Peter (and COBirds),
Why might it be that there were new migrants at Lagerman Reservoir this morning? And why might they be shorebirds from the Arctic Tundra? If you can't read through my thinly veiled questions, the answer is the wind pattern.
Here are the 850mb winds from earth.nullschool.net to help you answer that question. If you follow the streamlines from Longmont (green circle) backwards, you will get a sense of why there were shorebirds coming from the Arctic Tundra into our area. The winds converged over the Longmont area. To the south of Longmont, the winds were still pushing to the north, while the winds north of Longmont were streaming in from the Arctic. Makes for a simple example of migrants driven by weather patterns.
As for another thought about dispersal of migrants from the south, with the landfall of Hanna and the subsequent rainfall and impacts, you might want to look for birds here in CO ahead of that system. There is a large high pressure system to the east that is driving Hanna inland as well as drawing winds into southern CO from the south into Mexico. This is the time of year where we can start to see strange dispersals of rarities (Painted Redstart comes to mind for me, but isn't likely from the current source region of these winds). So keep your eyes peeled for hurricane-driven birds into CO, specifically the eastern slope from central to southern CO.
Thanks for the quick note.
Bryan
Bryan Guarente
Meteorologist/Instructional Designer
UCAR/The COMET Program
Boulder, CO
On Sun, Jul 26, 2020 at 9:42 AM Peter Burke <peterburke@gmail.com> wrote:
Good shorebirds at Lagerman Reservoir this morning including 18 Wilson's Phalarope, several LB Dowitcher, and at least a dozen more peeps.Peter BurkeBoulder----
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