* U.S. crude hit low just cents above 2015 bottom of $42.03
* Latest selloff triggered by big weekly big in Cushing (New throughout, updates prices and market activity; changes byline, new dateline, previous LONDON)
By Barani Krishnan
NEW YORK, Aug 13 (Reuters) - U.S. crude neared its lowest for 2015 on Thursday after refinery outages and data indicating a large build at the key U.S. delivery point for oil heightened worries about a global supply glut.
A rise in the dollar .DXY , after higher U.S. retail sales in July and strengthening employment data, added to the weight on oil. USD/ ID:nL1N10N14V ID:nL1N10N1R6
The front-month CLc1 in crude futures on the New York Mercantile Exchange was down $1.10, or 2.5 percent, at $42.20 a barrel by 10:55 a.m. EDT (1455 GMT). The session low was $42.07, just above the year's bottom of $42.03 hit in March.
The front-month in global crude benchmark Brent LCOc1 was down 60 cents, or 1.2 percent, at $49.06 a barrel.
Brent's premium towards U.S. crude rose to a three-week high of nearly $7 a barrel.
U.S. crude has sank 10 percent since the start of August, adding to July's decline of 21 percent, after refinery outages added to concerns of building supplies.
Traders said repairs at BP Plc's BP.L refinery Whiting, Indiana that could last at least a month, idling some 240,000 barrels per day of crude distillation. ID:nL1N10O1DP ID:nL1N10M1SV
On Thursday, market intelligence firm Genscape reported a build of more than 1.3 million barrels at the Cushing, Oklahoma delivery point for U.S. crude futures during the week to Aug. 11, according to traders who saw the data.