20 April 2015 — PNW Migration Update

Yesterday in the narrative we had twelve migrants yet to be reported in the Northern Willamette Valley.  To day we are left with eight.  Yesterday there were reports of Yellow-breasted Chat, Yellow Warbler, Hammond’s Flycatcher, Black-headed Grosbeak.  To our south in the Shasta area a Common Nighthawk was reported.

Great conditions, clear skies and a nice tail wind – BOOM!  Heavy migration last night, all night.  The loop says it all.

Take a look at the wind map and you can predict the scenario.  Northeast – shut down.  Mississippi and Central – pile up in Texas and continuation behind the weather.  Pacific – open for business.

13 Apr 2015 — PNW Migration Update

Excellent conditions – clear skies and a bit of a tail wind – lots of birds moving up the Pacific Flyway.

Bank Swallows and Yellow-breasted Chats have made it into the San Diego Area.  Tanagers are up into the Central Valley.  And Hermit Warblers are moving through the Coast Range here in Oregon.

Mike Patterson, who writes the North Coast Diaries blog, has a great piece on phenolongical variation across Oregon’s differing ecoregions.  It’s here  — highly recommended.

It was another night where the large scale impact of weather on migration is clearly on display.  So i threw in a National Radar Composite and a map of the winds at 850 mb heights (roughly 1500 meters).

For commentary on the migration through New England check out Tom Auer’s Blog.  Also, today he has some information on a new radar product coming out of NOAA.  It’s a product they are calling “Bioscatter“.  My guess it is the same algorithm, or a clone, that derives the Hydrometeor Classification images found at the College of DuPage’s weather site, and that i highlight here at times when separating birds from rain.  I have added it to the sidebar under the Weather section.  You’ll have to figure out how to access it by navigating their product menu.

08 Apr 2015 — PNW Migration Update

There was a moderate amount of movement last night.  Birds were picking out opportunities between the rain cells.

Only listserve chatter of note comes from San Diego where Chipping Sparrows, Nashville, Yellow and Wilson’s Warblers, Yellow-breasted Chat, and Hammond’s and Western Flycatchers were reported.

Paul has his archive back on line after a few days of being down.  I’ve included a static shot of the action along the Mississippi Gulf coast line.  Looks like the neotrops are pushing their way north in good numbers.  Check out the full loop here

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