March Nymex natural gas (NGH24) on Monday closed +0.003 (+0.14%). Nat-gas prices on Monday posted modest gains on a slightly colder U.S weather forecast. Meteorologist WSI said warmer temperatures are expected through Feb 10-14 for the eastern half of the U.S., but below-normal temperatures are expected for the south-central U.S and the West Coast. Nat-gas prices have sold off sharply over the past month and fell to a 9-month nearest-futures low last Friday as unseasonably warm U.S. temperatures have reduced heating demand for nat-gas. Forecaster Maxar Technologies said last Friday that the ea…