Classic early September weather coming up just as we enter…September. Funny how that works.
Trough has moved on east this evening and showers are finished. Clearing skies tonight + cold & dry airmass means widespread 40’s. I wouldn’t be surprised to see Battle Ground or Forest Grove down slightly below 40 degrees tonight.
Offshore flow begins tomorrow under a building upper level ridge with light easterly wind through the Gorge, but northerly wind will continue in the Valley. This should keep temperatures from getting above 80.
Friday a different story with our first strong easterly flow of the early Fall season. MM5-UW shows 4-6 millibars easterly pressure gradient through the Gorge. In the warm season this should send gusty east wind out across the metro area during the day Friday. Peak gusts probably 25-30 mph. 40-45 mph more likely at the west end of the Gorge. I used to hate that when I lived in a windy spot near Corbett because it would knock down my corn before it was ready in September….But I digress. Thermal trough with much lighter easterly wind will sit over us all day Saturday, so that should be the warmest day.
A change in the maps means not so hot the rest of the weekend, but more warm/hot weather later next week. The ridge is going to get knocked down and pushed east a bit Sunday-Tuesday, then it rebounds right over us Wednesday-late next week. It all adds up to a bunch more summer…Mark