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 11, 1975:

A line of thunderstorms moved rapidly across portions of central and eastern South Dakota during the early morning hours. Winds gusted to 70 mph, causing considerable damage to trees. At Canton, in Lincoln County, the winds were estimated as high as 70 mph. In Sioux Falls, the peak wind gust measured 69 mph. Wind damage was also reported in Miller and Ree Heights in Hand County, as well as in Selby and Mobridge in Walworth County.

August 11, 1985:

Lightning set off eleven fires in the Cheyenne River Indian Reservation area. Twenty acres of grassland were burned two miles northeast of Bear Creak. About 600 acres of grassland were burned 8 miles southwest of Lantry. About 3,000 acres of grassland burned near Eagle Butte.

August 11, 2011:

Severe thunderstorms brought hail up to the size of ping pong balls and damaging winds up to 90 mph to parts of central South Dakota. Jones and Lyman Counties received the brunt of the strong winds with eighty mph winds downing several grain bins along with knocking a few semis off of Interstate-90 near Murdo. The winds also downed some power lines and poles along with destroying a hanger. The two planes in the hanger were damaged at the Murdo Airport. Near Kennebec in Lyman County, eighty mph winds took shingles off the house and also damaged the deck. A barn was also destroyed with a horse being injured. Many tree branches were also downed.


Record Highs: Record Lows:
Aberdeen: 103 (1988) Aberdeen: 34 (1902)
Kennebec: 110 (1959) Kennebec: 36 (1902)
Mobridge: 106 (1959) Mobridge: 44 (1952)
Pierre: 109 (1988) Pierre: 47 (1946)
Sisseton: 102 (1936) Sisseton: 40 (1902)
Timber Lake: 103 (1988) Timber Lake: 41 (1952)
Watertown: 100 (1933) Watertown: 33 (1902)
Wheaton: 97 (1988) Wheaton: 42 (1968)

Record Precipitation:
Aberdeen: 1.51" (1950)
Kennebec: 1.90" (2011)
Mobridge: 1.16" (1912)
Pierre: 1.22" (2002)
Sisseton: 1.21" (2008)
Timber Lake: 1.44" (1947)
Watertown: 1.66" (1974)
Wheaton: 1.50" (2007)


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