The United States suffered one of the worst tornado outbreaks in recorded history during the month of April 2011, with hundreds of deaths and nightmarish destruction.
The NOAA Storm Prediction Center received 875 tornado reports during that month alone; 625 have been confirmed as tornadoes, so far. Most of these occurred around April 15 to 16 and April 26 to 27.
Below is an animation created by NOAA's Environmental Visualization Laboratory showing the tornado activities captured by satellites through the month of April. Though the tornadoes cannot actually be seen by the images, they are symbolized as red dots. That said, each red dot in the animation represents a tornado that formed during the time.
The actual tornado locations are acquired from the NOAA Storm Prediction Center, which uses both radar and ground reports to generate a detailed database of tornadoes.
Accuweather
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