This Day in National/World Weather History ...
 21 September 1588 → After an unsuccessful battle with the English fleet, the Spanish Armada encountered strong storms and high winds off the coast of Ireland on its way back to Spain. 26 ships are believed to have been lost. The remaining ships limped back to Spain defeated and demoralized, ending the reign of the once unbeatable Spanish Armada.
 21 September 1894 → A huge tornado outbreak swept from Iowa through Minnesota to Wisconsin, with an unusual number of extremely violent tornadoes. The tornado that rampaged through Kossuth County, MN, was likely an F5 as homes and farms were wiped clean from the earth.
 21 September 1909 → A category 3 hurricane crossed the Gulf of Mexico and came ashore in southern Louisiana. The storm inflicted 120 mph winds on southeast Louisiana and took its storm surge 2 miles inland. There were about 371 fatalities despite the Weather Bureau having issued its first warnings for the storm three days earlier.
 21 September 1938 → The New England Hurricane was one of the most destructive and powerful storms ever to strike southern New England. The storm roared ashore over Long Island, NY at nearly 60 mph at the time of high tide. This created a deadly tidal surge, which submerged downtown Providence, RI under 20 feet of water. Hurricane force winds were felt throughout New England, with a gust to 186 mph at the Blue Hill Observatory in Milton, MA. The Great New England Hurricane of 1938 was responsible for over 500 deaths.

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December 17, 1989:

Subzero temperatures and bitterly cold wind chill values engulfed the region for an extended period of time, generally from December 14th through December 23rd. Wind chills were occasionally in the -50 to -70 F range, and several locations recorded subzero temperatures for four to five consecutive days. Most locations recorded several lows below -15 F during this stretch, with the coldest lows bottoming out near -30 F and high temperatures as low as -20 F.

December 17, 1993:

A prolonged period of snow occurred from December 15th through the 19th over the western half of South Dakota. Several accidents leading to injuries occurred due to ice on the 15th and many vehicles slid into ditches. Snowfall amounts were generally 4 to 10 inches. McIntosh received three inches of snow; Timber Lake, Murdo, and Selby received five inches of snow; and six inches accumulated at McLaughlin. Eagle Butte recorded seven inches of new snow.

Record Highs: Record Lows:
Aberdeen: 53 (1939) Aberdeen: -24 (1951)
Kennebec: 62 (1998) Kennebec: -34 (1922)
Mobridge: 62 (1939) Mobridge: -18 (1951)
Pierre: 62 (1939) Pierre: -22 (1951)
Sisseton: 53 (1962) Sisseton: -19 (1983)
Timber Lake: 63 (1939) Timber Lake: -22 (1929)
Watertown: 58 (1939) Watertown: -23 (1914)
Wheaton: 55 (1962) Wheaton: -20 (1983)

Record Precipitation: Record Snowfall:
Aberdeen: 0.35" (1924) Aberdeen: 3.5" (1924)
Kennebec: 0.70" (1908) Kennebec: 7.0" (1908)
Mobridge: 0.30" (1967) Mobridge: 3.9" (2000)
Pierre: 0.35" (1908) Pierre: 3.8" (1908)
Sisseton: 0.48" (1977) Sisseton: 2.0" (1984)
Timber Lake: 0.45" (1993) Timber Lake: 5.0" (1967)
Watertown: 0.55" (1977) Watertown: 3.5" (1977)
Wheaton: 0.67" (1977) Wheaton: 5.0" (1993) is the U.S. government's official web portal to all federal, state and local government web resources and services.