Natural-gas futures fell for a fourth straight session on expectations that the weather would turn milder later this month, reducing the need for gas-fueled heating. Signs of diminishing demand from power generators as they switch to less-expensive coal also knocked natural-gas futures lower, an analyst said. It is a turnaround for the natural-gas market, which had benefited from rising demand for the fuel amid a brutally cold winter. Natural gas for March delivery fell 19.6 cents, or 4.1%, to $4.579 a million British thermal units on the New York Mercantile Exchange, its lowest settlement since Jan. 21. Futures are down nearly 15% since Feb. 4. Kyle Cooper, managing director of research at IAF Advisors, attributed the slide to moderating temperature forecasts and tepid demand from power generators. […]