Natural gas rallied to a two-week high Friday as weather forecasts suggested a spreading Arctic chill could both increase heating demand and reduce gas production. The front-month March contract settled up 9.1 cents, or 3.4%, at $2.804 a million British thermal units on the New York Mercantile Exchange. Four winning sessions out of five put gas up 8.7% for the week, its largest one-week gains since November. Gas had posted losses as large as 2.1% Friday morning but started to reverse around 10 a.m. EST. The rally accelerated around noon. Noon weather updates showed even colder weather than already anticipated, WeatherBELL Analytics LLC said in a note to clients. About half of all U.S. homes use natural gas for home heating, making winter cold one of the biggest drivers for demand. Arctic air is going to cover most of the East […]