A fairly decent night of migration in the face of light crosswinds out of the east and upper level southerly flow. The bloom sticks mainly to the east side of the I5 corridor.
The .gif file below shows the dBZ reaching the 25 – 30 range indicating heavy, if not widespread, migration last night.
On the Barn Swallow front; examining the past static images, and the one enclosed today, it appears there is actually three roosts taking off just after dawn. In today’s image i have highlighted the clusters just as they begin to rise and prior to dispersal.