This Day in National/World Weather History ...
 21 April 1887 → Prescott, KS was directly hit by an F4 tornado, resulting in 12 fatalities and 80 homes destroyed. The tornado was part of a family of tornadoes that reduced farms to kindling along a 60 mile path from Anderson County, KS to Bates County, MO. It was one of the most expensive tornado disasters of the 19th Century.
 21 April 1967Tornadoes ravaged northern Illinois. An F4 occurring at 3:50 pm in Belvidere left 24 dead and 500 injured. Seven people were killed at a shopping center, and at least 13 were killed at Belvidere High School. Another F4 at 5:24 pm left 33 dead and 500 injured. This funnel hit Palos Hills, Oak Lawn, Hometown, and Evergreen Park southwest of Chicago.
 21 April 2002 → An F3 tornado struck Wayne County, IL with winds as high as 200mph. Incredibly, only one life was lost.

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May 16, 1929:

On this day, Aberdeen recorded 3.0 inches of snow. This is the latest measurable snow for the city of Aberdeen on record.

May 16, 1992:

This was a wild day across the tri state region of Nebraska, South Dakota, and Iowa, with tornadoes and very strong straight-line winds. A tornado tore up three grain bins and two farm wagons in Cedar County of northeast Nebraska before crossing into Dixon County. As it traveled east, it destroyed two barns and a garage, and was responsible for killing between 5,000 and 10,000 chickens at a chicken farm. In northwest Iowa, Sioux City reported winds of around 60 miles an hour causing some minor damage. Elsewhere, winds gusted as high as 75 miles an hour in Spencer and 74 miles an hour in Le Mars.

Record Highs: Record Lows:
Aberdeen: 101 (1934) Aberdeen: 29 (1929)
Kennebec: 102 (1934) Kennebec: 26 (2011)
Mobridge: 97 (1934) Mobridge: 27 (2009)
Pierre: 98 (1934) Pierre: 29 (2009)
Sisseton: 96 (1934) Sisseton: 29 (1983)
Timber Lake: 89 (1987) Timber Lake: 25 (2009)
Watertown: 99 (1934) Watertown: 23 (1929)
Wheaton: 90 (1918) Wheaton: 24 (1923)

Record Precipitation: Record Snowfall:
Aberdeen: 1.15" (2004) Aberdeen: 3.0" (1929)
Kennebec: 1.53" (1962)
Mobridge: 1.15" (1942)
Pierre: 2.03" (1962)
Sisseton: 2.43" (1962)
Timber Lake: 1.11" (1961)
Watertown: 1.52" (1962)
Wheaton: 1.63" (1962) is the U.S. government's official web portal to all federal, state and local government web resources and services.