April Nymex natural gas (NGJ24) on Wednesday closed +0.077 (+4.26%). Nat-gas prices on Wednesday climbed to a 3-week high as funds rolled long positions into the April nat-gas contract from the March contract that expired on Tuesday. However, above-average U.S. winter temperatures may keep nat-gas prices from a sustainable rally in the near term. NatGasWeather said Wednesday that weather forecasts for much of the U.S. “remain exceptionally warm and bearish” for March 1-13. Nat-gas prices have collapsed this year and plunged to a 3-1/2 year nearest-futures low (H24) this week as an unusually mi…