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 30 July 1119 → The earliest tornado reported on the European mainland struck Vysehrad, Czechia (today Prague, Czech Republic). It destroyed the palace of a Czech duke.
 30 July 1997 → Two waterspouts moved onshore in northern Virginia Beach, VA. One tracked into Norfolk.
 30 July 1999 → At nine o'clock in the morning Chicago recorded its highest ever dew point temperature of 82 degrees. The temperature at the time was 88, resulting in a heat index of 108. The dew point is an indication of the amount of moisture in the air.

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October 25, 1989:

Low pressure over Nevada produced high winds in the southwestern U.S., and spread heavy snow into Utah. Winds gusted to 63 mph at the Mojave Airport in southern California. Snowfall totals in Utah ranged up to 12 inches at Snowbird, with 11 inches at Alta. "Indian Summer" type weather continued in the central and eastern U.S. Twenty cities in the north central U.S. reported record high temperatures for the date. Highs of 77 degrees at Alpena, Michigan and 81 degrees at Saint Cloud, Minnesota were the warmest of record for so late in the season. Record highs continued across central and northeast South Dakota. The record highs were 81 degrees at Aberdeen, 82 degrees at Mobridge and Sisseton, and a very warm 85 degrees at Wheaton.


Record Highs: Record Lows:
Aberdeen: 81 (1989) Aberdeen: 10 (1942)
Kennebec: 92 (1940) Kennebec: 7 (1962)
Mobridge: 82 (1989) Mobridge: 10 (1942)
Pierre: 88 (1940) Pierre: 14 (1997)
Sisseton: 82 (1989) Sisseton: 12 (1942)
Timber Lake: 81 (1940) Timber Lake: 10 (1942)
Watertown: 84 (1927) Watertown: 11 (1942)
Wheaton: 85 (1989) Wheaton: 14 (1919)

Record Precipitation:
Aberdeen: 0.67" (1956) Aberdeen: 2.0" (1919)
Kennebec: 0.93" (1956) Kennebec: 3.0" (2012)
Mobridge: 0.73" (1954) Mobridge: 1.6" (1954)
Pierre: 0.85" (1954)
Sisseton: 0.63" (2010) Sisseton: 2.0" (1942)
Timber Lake: 0.71" (1954) Timber Lake: 5.0" (1954)
Watertown: 0.45" (1970) Watertown: 1.5" (1919)
Wheaton: 0.57" (2008) Wheaton: 2.0" (2001)


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