Interesting night. It starts off with low to moderate flight but builds to a heavy flight around midnight onward. We can see this on the RTX (Portland) and LGX (Gray’s Harbor) radars. So i suspect these are not departures but arrivals.
In the news; MacGillivray’s Warbler, and Hammond’s Flycatcher have been reported in the Portland/Vancouver Basin.
And another pitch for Cornell’s Birdcast, a weekly guide to regional migration forecasts.
Here are last night’s radar loops: