By JOHN MYERS JR. and DÁNICA COTO Associated Press

KINGSTON, Jamaica (AP) — Heavy floodwaters swept across southwestern Jamaica, winds tore roofs off buildings and boulders tumbled into roads Tuesday as Hurricane Melissa came ashore as a catastrophic Category 5 storm, one of the strongest Atlantic hurricanes on record.

Desmond McKenzie, deputy chairman of Jamaica’s Disaster Risk Management Council, urged people to seek shelter and stay indoors as the storm crosses the island.

“Jamaica, this is not the time to be brave,” he said.

The streets in the capital, Kingston, remained largely empty as Melissa approached, save for the lone stray dog crossing puddles and a handful of people walking briskly under tree branches waving in a stiff wind.

The Jamaican government said it had done all it could to prepare as it warned of devastating damage from the strongest hurricane to hit the island since recordkeeping began 174 years ago.

“There is no infrastructure in the region that can withstand a Category 5,” Prime Minister Andrew Holness said. “The question now is the speed of recovery. That’s the challenge.”

Landslides, fallen trees and numerous power outages were reported as Melissa came ashore near New Hope, with officials in Jamaica cautioning that the cleanup and damage assessment could be slow. The storm is expected slice diagonally across the island and head for Cuba.

Massive wind damage is expected in Melissa’s core and Jamaica’s highest mountains could see gusts of up to 200 mph (322 kph), said Michael Brennan, director of the U.S. National Hurricane Center in Miami.

“It’s going to be a very dangerous scenario,” he said, warning that there would be “total building failures.”

Hurricane Melissa’s 185 mph (295 kph) winds and 892 millibars of central pressure tied two records for the strongest Atlantic storm on landfall. The pressure — the key measurement meteorologists use — ties 1935’s Labor Day hurricane in Florida. The wind speed ties the 1935 hurricane and 2019’s Hurricane Dorian, said hurricane scientists Phil Klotzbach of Colorado State University and Brian McNoldy of the University of Miami.

“It’s been a remarkable just a beast of a storm,” Klotzbach told The Associated Press.

Jamaica prepares for the aftermath

On Tuesday afternoon, Melissa had top sustained winds of 165 mph (270 kph) and was moving north-northeast at 8 mph (13 kph), according to the National Hurricane Center. The hurricane was centered about 20 miles (35 kilometers) south-southwest of Montego Bay, Jamaica, and about 230 miles (370 kilometers) southwest of Guantánamo, Cuba.

A life-threatening storm surge of up to 13 feet (4 meters) is expected across southern Jamaica, with officials concerned about the impact on some hospitals along the coastline. Health Minister Christopher Tufton said some patients were relocated from the ground floor to the second floor, “and (we) hope that will suffice for any surge that will take place.”

One man called a local radio station and said he urgently needed to help a woman in western Jamaica who had gone into labor as the storm prepared to make landfall. The show’s host pleaded with listeners to let the man know the safest hospital for the woman before an obstetrician called in to provide detailed directions on how to deliver a baby, if necessary.

Colin Bogle, a Mercy Corps adviser based near Kingston, said most families are sheltering in place despite the government ordering evacuations in flood-prone communities. He was sheltering with his grandmother in Portmore, where everything went dark earlier in the morning after a loud explosion.

“The noise is relentless,” he said. “People are anxious and just trying to hold on until the storm passes.”

McKenzie said the government was prepared for rescues immediately after the storm passes through: “We have boats, helicopters, you name it.”

The storm already was blamed for seven deaths in the Caribbean, including three in Jamaica, three in Haiti and one in the Dominican Republic, where another person remains missing.

More than 240,000 customers were without power before landfall and about one-fourth of the telecommunications system was offline, said Darryl Vaz, transport and energy minister. He said crews will clean and run tests at the island’s two main international airports Wednesday in hopes of receiving emergency relief flights as early as Thursday.

U.N. agencies and dozens of nonprofits had food, medicine and other essential supplies positioned as they awaited a distribution rush after the storm.

Matthew Samuda, Jamaica’s water and environment minister, said he had more than 50 generators available to deploy after the storm, but warned people to set aside clean water and use it sparingly.

“Every drop will count,” he said.

Melissa takes aim at Cuba

Melissa was expected to make landfall in eastern Cuba late Tuesday or early Wednesday. Up to 20 inches (51 centimeters) of rain were forecast in areas, along with a significant storm surge along the coast.

Authorities in eastern Holguín province prepared to evacuate more than 200,000 people Tuesday and evacuated a similar number of people earlier from the town of Banes.

Reports on social media and state television showed blue and white buses ferrying evacuees to shelter early Tuesday. Families clutched babies and belongings and elderly people steadied themselves with canes as they disembarked.

“This phenomenon is very dangerous,” Deputy Prime Minister Eduardo Martínez said in a statement. “It is unprecedented.”

Cuban officials said Monday that they would evacuate more than 600,000 people from the region, including Santiago, the island’s second-largest city.

Melissa also has drenched the southern regions of Haiti and the Dominican Republic, with a tropical storm warning still in effect for Haiti. The hurricane was forecast to turn northeast and strike the southeast Bahamas by Wednesday evening.

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Coto reported from San Juan, Puerto Rico. Associated Press writers Geir Moulson in Berlin, Andrea Rodríguez in Havana and Seth Borenstein in Washington contributed to this report.