MIAMI — Dangerous tropical weather brewed Friday in the Atlantic Ocean with Humberto intensifying into a major Category 3 hurricane and a system forecasters dubbed “Potential Tropical Cyclone Nine” striking the Caribbean and taking aim at the Southeast United States.

Hurricane Humberto had maximum sustained winds of 115 mph, the Miami-based National Hurricane Center said in an advisory. Humberto was expected to keep strengthening over the next several days and churned Friday afternoon about 430 miles northeast of the northern Leeward Islands.

Humberto could produce life-threatening surf and rip currents for the northern Leeward Islands, the Virgin Islands, Puerto Rico and Bermuda over the weekend, forecasters said.

Meanwhile, a tropical storm warning associated with Potential Tropical C

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