We had a post roughly 3 weeks ago about the NWS radars picking up large numbers of insects flying at fairly high altitudes. Birds are also occasionally picked up on radar, especially as large numbers of them take off from a nighttime roosting area, often near a body of water. The birds take off around sunrise, and fly away from the site in many directions, forming an expanding ring of radar echo. Even though there are a whole lot fewer birds than raindrops in a typical shower, the birds are much bigger so they show up on radar.
This is happening this morning at many points in Alabama. Here is the radar loop from Birmingham, ending about 625 am.
The birds really got moving around 525 am, about 20 minutes before sunrise. The takeoff just SW of downtown Montgomery is very impressive, probably near a trubutary to the Alabama River. You can see other birds taking off from points along the Tombigbee River, from Livingston and Aliceville to near Columbus, MS, and some along I-59 near exit 97 (between Birmingham and Tuscaloosa).
Other radars also show birds taking off this morning. Still images are below from radars at Birmingham (discussed already), East Alabama (birds along Spring Creek or Buck Creek in SW Georgia), and Hytop, AL (birds near Wheeler Dam).
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- Variety on radar this morning : ABC 33/40 Weather Blog | November 4, 2010