Natural gas futures may drop (11 th March-15Th March,13) as a U.S. cold snap gives way to milder weather and higher prices make it a less attractive fuel for some electricity generators, a Bloomberg survey showed. Eight of 14 analysts, or 57 percent, forecast that gas futures will decline on the New York Mercantile Exchange through March 15. Four, or 29 percent, said futures will rise and two predicted that prices will stay the same. Last week, 55 percent of participants said gas prices would advance this week.