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For Christmas Eve, a storm’s trailing cold front will arrive in the East, triggering heavy rain, locally severe thunderstorms, and possible flash flooding. The greatest flood threat will occur in the Northeast, where runoff may be enhanced by rapidly melting snow. In the storm’s wake, sharply colder air will cover the Midwest and East for Christmas Day, while snow showers and squalls will linger across the Appalachians and downwind of the Great Lakes.

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