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.

wasted no time strengthening and is in the southwestern Atlantic.

The 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 forecast Friday morning. Hurricane News: Get the latest hurricane updates and how communities are preparing, responding, and recovering.

Maximum sustained winds

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