This Day in National/World Weather History ...
 20 September 1845 → The "Great Adirondack Tornado," really a family of up to 4 tornadoes, traversed an incredible 275 miles, tearing down many thousands of trees across northern New York and northern Vermont. The damage path from the tornadoes and associated downburst winds was up to a mile and a half wide. Hailstones were as big as hens' eggs.
 20 September 1987 → A vivid rainbow was seen at Fort Simpson, in the Northwest Territories of Canada, during a visit by Pope John Paul II.

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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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