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Storm was a lightly carbonated, caffeinated lemon-lime flavored soft drink. It was test marketed by PepsiCo in some areas of the U.S. in 1998 as part of Pepsi's attempt to become more competitive in the U.S. clear lemon-lime soda market, one that was dominated by Coca-Cola's Sprite. Storm differed from Sprite in that its flavor was uniquely subtle and had a very slight bitterness to it, as well as having caffeine.