Real NEXRAD Level II Doppler radar, decoded in your browser. Featured storms load small preprocessed frames; links to any other station and time stream the raw volumes from NOAA's archive and decode them in a Web Worker. Rendering is WebGL on a MapLibre map. There's no backend.
Keys: Space play/pause · ←/→ step · R/V reflectivity/velocity · Home/End first/last scan.
Rotation markers come from an automatic velocity-couplet detector (lowest tilt, rotational velocity ≥ 20 m/s, about 39 kt). They're a demo, not a warning product.
unidata-nexrad-level2