Tues 13 Sept 2011

First image is of the winds aloft at 850 mb (approx 5000 ft). Winds over the state, and the whole Pacific Flyway, were light and variable at 5 to 10 knots.

Second image is of the surface winds and pressure.  I put this in today’s post to show the high pressure system building off the coast.  As this moves in the leading edge will have migration favorable northerly wind which will be taken advantage of by the remaining south bound migrants as long as it doesn’t drop south

The RTX radar was down last night.

(Click on the thumbnails to view the full-sized images.)

Sunset last night was at 7:28 pm pdst.

The light and variable winds over the area is less than optimal for nocturnal migration so i wouldn’t expect that many new birds came into the state last night.  While the light winds wouldn’t be much of a barrier to southbound birds, densities are always higher when they have a tailwind.