U.S. natgas futures rise for third straight session51 minutes ago by Thomson Reuters

* Front month still well below recent 21-month high    * Weather forecasts mixed throughout the nation    * Nuclear power plant outages remain above normal    * Coming Up: EIA natgas storage data on Thursday    By Eileen Houlihan    NEW YORK, May 15 (Reuters) - U.S. natural gas futures roseabout 1 percent early on Wednesday, extending gains for a thirdstraight session after a cool start to the week in the Northeastwas expected to further slow inventory builds.    Above-average nuclear power plant outages also helped tofirm near-term demand, traders said.    A long, cold winter put a huge dent in inventories and acool spring led to a slow start to the injection season, butforecasts for milder weather later this month should finallycurb any lingering heating loads before heavy cooling demandkicks in.    As of 9:15 a.m. EDT (1315 GMT), front-month June natural gasfutures on the New York Mercantile Exchange were at$4.063 per million British thermal units, up 3.9 cents, or justunder 1 percent.    The contract hit a one-month low of $3.883 last week afterclimbing to a 21-month high of $4.444 on May 1.    The latest National Weather Service six to 10-day forecastissued on Tuesday called for above-normal temperatures in theNortheast and Southwest and below-normal readings along the GulfCoast and in the Northwest and other northern-tier states.    Nuclear plant outages totaled 19,500 megawatts, or 19percent of U.S. capacity, down from 20,100 MW out on Tuesday,but up from 16,200 MW out a year ago and a five-year averageoutage rate of 19,100 MW.     Early injection estimates for Thursday's EIA gas storagereport range from 90 bcf to 106 bcf, versus a 56-bcf build inthe same week last year and a five-year average rise for thatweek of 83 bcf.