March Nymex natural gas (NGH26) on Monday closed down by -0.062 (-2.03%). March nat-gas prices gave up an early advance on Monday and settled lower after updated US weather forecasts called for above-normal temperatures into the first week of March, potentially reducing nat-gas heating demand.  On Monday, the Commodity Weather Group said above-average temperatures are expected across the eastern half of the US through March 9.   Nat-gas prices initially moved higher on Monday after weather forecasts calle ...