Migration Weather Forecast: September 20-21

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Bryan Guarente

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Sep 20, 2022, 10:12:47 PM9/20/22
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Overnight on September 20th, the conditions are really good for migrant movement and convergence over CO.  Here is my "now" (8pm Sept 20): 

You can see a nice swath of convergent winds from Canada into somewhere just east of Longmont (I'll be outside listening in a few minutes after this email is sent).  And that long swath convergence from up north in Canada remains strong throughout the night, but alters position to further south at 6am:

At 6am, that pattern looks better to be dropping birds along the Arkansas River and a bit south of that.  Make sure to get out and check in the morning because anywhere behind this front you could find funneled birds.  

And for those wanting to night-listen, the cloud cover will be dropping lower as the night goes on.  This will bring the birds lower to the ground as well, making them easier to hear.  If you want to track the forecast cloud cover at DIA, you can check it out here.  If you click the three horizontal bars in the top right corner, you can select different locations as needed.  

Hope you get some good birds moving through tomorrow despite the rain.
Bryan

Bryan Guarente
Meteorologist/Instructional Designer
UCAR/The COMET Program
Boulder, CO
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