This Day in National/World Weather History ...
 18 December 1944 → The ships of the US Navy Task Force 38, seven fleet and six light carriers, eight battleships, 15 cruisers, and about 50 destroyers were operating about 300 miles east of Luzon in the Philippine Sea. A small but violent typhoon overtook the task force with relatively little warning. Many of the ships were caught near the center of the storm and buffeted by extreme seas and hurricane force winds. Three destroyers capsized and went down with practically all hands, while a cruiser, five aircraft carriers, and three destroyers suffered serious damage. Approximately 790 men were lost or killed. Fires occurred in three carriers when planes broke loose in their hangars and 146 planes on various ships were lost or damaged beyond economical repair by fires, impact damage, or by being swept overboard.
 18 December 1957 → An unusually late tornado outbreak for the time of year for so far north struck Missouri and Illinois. 18 tornadoes were rated F2 or greater. An F4 ripped through Jackson, Williamson, and Franklin counties in Illinois. Murphysboro was hard hit with 10 people killed. Sunfield, IL vanished completely as an F5 tornado swept it clean.

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August 30, 1896:

Castlewood recorded a low temperature of 30 degrees. This was the coldest temperature for the month of August, 1896 for the entire state of South Dakota.

August 30, 1977:

Street, underpass, and basement flooding resulted from near record to record rainfall in a four hour period in the Minneapolis and St. Paul Metropolitan Area. Reports of 6 to 7 inches of rainfall were reported in Hennepin County, causing extensive damage to 15 homes, with 365 homes and 8 businesses receiving partial damage.

Record Highs: Record Lows:
Aberdeen: 100 (1898) Aberdeen: 37 (2003)
Kennebec: 110 (2012) Kennebec: 32 (1935)
Mobridge: 101 (1961) Mobridge: 32 (1935)
Pierre: 107 (2000) Pierre: 42 (2003)
Sisseton: 95 (1961) Sisseton: 37 (2009)
Timber Lake: 101 (2012) Timber Lake: 34 (1935)
Watertown: 95 (1930) Watertown: 36 (1915)
Wheaton: 97 (1969) Wheaton: 31 (1931)

Record Precipitation:
Aberdeen: 2.08" (1939)
Kennebec: 3.73" (1999)
Mobridge: 2.53" (1951)
Pierre: 1.75" (1912)
Sisseton: 0.90" (1971)
Timber Lake: 2.52" (1951)
Watertown: 1.63" (1939)
Wheaton: 1.50" (2001) is the U.S. government's official web portal to all federal, state and local government web resources and services.