You’re looking at the level of precipitation in the air, as measured by a network of weather radar sites called NEXRAD. The National Weather Service makes the raw data from 200 radars across the continental US and overseas available on noaa.gov for anyone to use, usually within minutes of being generated. Radarmatic caches and translates the radar data from its native binary format to JSON and then republishes it as a web service. The radar imagery on the home page is rendered in-browser using Javascript and the HTML5 canvas element.
RSS
Archive
Mobile