U.S. natgas futures seesaw ahead of weekly EIA storage data

* Front month hit highest mark since July 2011 on Monday * Below-normal temperatures remain on tap for consuming regions * Nuclear power plant outages still above normal * Coming Up: EIA natgas storage data 10:30 a.m. EDT (1430 GMT By Eileen Houlihan NEW YORK, April 18 (Reuters) - U.S. natural gas futures were little changed on Thursday, as forecasts for continued below-normal temperatures in consuming regions and above-normal nuclear power plant outages lent support ahead o