Hurricane Humberto and a system that may become Tropical Storm Imelda in the coming days are swirling quite close to each other in the western Atlantic Ocean

The U.S. National Hurricane Center (NHC) expects Humberto to intensify into a major hurricane—and potentially a high-end Category 4 storm—by this weekend as it moves northwest through the open Atlantic Ocean.

A hurricane warning was in effect for the volcanic archipelago which could experience dangerous conditions from Gabrielle as early as Thursday.

At first glance, the two storms appear to have very similar tracks in the short term, and will be in very close proximity. But based on current forecast data, they will have very different outcomes.

Hurricane Humberto and Potential Tropical Cyclone Nine are in close proximity to each other and has meteorologists and forecasters watching for the potential for a rare phenomenon called the Fujiwhara effect.

Hurricane Humberto is officially brewing in the Atlantic, but a currently unnamed disturbance could be a bigger threat to South Carolina.

The storm is forecast to strengthen into a hurricane as it moves northwest across the Atlantic Ocean over the next few days.