1925 - Nashville, TN, was blanketed with an inch of snow, their earliest measurable snow of record.
1947 - In a typical atmosphere, temperature decreases with height. The opposite of this, a temperature inversion, can trap unwanted particles close to the ground. For instance, on this date in 1947, the Donora, Penn. smog disaster ended after five days. For five days an inversion trapped impurities in the lower atmosphere over the Monongahela Valley killing 20 persons, and leaving more than 2000 others sick.
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