Arctic air is on the move across western and central Canada and will soon sweep into the western and central United States later this week before reaching the East by midmonth. Energy demands will surge, and the cold may be so severe as to put those exposed at risk for serious health concerns, while frozen pipes may lead to extensive property damage, AccuWeather meteorologists warn. The bulk of the cold air will blast in behind a potent storm hitting the Northwest into Wednesday. That storm will