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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May 12, 1984:

An F3 tornado wiped out seven farms, crippled fifteen others, killed livestock and scattered several cars and machinery in its path. The tornado first touched down seven miles north and one mile east of Clark and moved southeast through the southwestern sections of Henry until it dissipated at Grover in Codington County. Hail, three quarters inch on up to four inches was common in and near the tornado path. The path of destruction began on a farm where two barns, a steel grain bin and a pole barn were demolished and machinery was damaged. As the tornado moved further southeast, it struck the southwest sections of Henry and split into two tornados that moved in two different directions. One went to the northeast that inflicted no damaged and dissipated, while the other went southeast that continued its destruction path to Grover. Small hail, accumulation to fifteen inches deep, was experienced at Henry and tornado damage included broken windows, numerous homes and three trailer homes were demolished. Along the path, 80 power poles and several miles of power lines were lost, affecting the power to over 1,000 people. A small plane, southwest of Garden City was wrapped around a pole.


Record Highs: Record Lows:
Aberdeen: 90 (1900) Aberdeen: 17 (1946)
Kennebec: 95 (1894) Kennebec: 21 (1946)
Mobridge: 90 (1958) Mobridge: 18 (1943)
Pierre: 88 (1977) Pierre: 22 (1943)
Sisseton: 89 (1991) Sisseton: 19 (1946)
Timber Lake: 93 (1915) Timber Lake: 15 (1943)
Watertown: 87 (1900) Watertown: 19 (1946)
Wheaton: 90 (1991) Wheaton: 22 (1923)

Record Precipitation: Record Snowfall:
Aberdeen: 0.86" (2011) Aberdeen: 2.0" (1943)
Kennebec: 1.60" (2005)
Mobridge: 1.28" (2005)
Pierre: 1.10" (1920)
Sisseton: 2.20" (1998) Sisseton: 1.5" (1953)
Timber Lake: 1.60" (2005)
Watertown: 2.57" (1963) Watertown: 0.1" (1953)
Wheaton: 1.65" (1998)


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