There's nothing all that special about Tropical Storm Humberto on its own. A typical storm developing in what is a historically active time of year for the Atlantic basin, Humberto seems like a cut and dry case.

Yet since it formed east of the Leeward Islands on Wednesday afternoon, hurricane forecasters have warned that their predictions for the system could be less accurate than usual, spurring calls for vigilance from local meteorologists along the Gulf Coast.

But it's not Humberto itself that's throwing forecasters and hurricane models for a loop. It's the storm's proximity to a tropical wave over the Caribbean. With just about 750 miles between their centers, the systems could work together to create something rarely seen on our side of the globe: the Fujiwhara effect.

A phenomen

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