1. What you are seeing
Radar composites combine ground-based weather radar data prepared by third parties. Colors indicate reflected energy from precipitation; timing and frame rate depend on RainViewer and source radars. Gaps, delays, or calibration differences between regions are normal.
Bright returns usually mean heavy rain or hail aloft, but non-weather targets (insects, sea clutter, wind farms) can also appear in raw data before quality control. Consumer mosaics simplify that complexity, which is another reason to lean on official forecasts for high-stakes decisions.
2. Beam height, range, and gaps
Radar beams climb with distance because of Earth curvature, so low-level rain far from the site can be under-sampled compared with what you feel at the surface. Mountains and buildings block beams, creating shadows on the map that are artifacts of geometry, not clear skies.
When a loop pauses or jumps, the cause may be maintenance, networking, or missing ingest for one site—absence of color is not proof that nothing is happening if other observations disagree.
3. Official information first
For severe weather, floods, or evacuation, use products from your national or local meteorological service and emergency alerts—not a general web map. WorldMaps3D does not issue watches or warnings.
Warnings include spatial polygons, timing, and recommended actions that a raster loop cannot replace. Treat this radar view as a supplement you use after you know whether an advisory is already in effect.
4. General science (educational)
Weather radar sends microwave pulses and listens for echoes from rain, snow, or hail. Doppler radar can measure motion toward or away from the radar along each beam. Professional forecasters use many products beyond a single color loop; this site shows a simplified consumer view.
Dual-polarization radars add extra channels to distinguish hydrometeors from clutter more reliably; public web loops rarely expose every product meteorologists rely on for warning operations.
5. Pairing tools
Use Weather Maps for broader context, then Driving Directions if you travel after checking official guidance.
Satellite basemaps help orient the storm relative to terrain, while 3D can illustrate valleys that channel wind or runoff. None of that replaces listening to local emergency managers during active events.