Tropical Storm Imelda formed Sunday, joining the monster Hurricane Humberto in the Atlantic, and forecasters warned it'll likely bring heavy rains to the Carolinas.

The big picture: Imelda is expected to strengthen over the Bahamas on Monday and become a major hurricane that night or early Tuesday. Forecasters expect the U.S. East Coast to be spared the worst of it — though there's a chance of heavy rainfall in the Southeast, and the Carolinas could see several inches of rain that may trigger flooding. • National Hurricane Center deputy director Jamie Rhome said in a Sunday evening video post that while the impacts for the U.S. "are coming down, they're not zero, there will still be some impact for the East Coast United States."

Threat level: "Storm total rainfall amounts of 2 to 4 inc

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