March Nymex natural gas (NGH24) on Friday closed -0.129 (-7.45%). Nat-gas prices on Friday closed sharply lower as a shift in U.S. weather forecasts to warmer sent nat-gas prices tumbling. The Commodity Weather Group said “strong warmth” is expected for the mid-western to the eastern parts of the U.S. from March 4-8, reducing heating demand for nat-gas and keeping supplies elevated. U.S. nat-gas prices also had some negative carryover from a fall in European nat-gas prices Friday to a 2-3/4 year low. Nat-gas prices have collapsed this year and posted a 3-1/2 year nearest-futures low on Tuesday…