17 Apr 2014 PNW Migration Update

The fast moving weak ridge and advancing low has our conditions mixed for this night’s migration window.  Winds are out of the WSW as the low is centered north of us.  On the HC loop we can see some signs of birds picking their way between the rain drops.  It’s hard to tell the magnitude, but i wouldn’t think it heavy.  There will be some new arrivals in the area.  Chipping Sparrows are back.

Pacific Northwest Radar: (Click on the links below to open the .gif files in a new window)

17 Apr Base Reflectivity - Portland (KRTX)

17 Apr HC - Portland (KRTX)

Here is the grand view of the winds aloft from Earth:

17 Apr  Earth

Here is Paul’s archived National Radar Composite from yesterday.  Nice movement along the Gulf Coast and up the Mississippi Flyway last night.  Comparing the radar to the “Earth” wind map from last night is the best way to visualize migration patterns and the interaction with weather.

And here are the weather maps (click on any image to bring up a full gallery view)