April Nymex natural gas (NGJ26) on Friday closed up +0.095 (+3.20%). Nat-gas prices settled sharply higher on Friday after US weather forecasts cooled, potentially boosting nat-gas heating demand.  On Friday, the Commodity Weather Group said forecasts shifted colder, though above-average temperatures are still expected to cover most of the US through the end of March.  Also, Friday's expiration of the April Nymex natural gas contract spurred short-covering and lifted prices. More News from Barchart Nat ...