1965 Elkhart, Indiana double tornado on Palm Sunday. This is one of the most incredible tornado photographs ever taken, between Goshen and Elkhart on Palm Sunday, the "double tornado" destroying the Midway Trailer Park, on U.S. Route 33, in Dunlap, Indiana April 11, 1965, at 6:32pm. These two massive funnels were rotating around each other, and produced F4 damage, killing 33 people.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
Uploaded a work by Paul Huffman for National Oceanic and Atmospheric Administration from http://www.photolib.noaa.gov/htmls/wea00217.htm (cropped) with UploadWizard