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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October 28, 1989:

The seasonís first snowfall brought much needed moisture to the Black Hills and portions of western South Dakota as up to nearly a foot of snow fell in the higher elevations. The storms caused motorists a number of problems. A build-up of ice and slush in combination with blowing snow prompted the State Highway Patrol to close portion of Interstate-90 from Rapid City to Wall. Numerous multiple vehicle accidents were reported

October 28, 1993:

Very strong northwest winds gusting to 50 to 60 mph raked South Dakota. In Chamberlain, the high winds knocked over two concrete block was a high school under construction. A new home under construction southwest of DeSmet collapsed in the winds. Reported peak winds included 56 mph at Huron, 55 mph at Rapid City, and 52 mph at Sioux Falls

Record Highs: Record Lows:
Aberdeen: 82 (1937) Aberdeen: -6 (1919)
Kennebec: 86 (1937) Kennebec: 2 (1919)
Mobridge: 84 (1937) Mobridge: 9 (1913)
Pierre: 87 (1937) Pierre: 15 (1952)
Sisseton: 82 (1987) Sisseton: 7 (1967)
Timber Lake: 84 (1937) Timber Lake: 10 (1952)
Watertown: 79 (1937) Watertown: 1 (1919)
Wheaton: 74 (1966) Wheaton: -3 (1919)

Record Precipitation:
Aberdeen: 1.02" (1991) Aberdeen: 1.9" (1970)
Kennebec: 1.20" (1991) Kennebec: 2.0" (1971)
Mobridge: 0.47" (1967) Mobridge: 2.0" (1991)
Pierre: 1.60" (1991) Pierre: 2.0" (1971)
Sisseton: 0.75" (1991) Sisseton: 2.0" (1971)
Timber Lake: 1.24" (1991) Timber Lake: 6.0" (1991)
Watertown: 2.05" (2004) Watertown: 2.2" (1971)
Wheaton: 0.52" (1940) is the U.S. government's official web portal to all federal, state and local government web resources and services.