A <a href="https://en.wikipedia.org/wiki/National_Weather_Service" class="extiw" title="en:National Weather Service">National Weather Service</a> <a href="https://en.wikipedia.org/wiki/weather_radar" class="extiw" title="en:weather radar">radar</a> mosaic loop of the contiguous United States on 3 September 2012.
National Weather Service
<a rel="nofollow" class="external free" href="https://radar.weather.gov/Conus/Loop/NatLoop.gif">http://radar.weather.gov/Conus/Loop/NatLoop.gif</a>