Natural-gas futures tumbled to a seven-month low Thursday, dropping below $4 a million British thermal units for the first time since December, following a government report showing greater-than-expected U.S. supplies. Producers added 107 billion cubic feet of gas to storage for the week ended July 11, the U.S. Energy Information Administration said. The addition was eight bcf larger than what analysts and traders had expected, and 42 bcf larger than the five-year-average addition for that week of the year. Natural gas for August delivery recently dropped by 15 cents, or 3.6%, to $3.969 a million British thermal units on the New York Mercantile Exchange. The selling is adding to a month of losses. Steady surpluses have convinced money managers to sell out, with prices now down 16.7% since June 12. Traders use the EIA update to gauge how quickly stockpiles are recovering from high demand […]