Aug 15 (Reuters) - U.S. stock index futures extended gains in volatile trading on Thursday, after data showed retail sales surged in July, which could help ease worries of a recession.

At 8:33 a.m. ET, Dow e-minis 1YMcv1 were up 136 points, or 0.53%. S&P 500 e-minis EScv1 were up 15 points, or 0.53% and Nasdaq 100 e-minis NQcv1 were up 38 points, or 0.51%.

Moments before the data, Dow e-minis 1YMcv1 were up 90 points, or 0.35%. S&P 500 e-minis EScv1 were up 9.75 points, or 0.34%, and Nasdaq 100 e-minis NQcv1 were up 18.25 points, or 0.24%.

(Reporting by Medha Singh in Bengaluru; Editing by Sriraj Kalluvila)

((Medha.Singh@thomsonreuters.com; within U.S. +1646 223 8780, outside U.S. +91 80 6749 1130))

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