(Bloomberg) -- Hurricane Humberto is set to churn up potentially “life-threatening” surf across parts of the Caribbean this weekend after a day of gathering strength.

Humberto early Saturday was a Category 4 hurricane on the five-step Saffir-Simpson scale, having intensified rapidly on Friday as it hurtled through warm Atlantic waters, according to the US National Hurricane Center.

Though the storm isn’t forecast to strike land, energy from Humberto is expected to create “life-threatening surf and rip current conditions” on beaches in the northern Leeward Islands, the US Virgin Islands, Bermuda and Puerto Rico this weekend and early next week, NHC forecaster Brad Reinhart wrote.

By early Monday, a turn toward the northwest is forecast at at a slightly faster forward speed, followed by a

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