Friday 18 May 2012 – PNW Migration Update

The high pressure ridge off the coast moved a bit east last night.  That picked up the winds out of the northwest to a sustained 15 knots, and we had gusts up to 20 knots just as birds were getting ready to move.  These winds may have been enough of a deterrent to slow down migration.

Locally migration was light to moderate last night, with a small pocket of heavy migration to our north.  Movement along the coast was minimal or below the radar, probably due to the 20+ knot winds out of the north.

In the field the listserve migration chatter is dying down as we pass peak migration.  Another Bullock’s Oriole sighting was yesterday’s highlight.  Check out eBird for Multnomah and Washington Counties.  I had a lone Greater White Fronted Goose mixed in with a large collection of resident Canada Geese and a lone female Green Wing Teal at what remains of the Blount Rd swale just outside of Canby.

The outlook for migration over the next few days remains good weather wise.  The wind is forecasted to remain light, under 10 knots, but still out of the NNW.  The temperatures should get back into the 70’s by the weekend.  It looks like we will have partly cloudy conditions building to possible rain by early next week.  All in all, a very pleasant weekend on tap.

Regionally migration in the Rogue Valley basically came to a standstill.  There was some light movement but it was not wide spread.

The southern portion of the Pacific Flyway has pockets of heavy migration but, it too, is slowing down.  Late migrants are probably the bulk of these returns

Nationally the weather continues to favor the Central Flyway. We find the birds are still pouring in from Mexico.  The radars are again lit up with heavy returns from Brownsville to Minot.  The Mississippi flyway had a significant increase in density last night, all the way up into the Ohio valley.  As the high pressure builds over the eastern Great Lakes northerly flow is curtailing movement along the Atlantic Flyway and is basically absent in the Southeast.

As always — For more detailed migration updates in other regions check:

Wisconsin and New Jersey – woodcreeper  by David LaPuma
Michigan’s Upper Peninsula – The Northwoods BIRDAR by Max Henschell <- NEW!
New England – Tom Auer’s blog
Florida/SE – Badbirdz Reloaded by Angel and Mariel Abreu
PA/Ohio Valley – Nemesis Bird by Drew Weber
NW Ohio – Birding the Crane Creek by Kenn Kaufman
Arizona – Words About Birds by Tim Schreckengost <- NEW!
New Mexico – Albuquerque Birding by Matt O’Donnell <- NEW!
Pac NW – Birds Over Portland by Greg Haworth
Continental US – eBird BirdCast Forecast & Report by Team eBird

Also under NEXRAD Trackers in the sidebar to the right.