Rising temperatures offered some hope Friday for frustrated Texans days after they lost power — and in many cases heat — in a deadly winter storm, while a new wave of frigid weather rolling into the Northeast led communities to close schools and open warming centers. Wind chills in some higher elevations of the Northeast could punch below minus 50º (minus 45º Celsius) as an Arctic front swept in from Canada, forecasters said. In Texas, officials in Austin compared damage from fallen trees and iced-over power lines to tornadoes as they came under criticism for slow repairs and shifting timelines to restore power.