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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August 13, 1987:

A succession of thunderstorms produced rainfall that was unprecedented in 116 years of precipitation records at Chicago, Illinois during an 18 hour period from the evening of the 13th to the early afternoon of the 14th. The resulting flash flood was the worst to ever strike the Chicago metropolitan area, causing 3 deaths and water damage that amounted to 221 million dollars worth. O Hare International Airport received an event total of 9.35 inches of rain in 18 hours, shattering the previous 24 hour record of 6.24 inches. For a period of about 24 hours, the airport was only accessible from the air as all roads were blocked by high water, including the Kennedy Expressway.

Record Highs: Record Lows:
Aberdeen: 112 (1965) Aberdeen: 35 (1964)
Kennebec: 114 (1965) Kennebec: 45 (2012)
Mobridge: 107 (1938) Mobridge: 44 (2004)
Pierre: 108 (1965) Pierre: 48 (2012)
Sisseton: 104 (1965) Sisseton: 39 (1964)
Timber Lake: 102 (1939) Timber Lake: 42 (2004)
Watertown: 102 (1965) Watertown: 35 (1964)
Wheaton: 100 (1984) Wheaton: 38 (1924)

Record Precipitation:
Aberdeen: 1.02" (1895)
Kennebec: 1.30" (1980)
Mobridge: 0.75" (1927)
Pierre: 1.35" (1997)
Sisseton: 1.75" (1989)
Timber Lake: 0.38" (1934)
Watertown: 1.28" (1945)
Wheaton: 1.52" (2006) is the U.S. government's official web portal to all federal, state and local government web resources and services.