This Day in National/World Weather History ...
 21 August 1883 → What was likely an F5 tornado devastated the north side of Rochester, MN. The tornado derailed a train and leveled farms. 40 people were killed.
 21 August 1888 → A "grand spectacle" of four waterspouts near Jacobson, MD overturned boats and moved ashore. 15 people were injured. Another tornado moved east-northeast near Still Pond, MD killing 10 people in a cannery. A total of 11 deaths and 40 injuries were reported from this tornado.
 21 August 1918 → Tyler, MN suffered a direct hit by an F4 tornado. Six hundred buildings were damaged or destroyed and 36 lives were taken, including three when the town's hospital was struck.
 21 August 1984 → The State Fair in Pueblo, CO had to be closed during a vicious hailstorm. Nine people were hurt, including one seriously.

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May 20, 1965:

A tornado hit north of Frederick. A barn and all outbuildings were destroyed on one farm. Windows exploded outward at the house. The tornado was estimated to be on the ground for about 5 miles.

May 20, 1974:

Softball size hail fell in Kennebec, breaking many windows in the schools and other buildings.


Record Highs: Record Lows:
Aberdeen: 96 (1934) Aberdeen: 23 (1907)
Kennebec: 100 (1925) Kennebec: 24 (1895)
Mobridge: 95 (1934) Mobridge: 26 (2003)
Pierre: 94 (1934) Pierre: 27 (2002)
Sisseton: 97 (1934) Sisseton: 30 (2002)
Timber Lake: 92 (1992) Timber Lake: 27 (2003)
Watertown: 96 (1934) Watertown: 26 (1907)
Wheaton: 92 (2009) Wheaton: 30 (1967)

Record Precipitation: Record Snowfall:
Aberdeen: 1.53" (1974)
Kennebec: 1.55" (1917)
Mobridge: 1.27" (1917)
Pierre: 1.51" (1994)
Sisseton: 1.22" (1957)
Timber Lake: 1.23" (1987)
Watertown: 1.32" (1957) Watertown: Trace (1931)
Wheaton: 0.53" (1927)


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