
(Corrects temperature in America's coldest spot to minus 39 F in, instead of minus 30 F, in paragraph 8)
WORCESTER, Mass. (Reuters) -A powerful arctic blast swept into the U.S. Northeast on Friday, pushing temperatures to perilously low levels across the region, including New Hampshire's Mount Washington, where the wind chill dropped to 105 degrees below zero Fahrenheit (-79 Celsius), forecasters said.