18 Mar 2014 PNW Migration Update

The high pressure ridge off the coast and the remnants of the cold front moving off to the east are producing the north winds that we forecast yesterday.  That kept the birds grounded in the main.  There were a few plucky voyagers plodding north, and you can make them out if you look closely at today’s loops.  But in the main it was a non-event.

The ridge should move through over the next day or so and south winds will be on the back side.  The question will be how much moisture it will be dragging behind it and will there be significant rain to dampen migrant enthusiasm.

Here are today’s loops (click on the link to bring up the .gif files)
Portland:
18 Mar Base Reflectivity - Portland (KRTX)

18 Mar Base Velocity - Portland (KRTX)

18 Mar HC - Portland (KRTX)

Here is Paul’s archived National Radar Composite from yesterday.  Only significant movement was up the Central Flyway from Texas to Kansas.

This Wind Map is always linked on the right hand sidebar under the “Weather” heading.  Take a look and you’ll see pretty clearly what the birds are facing out there.  Then match that up with Paul’s archived radar .gif and it becomes apparent why the birds stopped in Kansas last night.

Here are the weather maps:

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