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- DictionaryCold snap/ˈkōld ˌsnap/
noun
- 1. a sudden, brief spell of cold weather.
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Weather phenomenon
A cold wave is a weather phenomenon that is distinguished by a cooling of the air. Specifically, as used by the U.S. National Weather Service, a cold wave is a rapid fall in temperature within a 24-hour period requiring substantially increased protection to agriculture, industry, commerce, and social activities. The precise criteria for a cold wave are the rate at which the temperature falls, and ... Wikipedia