Natural-gas prices closed at a new six-month low for a second straight session with cooler weather and replenishing stockpiles sustaining a selloff that’s lasted since mid-June. Prices for the front-month August contract settled down 2.1 cents, or 0.5%, to $4.204 a million British thermal units on the New York Mercantile Exchange, the lowest settlement since Jan. 10. Prices dipped to $4.129 in midmorning, the lowest intraday price since Jan. 13. “A brutal few days for the market,” said Scott Gettleman, an independent trader in New York. “In the short term it’s a very big move.” Prices have fallen 11.7% since June 12, far enough that analyst Jim Ritterbusch advised clients Tuesday to stop pursuing spread trades that rely on rising prices into the fall. One trade put 6,000 contracts up for sale in one block, a sign that one firm may have been liquidating its […]