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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February 21, 1969:

Heavy snow along with winds of 15 to 25 mph caused blowing and drifting snow which closed many roads. Snowfall amounts of 5 to 12 inches were common across eastern South Dakota from the 20th into the 22nd. Some snowfall amounts included, 5 inches at Clear Lake and Brookings, 6 inches at Wilmot, 7 inches at Milbank, Redfield and Mitchell, 8 inches at Conde, 9 inches at Webster, Sioux Falls, and Huron.

February 21, 1975:

Across northwest and north central South Dakota, snow driven by very strong winds created blizzard conditions. Schools were closed and traffic was halted on many roads. Snowfall amounts included, 3 inches at Timber Lake, 4 inches southeast of McLaughlin, and 8 inches at Eagle Butte.


Record Highs: Record Lows:
Aberdeen: 61 (1977) Aberdeen: -30 (1918)
Kennebec: 75 (2000) Kennebec: -25 (1936)
Mobridge: 66 (1982) Mobridge: -25 (1936)
Pierre: 73 (1982) Pierre: -17 (1936)
Sisseton: 58 (1961) Sisseton: -19 (2001)
Timber Lake: 68 (1982) Timber Lake: -21 (1941)
Watertown: 58 (2000) Watertown: -31 (1918)
Wheaton: 54 (1961) Wheaton: -29 (1918)

Record Precipitation: Record Snowfall:
Aberdeen: 0.25" (1917) Aberdeen: 2.5" (1917)
Kennebec: 0.26" (1935) Kennebec: 2.5" (1957)
Mobridge: 0.50" (1927) Mobridge: 2.2" (1972)
Pierre: 0.33" (1957) Pierre: 3.3" (1957)
Sisseton: 0.45" (1969) Sisseton: 5.0" (1962)
Timber Lake: 0.22" (1975) Timber Lake: 3.0" (1975)
Watertown: 0.50" (1957) Watertown: 3.0" (1957)
Wheaton: 0.96" (2011) Wheaton: 11.6" (2011)


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