24 Mar 2014 PNW Migration Update

The high pressure ridge has slowly moved inland and is being replaced with a bit of a low trough.  As that moves east we will get winds out of the south.  So, depending on the amount of rain, conditions are going to be in the service of north bound migrants.

Over the weekend as the high moved in, winds were out of the north but very light.  Last night, as the high was pretty much centered over the region, there were practically no winds and migrants had free reign of the skies.  Which they took full advantage of and gave us our first “green doughnut” of the season.  Returns were up to 20+ dBZ across the region. I’ve included a number of loops from last night taking a survey of the region as well as one from over the weekend out of RTX.  Taken together these give a really good picture of the state of this season’s migration.  We’re right on the edge of the building surge.

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

23 Mar Base Reflectivity - Portland (KRTX)

24 Mar Base Reflectivity - Portland (KRTX)

24 Mar Base Velocity - Portland (KRTX)

24 Mar HC - Portland (KRTX)

24 Mar Base Reflectivity - Medford (KMAX)

24 Mar Base Reflectivity – Gray’s Harbor (KLGX)

24 Mar Base Reflectivity - Seattle (KATX)

Here is Paul’s archived National Radar Composite from yesterday.  Not much happening as north winds have sealed off the east.  And once again the PNW and California Central Valley are the migration hot spots.

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