Weds 14 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.  There was some westerly on shore winds and the low pressure off shore has some 15 to 20 knot northerly winds associated with it.

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.  It is slipping southward so all we may end up with is westerlies.

The RTX radar was down last again night.

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

Sunset last night was at 7:26 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.  However, as i was traveling the streets of Portland yesterday i came across a couple of large flocks of newly arrived Canada Geese on the ball fields of Franklin High School, and there are reports that the Vaux’s Swifts at Chapman are increasing in numbers.  So they’re slipping in.

Below is a snapshot of the regional picture.  Perhaps i’m a bit spoiled by looking at the East Coast, but we just don’t see the densities like they experience back there — at least not yet.