Migratory birds are often detected by National Weather Service Doppler radar in unique doughnut patterns known as “roost rings.” Bugs and bats can also be detected. Skip Navigation ...

Using that data from Green Bay and all the other doppler radars operated by the NWS, you can actually watch the migration at websites like BirdCast. But sifting through the data is tricky.

Migratory birds are often detected by National Weather Service Doppler radar in unique doughnut patterns known as “roost rings.” Bugs and bats can also be detected. Skip Navigation ...

Migratory birds are often detected by National Weather Service Doppler radar in unique doughnut patterns known as “roost rings.” Bugs and bats can also be detected. Skip Navigation ...

Migratory birds are often detected by National Weather Service Doppler radar in unique doughnut patterns known as “roost rings.” Bugs and bats can also be detected. Skip Navigation ...

In the summer and fall before annual migrations begin, many bird species are known to gather at large communal roosting sites, according to the National Weather Service. These birds are often detected ...

Migratory birds are often detected by National Weather Service Doppler radar in unique doughnut patterns known as “roost rings.” Bugs and bats can also be detected. Skip Navigation ...

Migratory birds are often detected by National Weather Service Doppler radar in unique doughnut patterns known as “roost rings.” Bugs and bats can also be detected. Skip Navigation ...

Migratory birds are often detected by National Weather Service Doppler radar in unique doughnut patterns known as “roost rings.” Bugs and bats can also be detected. Skip Navigation ...

Migratory birds are often detected by National Weather Service Doppler radar in unique doughnut patterns known as “roost rings.” Bugs and bats can also be detected. Skip Navigation ...

Migratory birds are often detected by National Weather Service Doppler radar in unique doughnut patterns known as “roost rings.” Bugs and bats can also be detected. Skip Navigation ...