May Nymex natural gas (NGK24) on Friday closed down by -0.024 (-1.47%). May nat gas prices Friday tumbled to a 3-3/4 year nearest-futures low and closed moderately lower. Ample US nat-gas supplies and mild spring temperatures are weighing on gas prices. As of April 19, nat-gas inventories were +37.0% above their 5-year seasonal average, signaling ample nat-gas supplies. Also, mild temperatures that will curb heating and air-conditioning demand for nat-gas is bearish for prices after Atmospheric G2 said Friday that the forecast is shifting warmer across the central and eastern parts of the coun…