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Storm Prediction Center: http://www.spc.noaa.gov/products/index.html
Tornado Project - Tons of historical tornado info: http://www.tornadoproject.com/
Info on severe weather safety and preparedness: https://www.weather.gov/safety/
“Severe Weather 101 — Tornadoes”: https://www.nssl.noaa.gov/education/svrwx101/tornadoes/
NOAA Environmental Visualization lab severe weather event satellite images): http://www.nnvl.noaa.gov/MediaHome.php?MediaTypeID=1&CategoryID=36