First image is of the winds aloft at 850 mb (approx 5000 ft). Winds are light and variable with an westerly bias. There is no real organized system currently. Migration ready birds have nothing really holding them back.
Second image is of the surface winds and pressure. Light and variable.
Third image is a snapshot of the base velocity showing north to SSE directionality at a peak of 20 to 25 knots.
Fourth image is the animated gif with snapshots every half hour of the base reflectivity above radar station RTX. The density reached up to 20dBZ last night. That’s only the third time i can remember it doing so this season. So plenty of birds were in the air last night and it should prove to be a great day in the field. 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 6:53 pm pdst.