Natural gas closed with its first back-to-back gains in nearly a month, as an arctic chill settling over the eastern half of the U.S. raised heating-demand expectations through next week. The front-month March contract settled up 8 cents, or 3.1%, at $2.677 a million British thermal units on the New York Mercantile Exchange. Prices are up 3.8% from the 2 1/2-year low settlement from Friday during the first back-to-back gains since Jan. 13 and 14. High temperatures are unlikely to rise above 30 degrees Fahrenheit–and in some places not even into the teens–across the Northeast, Ohio Valley and Great Lakes regions, according to Weather Services International in Andover, Mass. These temperatures will be as much as 25 degrees below normal and will be part of a series of arctic fronts that sends cold air across the East for a […]