KINGSTON, Jamaica (AP) — Hurricane Melissa strengthened into a major Category 4 hurricane, with the possibility of intensifying to a Category 5 storm Sunday night, unleashing torrential rain and threatening to cause catastrophic flooding in the northern Caribbean, including Haiti and Jamaica, the U.S. National Hurricane Center said.

The weather agency added Melissa is likely to reach the southern coast of Jamaica as a major hurricane late Monday or Tuesday morning, and urged people on the island to seek shelter immediately.

“I urge Jamaicans to take this weather threat seriously,” said Jamaican Prime Minister Andrew Holness. “Take all measures to protect yourself.”

Melissa was centered about 120 miles (195 kilometers) south-southeast of Kingston, Jamaica, and about 280 miles (450 kilome

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