ST. PETERSBURG, Fla. -- When a unique feature pops up on Doppler radar and there's no significant precipitation around, what could possibly be going on? 10News meteorologist Grant Gilmore noticed ...

It is known as a "roost ring," and it was detected along the Kankakee River in Northwest Indiana on Tuesday around 5 a.m. ... which are often detected by NWS Doppler radar.

But the energy from the radar signal dissipates very rapidly with distance: at just one kilometer from the radar, the power is 0.0000019 MW, and at the radar’s maximum range of 460 kilometers ...

But the energy from the radar signal dissipates very rapidly with distance: at just one kilometer from the radar, the power is 0.0000019 MW, and at the radar’s maximum range of 460 kilometers ...