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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March 12, 1995:

Rapid snowmelt, due to warm temperatures, caused widespread flooding of streams, low areas, and farmland. Many roads were covered with water and some were washed out. Some utility poles and lines were damaged. Some schools, houses, and other buildings were damaged by high water levels. Day County was especially hit hard, with damage to roads alone estimated at $75,000. In addition, ice jams exacerbated the flooding on some culverts and streams.


Record Highs: Record Lows:
Aberdeen: 72 (1934) Aberdeen: -20 (1897)
Kennebec: 82 (2007) Kennebec: -21 (1956)
Mobridge: 80 (2007) Mobridge: -12 (1951)
Pierre: 82 (2007) Pierre: -15 (1956)
Sisseton: 70 (1934) Sisseton: -14 (2009)
Timber Lake: 78 (2006) Timber Lake: -16 (1951)
Watertown: 66 (1934) Watertown: -14 (1897)
Wheaton: 65 (1990) Wheaton: -14 (2009)

Record Precipitation: Record Snowfall:
Aberdeen: 0.94" (1977) Aberdeen: 6.0" (1927)
Kennebec: 1.80" (1977) Kennebec: 9.0" (1927)
Mobridge: 0.70" (1977) Mobridge: 2.7" (2003)
Pierre: 1.06" (1954) Pierre: 10.2" (1954)
Sisseton: 1.30" (1977) Sisseton: 6.5" (1976)
Timber Lake: 0.82" (1954) Timber Lake: 7.0" (1954)
Watertown: 1.21" (1954) Watertown: 6.0" (1954)
Wheaton: 1.68" (1977) Wheaton: 6.0" (1927)


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