Natural-gas prices made their biggest gains Wednesday in more than two weeks as weather forecasts show a cooler start to spring. Natural gas for April delivery settled up 9.2 cents, or 3.4%, at $2.824 a million British thermal units on the New York Mercantile Exchange. It is the largest percentage gain since Feb. 20, and two winning sessions have now nearly cancelled out massive losses from Monday. Short sellers–investors who bet prices would fall–likely bought back in to close out those trades, an analyst and trader said. Colder-than-normal weather now forecast for the last week of March and into April could be limiting a further collapse in prices, said Gene McGillian, an analyst at Tradition Energy. “We have maybe one last gasp of winter,” he said. Traders may also think that heavy withdrawals from stockpiles could buoy the market, Mr. McGillian added. Cold weather has been […]