Humberto, which elevated to a Category 4 hurricane Friday (September 26) morning, could potentially interact with another system to become a rare monster storm, CBS News reports.

Officials at the National Hurricane Center said they were monitoring a second storm near Humberto over the northeastern Caribbean , which would likely be named Imelda as a tropical storm over the weekend. Imelda's system is expected to strengthen in the Bahamas, leading to wind and rainfall striking the coastal parts of the southeastern U.S. and, although considered to be very unlikely, could merge with Humbero to produce what is called the Fujiwhara effect.

The Fujiwhara effect is "an intense dance" between two tropical storms in which they get close enough and either join together or spin around each oth

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