April 21
35 entries from the federal record fall on April 21, across every year it covers.
Tornadoes
Tornadoes rated F3/EF3 or stronger, or that killed, on this date.
- 1967F4, 15 mile path, 33 killed Cook, IL
- 1967F4, 25.5 mile path, 24 killed Boone, IL; McHenry, IL
- 1967F4, 8.8 mile path, 1 killed McHenry, IL; Lake, IL
- 2001F4, 5 mile path, 1 killed Barton, KS
- 1952F4, 2.3 mile path McLennan, TX
- 1957F4, 29.2 mile path Hockley, TX; Lamb, TX
- 1957F4, 15.5 mile path Lubbock, TX
- 1967F4, 59 mile path Linn, MO; Macon, MO; Knox, MO
- 1967F4, 12 mile path Clinton, MI
- 1973F4, 14.6 mile path Mercer, MO; Putnam, MO
- 1974F4, 26 mile path Fond du Lac, WI; Winnebago, WI
- 1984F3, 71 mile path, 15 killed Union, MS; Leflore, MS; Tallahatchie, MS
- 1972F3, 0.3 mile path, 3 killed Pope, IL
- 1985F3, 4.5 mile path, 3 killed Throckmorton, TX; Young, TX
- 1951F3, 33.5 mile path, 2 killed Jones, MS; Jasper, MS
- 1974F3, 58.6 mile path, 2 killed Dodge, WI; Fond du Lac, WI; Sheboygan, WI
- 1996F3, 10.1 mile path, 2 killed Sebastian, AR; Crawford, AR; Sequoyah, OK
- 1996F3, 15 mile path, 2 killed Madison, AR
- 1977F3, 3.8 mile path, 1 killed St. Martin, LA
- 2002F3, 31.5 mile path, 1 killed Jefferson, IL; Wayne, IL
- 1964F3, 14.1 mile path McDonough, IL
- 1967F3, 14.6 mile path Ray, MO; Carroll, MO
- 1967F3, 0.1 mile path Jefferson, IA
- 1967F3, 13.6 mile path Kent, MI
- 1972F3, 12.8 mile path Leflore, MS
- 1972F3, 5.7 mile path Butler, KY
- 1972F3, 32.3 mile path Lawrence, TN; Giles, TN
- 1972F3, 1 mile path Grayson, KY
- 1972F3, 9.1 mile path Lincoln, MS
- 1974F3, 22.2 mile path Dodge, WI; Fond du Lac, WI
- 1984F3, 3 mile path Shelby, TN
- 2005F3, 5 mile path Neosho, KS
- 1955F2, 0.5 mile path, 1 killed Jefferson, AR
Earthquakes
Magnitude 5 or more in the lower 48 and Hawaii, 6.5 or more in Alaska, on this date (local time).
- 1918M6.7, San Jacinto, California Riverside County, CA
- 2001M5.3, near Freedom, Idaho Caribou County, ID