To throw some fuel onto the "which swift was it?" fire, here is the last four days of 850mb winds, plus tomorrow's winds as well (April 23). These winds are near the surface here in Colorado, but about 1 - 1.5km above the ground in other closer to sea level locations. This is every three hours of data and the local mountain time is listed in the bottom right corner of the movie while I click through each time step. The green circle located in the middle of the image is Longmont, CO, just for reference. Note the direction that the winds are predominantly from on each day and what that might mean for the Chaetura swift species that might show up, with Vaux's being predominantly West Coastal, and Chimney being predominantly Gulf Coastal. Just fuel for the fire.
If you wanted to explore this on your own, you can go to earth.nullschool.net to check it out as well. Hit the "Earth" button in the bottom left to start navigating the times and the levels. I chose 850mb for my movie, but you might want to choose others.
Best of luck hunting for these birds if you go out. I stopped Monday morning at McIntosh Lake here in Longmont this morning and found over 450 swallows flying low over the lake, but no swifts. Will keep looking though.
Bryan Guarente
Meteorologist/Instructional Designer
UCAR/The COMET Program
Boulder, CO
On Mon, Apr 22, 2019 at 10:13 PM David Tønnessen <davidtonnessenx@gmail.com> wrote:
In addition to Ted and Andy's reports of possible Vaux's Swifts, I have received two other alerts from eBird of Chaetura swifts in the last two days. The low clouds that smothered much of the front range today are supposed to linger into the early-mid morning tomorrow in at least Denver and south, maybe forcing flight-feeding birds like swallows and swifts to feed close to the ground. Might be worth keeping an eye out around buggy bodies of water for those who are able to!--David TonnessenColorado Springs, CO
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