UPDATE 1-U.S. natgas futures edge higher, bounce off support

* Front month still below recent 21-month high * Weather expected to moderate over next two weeks * Nuclear power plant outages remain below average By Eileen Houlihan NEW YORK, May 8 (Reuters) - U.S. natural gas futures edged higher on Wednesday, bouncing off technical support after sinking to a more than one-month low on the spot chart amid milder, spring-like weather and expectations for another large weekly inventory build. Last week's unexpectedly large weekly inventor