"Special Weather Statement: Tornado Warning". National Weather Service Norman, Oklahoma. May 31, 2013. Retrieved June 1, 2013 – via Iowa Environmental Mesonet NWS Product Archive.
Greg Dial (May 31, 2013). "Mesoscale Discussion 908". Storm Prediction Center. National Oceanic and Atmospheric Administration. Archived from the original on June 3, 2013. Retrieved June 1, 2013.
Roger Edwards (2013). "Tornado Safety". Storm Prediction Center. National Oceanic and Atmospheric Administration. Retrieved June 1, 2013.
nws.noaa.gov
"Update On May 31 El Reno Tornado". National Weather Service Norman, Oklahoma. National Oceanic and Atmospheric Administration. June 4, 2013. Archived from the original on August 5, 2012. Retrieved June 4, 2013.
Greg Dial (May 31, 2013). "Mesoscale Discussion 908". Storm Prediction Center. National Oceanic and Atmospheric Administration. Archived from the original on June 3, 2013. Retrieved June 1, 2013.
"Update On May 31 El Reno Tornado". National Weather Service Norman, Oklahoma. National Oceanic and Atmospheric Administration. June 4, 2013. Archived from the original on August 5, 2012. Retrieved June 4, 2013.