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.

This Day in Weather History Archive

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                   Weather History...

July 31, 1966:

A deadly, estimated F3 tornado moved southeast, passing south of Ashley, North Dakota, destroying buildings on five farms with near F4 damage to one farm house. Another tornado with F2 strength occurred north of Long Lake where two adults were killed and three children were injured as a car was thrown 500 feet from Highway 101. A second estimated F2 tornado moved ENE just south of Aberdeen. A trailer was demolished, killing a man and injuring his wife. Seven airplanes were also had damage. Property damage was estimated at a quarter million dollars. An estimated 90 mph winds gust was also reported northeast of Aberdeen.

July 31, 1987:

The second deadliest tornado in Canadian history occurred in Edmonton, Alberta. An F4 tornado killed 27 people, injured over 300, and caused a quarter of a billion dollars in damage.

July 31, 2008:

In the early morning hours of the 31st, a line of storms originating in North Dakota began to expand and surge southeast into northeast South Dakota. As the storms moved southeast, they began to tap into warmer, more humid air and rapidly evolve into a line of severe thunderstorms. Widespread damage occurred in a wide swath extending from Long Lake in McPherson County all the way into eastern Grant County and southern Big Stone County in Minnesota. The most extensive damage was generally found along and near US Highway 12 from Aberdeen to Milbank. Several observing stations in the path of this system measured wind speeds ranging from 70 mph to over 115 mph. Estimated wind speeds from damage surveys indicated even stronger winds with peak speeds of 120 mph. Over fifty communities in northeast South Dakota and the surrounding rural areas received minor to major tree and structural damage as straight line winds from 70 to 120 mph raced across the area. Webster and Waubay received the most extensive damage from the storms. Thousands of trees were snapped or uprooted, hundreds of grain bins were damaged or destroyed, hundreds of homes, businesses, and outbuildings were damaged or destroyed along with many power poles and miles of power lines downed. Many mobile homes, campers, and boats were damaged or destroyed along with many road and business signs. Countless homes, vehicles, and campers were also damaged by fallen trees. Thousands of acres of crops were also damaged or completely destroyed by the winds and hail. The greatest crop damage occurred in the Roslyn, Grenville, Eden, and Pickeral Lake areas in Marshall and Day counties. Many acres of corn were blown down and not able to come back. The large hail combined with the strong winds also broke out countless windows in homes and vehicles along with damaging the siding on homes. Thousands of people were left without power for up to several days. Large hay bales were moved up to 700 yards by the high winds. A semi was overturned on Highway 12 near Webster, injuring the driver. Near Milbank on Highway 12, two other semis were blown off the road resulting in injuries to both drivers. A State Forestry Specialist said it was one of the worst tree damage events he has ever seen in the Webster area. A fifty-eight year old man died two miles north of Waubay during the cleanup after the storms when he was pinned between a backhoe and a tree.

Record Highs: Record Lows:
Aberdeen: 106 (1987) Aberdeen: 42 (1903)
Kennebec: 109 (1955) Kennebec: 41 (1971)
Mobridge: 103 (1955) Mobridge: 48 (1948)
Pierre: 108 (1988) Pierre: 50 (1968)
Sisseton: 105 (1987) Sisseton: 48 (1952)
Timber Lake: 107 (1946) Timber Lake: 46 (1913)
Watertown: 104 (1988) Watertown: 41 (1903)
Wheaton: 104 (2006) Wheaton: 45 (1971)

Record Precipitation:
Aberdeen: 0.97" (1917)
Kennebec: 1.35" (1997)
Mobridge: 0.88" (1975)
Pierre: 1.06" (1959)
Sisseton: 1.77" (2008)
Timber Lake: 0.62" (1993)
Watertown: 0.87" (1940)
Wheaton: 1.43" (1944) is the U.S. government's official web portal to all federal, state and local government web resources and services.