May Nymex natural gas (NGK24) on Wednesday closed down by -0.021 (-1.13%). May nat gas prices on Wednesday fell back from a 3-week high and closed moderately lower. Long liquidation in nat-gas emerged Wednesday after updated weather forecasts called for warmer US temperatures, which will reduce heating demand for nat-gas. Forecaster Atmospheric G2 said Wednesday that spring warmth is expected for the eastern half of the US from April 8-12, while the west should see above-normal temperatures. Nat-gas prices have collapsed this year, with nearest-futures (NGJ24) posting a 3-3/4 year low last Tue…