August Nymex natural gas (NGQ24) on Friday closed up by +0.061 (+2.69%). Aug nat-gas prices Friday recovered from a 2-month low and posted moderate gains. Short-covering emerged in nat-gas futures Friday after the dollar index tumbled to a 5-week low. The weather picture is mixed for nat-gas prices. The Commodity Weather Group said Friday that cooler weather is expected in the central US July 17-21, while intense heat is forecast for the Northwest. Nat-gas prices have underlying support from the outlook for hot US temperatures this summer, which could boost nat-gas demand from electricity prov…