This Day in National/World Weather History ...
 20 April 1920 → Tornadoes struck Mississippi and Alabama, killing 219 people. One F4 touched down in eastern Mississippi and then stayed on the ground for 130 miles, tearing through Marion, Franklin, and Colbert Counties in Alabama. Another F4 destroyed homes in the communities of Gurley and Brownsboro.
 20 April 1990 → Lightning struck a building housing a fish farm in Arkansas, killing 10,000 pounds of fish.

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April 21, 2007:

Heavy rains of 2 to 2.50 inches caused flash flooding in and around Watertown. Many streets were flooded in town, along with several roads outside of town. A warm front extending across the region was the focus for heavy rain, along with severe weather, during the evening across far northeast South Dakota. Hail up to the size of quarters, along with heavy rains of over 2 inches, caused some flooding mainly in Codington and Hamlin counties.


Record Highs: Record Lows:
Aberdeen: 97 (1980) Aberdeen: 16 (1936)
Kennebec: 99 (1980) Kennebec: 14 (1966)
Mobridge: 95 (1980) Mobridge: 16 (1927)
Pierre: 98 (1980) Pierre: 21 (1966)
Sisseton: 99 (1980) Sisseton: 16 (1936)
Timber Lake: 95 (1980) Timber Lake: 19 (1927)
Watertown: 95 (1980) Watertown: 10 (1927)
Wheaton: 98 (1980) Wheaton: 21 (1978)

Record Precipitation: Record Snowfall:
Aberdeen: 0.90" (1964) Aberdeen: 2.5" (1904)
Kennebec: 1.29" (1971) Kennebec: 2.0" (2002)
Mobridge: 1.11" (1968) Mobridge: 1.0" (2002)
Pierre: 1.02" (1971) Pierre: 0.5" (1982)
Sisseton: 0.74" (2007) Sisseton: 6.0" (1992)
Timber Lake: 1.18" (1964) Timber Lake: 7.0" (1988)
Watertown: 2.32" (2007) Watertown: 3.0" (2002)
Wheaton: 1.05" (1964) Wheaton: 2.0" (1992)


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