Two tropical cyclones are barreling through the Atlantic on a potential collision course — and if they clash, a freak weather event merging them into one monster storm could wreak havoc along the East Coast.

Tropical Storm Humberto formed in the North Atlantic Ocean Wednesday and is expected to become a major hurricane this weekend, while another system looming in the Caribbean may strengthen into Tropical Storm Imelda in the coming days, according to Fox Weather meteorologist Greg Diamond.

But if these two storms get too close, they could trigger the rare phenomenon known as the Fujiwhara Effect.

What is the Fujiwhara Effect?

The wild weather anomaly — named after Japanese meteorologist Sakuhei Fujiwhara in 1921 — sparks when two cyclones come within 900 miles of each other and begin

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