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First Edition Preface Second Edition Preface Acknowledgments
cold wave—1. As used in the U.S. National Weather Service, a rapid fall in temperature within 24 hours to temperatures requiring substantially increased protection to agriculture, industry, commerce, and social activities. Therefore, the criterion for a cold wave is twofold: the rate of temperature fall, and the minimum to which it falls. The latter depends upon region and time of year. 2. Popularly, a period of very cold weather.
