This Day in National/World Weather History ...
 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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July 20, 1901:

The temperature soared to 115 degrees in Ipswich, making it the hottest location in the state.

July 20, 1951:

From the southeast residential section of Watertown, an estimated F2 tornado moved east, passing near Kranzburg and Goodwin. One small home and several barns were destroyed. Damage was estimated at $30,000.

July 20, 2002:

An extremely strong severe thunderstorm moved over Rapid City and across the adjacent plains east of town. Downburst winds and the associated gust front caused damage along a nearly 30 mile long path. Extensive tree damage occurred throughout the eastern half of the city with countless trees and branches in excess of 24 inch diameter felled. Two roofs were torn off by the winds. Flying debris damaged numerous cars and buildings. The NWS office in downtown Rapid City measured an 80 mph wind gust, with meteorologists noting winds were sustained at 60 to 70 mph for 5 minutes. Ellsworth AFB wind equipment measured a 106 mph wind gust from the thunderstorm as it passed. Costs associated only with tree damage and cleaning up debris were conservatively estimated at $500,000.


Record Highs: Record Lows:
Aberdeen: 111 (1934) Aberdeen: 43 (1970)
Kennebec: 114 (1934) Kennebec: 42 (1970)
Mobridge: 115 (1934) Mobridge: 46 (1944)
Pierre: 115 (1934) Pierre: 46 (1970)
Sisseton: 102 (1934) Sisseton: 47 (1992)
Timber Lake: 105 (1960) Timber Lake: 45 (1944)
Watertown: 102 (2002) Watertown: 40 (1911)
Wheaton: 103 (1977) Wheaton: 44 (1971)

Record Precipitation:
Aberdeen: 1.56" (2001)
Kennebec: 1.38" (1919)
Mobridge: 2.39" (2001)
Pierre: 2.47" (1982)
Sisseton: 1.74" (2001)
Timber Lake: 1.25" (1995)
Watertown: 1.35" (2001)
Wheaton: 1.31" (1948)


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