-Natural-gas prices suffered their largest single-day drop in more than six months on Tuesday after forecasts for a heat wave turned more moderate, ending hopes for a late summer surge in gas demand to cool homes and offices. Natural gas for delivery in October fell 17.5 cents, or 4.3%, to $3.89 a million British thermal units on the New York Mercantile Exchange. The decline erased more than a week’s worth of gains in the market, and the drop was the largest in percentage terms since Feb. 27. The market opened lower, and the losses accelerated throughout the session. Prices had climbed on forecasts of scorching temperatures throughout the U.S. in the first two weeks of August. But natural-gas futures fell Tuesday after newly revised forecasts said temperatures would moderate after this week, with hot weather remaining only in pockets of the South, the Southeast and […]