The Caribbean storm — among the most powerful in history, with 185 mph winds — is expected to bring flash-flooding and landslides as it slowly moves across the island and heads north toward Cuba.

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Jamaica is expected to be in the storm's eyewall, which refers to the band of dense clouds surrounding the eye of the hurricane. The eyewall generally produces the fiercest winds and heaviest rainfall, according to Deanna Hence, a professor of climate, meteorology and atmospheric sciences at the University of Illinois Urbana-Champaign.