PNW Migration Update – 15 May 2013

WSW winds and scattered squalls kept coastal migration to a minimum last night.  Inland birds were once again pushed up against the Cascades.  Overall the migration was moderate with a few heavy patches here and there.  Showers to the south of Portland will probably limit the turnover in the area.

The low is having a hard time pushing ashore but the high is stripping moisture and cooler air from it and driving it inland.  The surface winds are variable but aloft the flow is solidly WSW.

Nationally there was widespread migration along all three Flyways.  Texas had a heavy influx of new birds and the north Plains were under siege.  Check out the regional migration trackers for details.  Always worth a look; Paul Hurtado’s archived national radar loop.

Left Click for Larger Gallery View: