Oil edges up as storm hampers U.S. supply, glut forecasts weigh

NEW YORK (Reuters) - Oil futures edged up on Friday as U.S. Gulf of Mexico crude output was halved by disruptions caused by a tropical storm, but concerns over a global surplus in the months ahead limited gains. Brent crude futures were up 31 cents to $66.83 a barrel by 11:21 a.m. EDT (1521 GMT). U.S. West Texas Intermediate (WTI) crude futures gained 16 cents at $60.36 a barrel.Brent has climbed 4% so far this week while WTI was on track for a 4.9% rise. Both registered declines last..