: LRAPA
Tomorrow the surface high is moving inland so that should help to get the air stirring in the valley. I’m still thinking we’ve got one more day of mostly cloudy skies and cool temps with most of the valley sitting in the upper 30s to near 40. Meanwhile, same story elsewhere: Coast and mountains will again see ample sunshine and warmer temperatures, mainly in the 40s and 50s.
By Friday and the weekend, the high should be have moved on land, switching to a more southerly wind. Hopefully, that should be enough to scoop out the cold, dirty air and replace it with a bit of a warmer and certainly sunnier couple of afternoons. The overall patter remains remarkably dry for this time of year with the next (weak) chance for rain not entering the picture until late next week.
Have a great Thursday!
Chief Meteorologist Justin Stapleton
Also, do you have a question for the weather team? You can “Ask The Meteorologist”! I’ll be answering YOUR questions Wednesday night at 6. Click here to submit your question: Ask The Meteorologist