Natural-gas futures slid to their lowest close in nearly a year on Monday after weather forecasts signaled a late-season blast of warm weather into November, raising doubts about demand for gas-fired heating. Natural gas for November delivery fell 6.2 cents, or 1.7%, to $3.5610 a million British thermal units on the New York Mercantile Exchange, their lowest close since Nov. 19, 2013. Futures have fallen in eight of the last 10 trading sessions as robust production and lackluster demand have erased fears of a heating-season supply deficit. “The way the weather outlooks are leaning, it’s no surprise to see we’re selling off again,” said Matt Smith, an analyst with utility company Schneider Electric. “Any concerns the market had about supplies have just evaporated.” Weather forecasts indicate an above-normal temperature formation over much of the Midwest and stretching as far south as Texas as late as Nov. […]