First image is of the winds aloft at 850 mb (approx 5000 ft). Winds over the state were light and variable at 5 to 10 knots. Way up north winds have turned a bit more favorable for Pacific Flyway migrants.
Second image is a snapshot of the base velocity showing north to south directionality at a peak of 20 to 25knots.
Third image is an animated gif with snapshots every half hour of the base reflectivity above radar station RTX. Animation runs from around 8:00 pm pdst yesterday evening through 5:00 am pdst this morning. (Click on the thumbnails to view the full-sized images and animation.)
Sunset last night was at 7:32 pm pdst.
Density was decent but reflectivity readings did not get up into the 20 dBz range last night. New birds should be in the area today, but spread out. The heaviest concentrations continue to be east of Portland along the Cascades.