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 30 October 1948 → The Donora, PA smog disaster finally came to an end. For five days pollution from industry in the area was trapped in the lower atmosphere over the Monongahela Valley, killing 20 people and making 2000 people sick.
 30 October 2004 → University of Hawaii students visiting the library had to escape through a window due to surging flood waters.
 30 October 2011 → An unusually severe early season winter storm swept up the Appalachians into New England. Over a foot of snow fell from West Virginia to Maine, with more than two feet in the mountains of Massachusetts and New Hampshire. Winds over 50 mph were reported on Nantucket Island and Martha's Vineyard.

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February 9, 1994:

Widespread record cold occurred across central, north central, and northeast South Dakota as well as west central Minnesota. Record lows were set at Aberdeen, Mobridge, Pierre, Sisseton, Timber Lake, and Wheaton. Overnight lows were in the 30s to 40s below zero across the entire area. Aberdeen fell to 45 degrees below zero which was just one degree off of it's all time record low of 46 degrees below zero. Mobridge fell to 38 degrees below zero and Pierre fell to 35 degrees below zero. Watertown came just one degree short of their daytime record with 35 degrees below zero.


Record Highs: Record Lows:
Aberdeen: 53 (1987) Aberdeen: -45 (1994)
Kennebec: 70 (1954) Kennebec: -41 (1899)
Mobridge: 58 (1931) Mobridge: -38 (1994)
Pierre: 66 (1999) Pierre: -35 (1994)
Sisseton: 51 (1987) Sisseton: -33 (1994)
Timber Lake: 58 (1984) Timber Lake: -32 (1994)
Watertown: 49 (1987) Watertown: -36 (1899)
Wheaton: 50 (1987) Wheaton: -31 (1994)

Record Precipitation: Record Snowfall:
Aberdeen: 0.60" (1909) Aberdeen: 8.0" (1893)
Kennebec: 0.51" (1960) Kennebec: 6.1" (1960)
Mobridge: 1.06" (2009) Mobridge: 3.9" (1966)
Pierre: 0.76" (2009) Pierre: 4.5" (1960)
Sisseton: 0.54" (1966) Sisseton: 4.5" (1966)
Timber Lake: 0.57" (1944) Timber Lake: 7.0" (1944)
Watertown: 0.50" (1909) Watertown: 5.0" (1909)
Wheaton: 0.41" (1966) Wheaton: 3.0" (1985)


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