Natural-gas prices gave up early gains and slid 1.4% Thursday after midday weather forecast revisions turned uniformly cooler over the next two weeks, slashing expectations for gas-fired electricity demand and knocking out a key driver of the market’s recent rally. Natural gas for September delivery lost 5.7 cents to settle at $3.876 a million British thermal units on the New York Mercantile Exchange, ending a three-session winning streak and giving back more than a third of its gains since the start of the month. The market opened higher, building on Wednesday’s close at a two-week high, and continued to rally into the 10:30 a.m. weekly release of U.S. government data on natural-gas inventories. But the market gave back some of those gains after the report’s release and turned solidly negative after the midday revisions to weather outlooks for the coming weeks. “We’re giving back today because […]