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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September 12, 1931:

On this day in 1931, near record or record heat came to an end across central and northeast South Dakota as well as west central Minnesota. From September 9th through the 12th, many record highs were set at Aberdeen, Kennebec, Mobridge, Timber Lake, Watertown, and Wheaton. High temperatures during this four-day period ranged from 95 degrees to 109 degrees. Aberdeen rose to 107 degrees on the 10th, Kennebec rose to 109 on the 9th, Mobridge rose to 105 on the 9th, Timber Lake’s high was 106 on the 9th, Watertown rose to 104 on the 10th, and Wheaton rose to 108 degrees on the 10th.

Record Highs: Record Lows:
Aberdeen: 97 (1931) Aberdeen: 24 (1902)
Kennebec: 102 (2004) Kennebec: 25 (1902)
Mobridge: 102 (1939) Mobridge: 32 (1989)
Pierre: 101 (1939) Pierre: 34 (1974)
Sisseton: 95 (1969) Sisseton: 30 (1902)
Timber Lake: 98 (1939) Timber Lake: 29 (1989)
Watertown: 96 (1990) Watertown: 24 (1902)
Wheaton: 95 (1931) Wheaton: 32 (1918)

Record Precipitation:
Aberdeen: 1.81" (1897)
Kennebec: 0.75" (1982)
Mobridge: 1.43" (1961)
Pierre: 0.89" (1985)
Sisseton: 1.06" (1982)
Timber Lake: 1.45" (1961)
Watertown: 1.52" (2005)
Wheaton: 1.57" (1965) is the U.S. government's official web portal to all federal, state and local government web resources and services.