Round after round after round of Arctic air is poised to plunge into the central and eastern United States. AccuWeather meteorologists warn that each outbreak of Arctic air has the potential to bring colder air farther south than the previous round and will lead to a major surge in energy demands and the risk of freeze-related damage in the Southern states. The magnitude and extent of the Arctic air will build into the first full week of January and linger through the middle of the month and wil