August Nymex natural gas (NGQ24) on Monday closed down by -0.171 (-7.34%). Aug nat-gas prices Monday sank to a 2-1/4 month low and closed sharply lower. Nat-gas prices were undercut by forecasts for cooler US temperatures that would reduce demand from electricity providers to run air conditioning. Forecaster Maxar Technologies said Monday that forecasts have shifted cooler for the central part of the US for July 20-24. Nat-gas prices have underlying support from the outlook for hot US temperatures this summer, which could boost nat-gas demand from electricity providers to power air conditionin…