Hurricane Melissa strengthened into a Category 5 storm early Monday, unleashing torrential rain and threatening to bring catastrophic flooding to the northern Caribbean.

The storm's slow movement is expected to bring a deluge of rain to multiple countries in the Caribbean, and prolong its dangerous impacts over a period of several days.

Forecasters are warning residents of Jamaica to "seek shelter now," as Melissa, a Category 4 hurricane, is making its way toward the Caribbean island nation Sunday night.

Jamaica and other countries impacted by Hurricane Melissa will be getting help from organizations right here in South Florida.

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The intensity of a hurricane is measured by its maximum sustained wind speed, and when that speed increases by at least 35 miles per hour in a 24-hour period — or roughly two categories on the Saffir-Simpson Hurricane Scale — meteorologists call that “rapid intensification.”