December Nymex natural gas (NGZ25) on Thursday closed down by -0.076 (-1.67%). Dec nat-gas prices gave up an early advance on Thursday and settled lower as US weather forecasts turned warmer, which could dampen heating demand for nat-gas.  Forecaster Atmospheric G2 said Thursday that temperatures shifted warmer over the northern US for November 25-29, and turned warmer across the middle of the country for November 30-December 4. More News from Barchart Nat-gas prices initially moved higher Thursday aft ...