How to read CC: rain and snow alone show up near 1.0 (pink and red). Lower values (yellow, green, blue) inside a storm mean mixed objects: hail, a melting layer, or, in a small blob right where velocity shows rotation, debris lofted by a tornado. Birds, bugs and ground clutter also read low. Always check National Weather Service warnings.

Tap a square to see one radar up close, or pick it from the list. The whole-US picture combines all radars every 5 minutes and loops the last hour. A single radar shows NOAA's own scans as they arrive (every 2 to 10 minutes) and loops the last hour, at any of its four lowest tilts. Higher tilts look higher into storms farther from the radar.