Mon 30 April 2012 – PNW Migration Update

Note: looks like the UCAR radar data is still experiencing technical difficulties — so we’ll have to make do with alternate static data. To get a national loop you can check out Paul Hurtado’s site for last night’s archived data here.  This link can also be found in the side bar to the right under Weather.

Locally the rain showed up just in time to keep the birds grounded, and that is the end of that story.  It looks like Wednesday is the next window of opportunity for another pulse of migrants to show up.  Until then, it will probably be more of the same, tallies will be more indicative of effort than abundance.

In the field: trickles of birds, and only those previously reported.  To our south in the Willamette Valley a Chat and Lazuli Bunting were reported.

Regionally: the Eugene area may have had a concentration of birds pile up last night.  There was an open window to migration out of the Siskiyous for a good portion of the evening.  It’s hard to tell specifics without the KMAX radar.  But there was from 9 to 11 pm before the rain showed up for birds to head north.  If they did as they came into the Willamette drainage they would have encountered heavy cloud cover and the beginning of the rain.  This may have been enough to put the birds down as they arrived.  It would have been a small event, but i’m interested in seeing today’s field notes from the area.

The CA Central Valley had moderate to heavy migration last night.  Again i think these birds are staging and waiting for better conditions to flood over the Siskiyou pass.  I’m sure a few will trickle north or take alternate routes to the west or east.  But right now it seems they are staying put.

Nationally: a series of storms tracked from the Texas Panhandle to Central Illinois and halted any movement further north.  This band of weather could act as a concentration area as birds headed up the Central and Mississippi Flyways will have to put down.  There was a steady supply of birds too.  Migration continues to be heavy from the Gulf and up into the Ohio valley and out to the mid-Atlantic.   Behind the storm track we can see locally spotty migration taking place. New England is still pushing strong NNW winds into the face of any potential migrants and keeping that airspace bird free.

For migration updates in other regions check-
Michigan’s Upper Peninsula – The Northwoods BIRDAR by Max Henschell <- NEW this season!
New England – Tom Auer’s blog
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 this season!
Florida – Badbirdz Reloaded by Angel and Mariel Abreau
Continental US – eBird BirdCast Forecast & Report by Team eBird

Also under NEXRAD Trackers in the sidebar to the right.