Hurricane Humberto showed rapid intensification and became a Category 5 storm at the 5 p.m. Saturday advisory from the National Hurricane Center. Humberto is now a Category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale.

Predictions on how Humberto could affect Florida and the U.S. are difficult due to the Fujiwhara effect. Humberto strengthened rapidly on Sept. 26 and is now a major Category 3 hurricane, according to the latest advisory from the National Hurricane Center.

Humberto has maximum sustained winds of nearly 100 mph and a minimum central pressure of 972 mb. It has been downgraded to a Category 3 storm. The hurricane is forecast to travel north-northwest before gradually turning to travel more northward, then east-northeast late Tuesday or Wednesday.

Hurricane Humberto is now a Category 5 storm, and Tropical Depression Nine is expected to strengthen into a hurricane by Tuesday, according to forecasts.

Effects from Hurricane Humberto and Invest 94L on the US remain difficult to predict, but risks along the coast between Florida and NC are rising.

"The Fujiwhara Effect was also observed during past hurricane seasons, such as with Hurricanes Hilary and Irwin in the Pacific (2017), and occasionally in the Atlantic when systems like Hurricane Sandy interacted with nearby disturbances," Mainolfi said.

Another five homes collapsed Tuesday into the churning Atlantic Ocean surf in North Carolina’s Outer Banks, the latest incident in what has become a common sight in recent years along the state’s erosion-plagued coast.

Five unoccupied houses along North Carolina’s Outer Banks collapsed into the ocean on Tuesday as Hurricanes Humberto and Imelda rumbled in the Atlantic, the National Park Service said, marking the latest private beachfront structures to fall into the surf there in recent years.