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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August 13, 1987:

A succession of thunderstorms produced rainfall that was unprecedented in 116 years of precipitation records at Chicago, Illinois during an 18 hour period from the evening of the 13th to the early afternoon of the 14th. The resulting flash flood was the worst to ever strike the Chicago metropolitan area, causing 3 deaths and water damage that amounted to 221 million dollars worth. O Hare International Airport received an event total of 9.35 inches of rain in 18 hours, shattering the previous 24 hour record of 6.24 inches. For a period of about 24 hours, the airport was only accessible from the air as all roads were blocked by high water, including the Kennedy Expressway.


Record Highs: Record Lows:
Aberdeen: 112 (1965) Aberdeen: 35 (1964)
Kennebec: 114 (1965) Kennebec: 45 (2012)
Mobridge: 107 (1938) Mobridge: 44 (2004)
Pierre: 108 (1965) Pierre: 48 (2012)
Sisseton: 104 (1965) Sisseton: 39 (1964)
Timber Lake: 102 (1939) Timber Lake: 42 (2004)
Watertown: 102 (1965) Watertown: 35 (1964)
Wheaton: 100 (1984) Wheaton: 38 (1924)

Record Precipitation:
Aberdeen: 1.02" (1895)
Kennebec: 1.30" (1980)
Mobridge: 0.75" (1927)
Pierre: 1.35" (1997)
Sisseton: 1.75" (1989)
Timber Lake: 0.38" (1934)
Watertown: 1.28" (1945)
Wheaton: 1.52" (2006)


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