Hurricane Melissa strengthened into a Category 4 storm as it churned northwest through the Caribbean Sea on Sunday, taking a direct aim at Jamaica.

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.”