The eastern United States has seen a second pulse of springlike warmth this week. Temperatures are at least 20 to 30 degrees above normal from Alabama to Michigan. Washington has hit at least 60 degrees on each of the first four days of January for the first time. This surge of winter warmth commenced Monday, with a focus on the South. The warmth in the East is a response to the stormy weather in California. Warm spells in Europe and the U.S. are examples of how human-caused climate change is increasing the frequency of high temperatures.
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