Migration Weather Advisory: Friday Night

[Bryan Guarente]

Southeast CO

There is a small potential for movement tonight into SE CO (north to the Arkansas River, west to the Rocky Mountains) in the 9 pm to 3 am hours, but that flow pattern modifies after 3 am and birds should end up out into Kansas once again since there is no longer wind convergence into the Arkansas Valley.   This time period is a small window and it doesn't support long-distance migrants, more just short hops of migrants (from New Mexico or Texas).  You can expect minor turnover tonight in SE CO bringing in more birds.  

CO north of the Arkansas River

The winds will be out of the south, which sounds like it would be great for migration.  In this case, it is good for migration, but birds leaving the vicinity not coming into the vicinity.  The southerly flow pattern is cut off by west winds converging into the Arkansas River valley.  So if there is turnover of migrants with new birds coming into Northern CO, expect them to be locals not distant migrants.  

Hope this helps you find some birds.

Thanks for all the input recently and for the positive vibes,

Bryan

Bryan Guarente

Meteorologist/Instructional Designer

UCAR/The COMET Program

Boulder, CO