First image is of the winds aloft at 850 mb (approx 5000 ft). Calm winds will have little impact on any migrant movement in our area. However, some 20 to 25 knot WNW winds in western Canada could provide the impetus for some migrants to leave the breeding grounds.
Second image is a snapshot of the base velocity showing north to south directionality at a peak of 15 to 20 knots.
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 8:25 pm pdst.
Overall density continues to be light.