UPDATE 1-U.S. natgas futures edge higher ahead of EIA stocks data

* Weather outlook turns milder, limits upside * High inventories, record production weigh on sentiment * EIA, Enerdata gas storage data, EIA output data due Thurs NEW YORK, Feb 28 (Reuters) - U.S. natural gas futures held slim gains early on Thursday, backed by light buying ahead of what should be a bullish weekly inventory report though a milder change in extended weather forecasts limited the upside. Cold forecasts helped drive the front contract up nearly 10 percent over the