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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February 14, 1967:

The heaviest snow fell in the central part of the state with Pierre receiving 10 inches with 14 inches reported near Harrold. Elsewhere, 1 to 4 inches of snow was common. Winds of 20 to 30 mph with gusts over 40 mph caused extensive drifting and blowing snow reducing visibilities to near zero at times. Many schools were closed and other activities canceled. Temperatures of 5 to 15 degrees below zero were common the morning of the 15th. A farmer died in the storm near Yale where his car stalled and he attempted to walk.

February 14, 1979:

High winds of 50 mph or higher and snow from a half inch to more than 14 inches moved through the state late on the 14th with winds slowly subsiding on the 16th. Visibility was reduced to near zero at the height of the storm and no travel was advised. Temperatures fell to 25 degrees below zero with wind chills to 80 to 90 below on the 15th. One man suffered frostbite after being stranded in his truck for seventeen hours. Power was lost at Wall due to high winds snapping power lines together.

February 14, 1987:

Four to eight inches of snow fell across the northern and western parts of the state. Four inches fell at Aberdeen and five inches fell at Mobridge. The snow made roads slippery. Several accidents occurred in the northeast part of the state.

Record Highs: Record Lows:
Aberdeen: 60 (1913) Aberdeen: -30 (1936)
Kennebec: 74 (1954) Kennebec: -33 (1936)
Mobridge: 66 (1954) Mobridge: -34 (1936)
Pierre: 72 (1954) Pierre: -24 (1936)
Sisseton: 53 (1999) Sisseton: -26 (1936)
Timber Lake: 66 (1954) Timber Lake: -33 (1936)
Watertown: 55 (1934) Watertown: -32 (1936)
Wheaton: 51 (1999) Wheaton: -19 (1920)

Record Precipitation: Record Snowfall:
Aberdeen: 1.05" (1915) Aberdeen: 11.0" (1915)
Kennebec: 0.50" (1918) Kennebec: 5.0" (1918)
Mobridge: 1.20" (1918) Mobridge: 12.0" (1918)
Pierre: 0.42" (1995) Pierre: 5.5" (1967)
Sisseton: 0.50" (1935) Sisseton: 4.5" (1995)
Timber Lake: 0.58" (1915) Timber Lake: 5.0" (1935)
Watertown: 0.60" (1893) Watertown: 6.0" (1893)
Wheaton: 0.26" (1935) Wheaton: 6.0" (1923) is the U.S. government's official web portal to all federal, state and local government web resources and services.