Humberto has strengthened into the season's third hurricane.

Humberto is forecast to continue strengthening and is expected to be a Category 4 storm over the weekend.

Predictions on how Humberto could affect Florida and the U.S. are difficult due to the Fujiwhara effect.

Humberto wasted no time strengthening and is now a hurricane in the southwestern Atlantic.

The National Hurricane Center is forecasting Humberto will continue growing stronger and become a Category 4 storm over the weekend, according to its 5 a.m. advisory.

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"Humberto is showing signs of steady-to-rapid intensification," the Hurricane Center said as it increased its intensity fo

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