Natural-gas prices are sliding, a harbinger of spring. Heavy snowfall and deep cold in the Northeast states, a major gas-consuming region, briefly boosted prices above $3 a million British thermal units last month. Now, as temperatures turn mild, natural-gas demand is expected to ease as U.S. consumers no longer need to heat their homes. The front-month April contract is headed toward a three-year low, falling 3.9% last week to $2.7270 a million British thermal units on the New York Mercantile Exchange. “Even if it gets cold in the next couple of weeks, the demand is going to go away” as soon as the spring comes, said Marc Kerrest, who manages $1 million in his own gas-focused fund, Cornice Trading, in San Francisco. “We’re going to be left with a whole lot of gas.” Mr. […]