16 Apr 2014 PNW Migration Update

A bit of a shift in the weather.  We’re in the boundary area of the current low trough and an advancing high ridge.  Scattered rain and WNW winds.  These are not ideal conditions, but not terrible.  Migrants were on the wing, just not in great numbers.  Probably the strong fliers like geese and ducks pushed through.  However the dickie birds will probably put down to keep their feathers dry and ease up on the metabolic load.  It looks like they met the rain in the Metro area.  Could be a good day to go and check out your favorite patch this morning.

Today’s loops are of the Reflectivity, Velocity and Hydrometeor Classification.  I find when there is a lot of noise from clouds and precipitation mixed in with the birds it is useful to use all three to verify the presence of biological targets and that they are indeed moving north, against the wind.

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

16 Apr Base Reflectivity - Portland (KRTX)

16 Apr Base Velocity - Portland (KRTX)

16 Apr HC - Portland (KRTX)

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

16 Apr  Earth

Here is Paul’s archived National Radar Composite from yesterday.  It was a low density migration last night.  Texas coast, a few spots up the Central Flyway, and the Southwest being the top hosts.  Other patches here and there.

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

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