Prime Minister Andrew Holness declared the island a "disaster area" and authorities warned residents to remain sheltered over continued flooding and landslide risk, as dangerous weather persisted even as the hurricane's worst moved on.
The scale of Melissa's damage in Jamaica wasn't yet clear, as a comprehensive assessment could take days and much of the island was still without power, with communications networks badly disrupted.
At its peak, the storm packed ferocious sustained winds of 185 miles (300 kilometers) per hour. Immediate details regarding casualty figures were not available.
Government minister Desmond McKenzie said several hospitals had been damaged, including in the hard-hit southwestern district of Saint Elizabeth, a coastal area he said was "underwater."
"The damage to Saint Elizabeth is extensive, based on what we have seen," he told a briefing.
"Saint Elizabeth is the bread basket of the country, and that has taken a beating. The entire Jamaica has felt the brunt of Melissa."
The hurricane was the worst to ever strike Jamaica, hitting land with maximum wind speeds even more potent than most of recent history's most brutal storms, including 2005's Katrina, which ravaged the US city of New Orleans.
The storm took hours to cross over the Caribbean nation, a passage over land that diminished its winds, dropping by Tuesday evening down to a Category 3 storm from the top-level of 5.
But the still-powerful Melissa was set to hit Cuba as soon as Tuesday night and later the Bahamas.
- 'Severely damaged infrastructure' -
Even before Melissa slammed into Jamaica, seven deaths -- three in Jamaica, three in Haiti and one in the Dominican Republic -- had been blamed on the deteriorating conditions.
Jamaica's climate change minister told CNN that Hurricane Melissa's effect was "catastrophic," citing flooded homes and "severely damaged public infrastructure" and hospitals.
And as if that weren't enough: health authorities were urging vigilance against crocodiles displaced by the torrential rains.
"Rising water levels in rivers, gullies, and swamps could cause crocodiles to move into residential areas," the South East Regional Health Authority (SERHA) posted in a public service announcement on Instagram.
Mathue Tapper, 31, told AFP from Kingston that those in the capital were "lucky" but feared for fellow Jamaicans in the island's more rural areas.
"My heart goes out to the folks living on the Western end of the island," he said.
The mammoth storm could leave devastation on the scale of some of the worst hurricanes in recent memory like Katrina, Maria or Harvey.
- Climate change impact -
Broad scientific consensus says human-driven climate change is responsible for intensified storms like Melissa that are occurring with increased frequency and higher potential for destruction and deadly flooding.
Melissa lingered over Jamaica long enough that the rains were particularly dire.
"Human-caused climate change is making all of the worst aspects of Hurricane Melissa even worse," said climate scientist Daniel Gilford.
The Jamaican Red Cross, which was distributing drinking water and hygiene kits ahead of infrastructure disruptions, said Melissa's "slow nature" exacerbated the anxiety.
The UN is planning an airlift of some 2,000 relief kits to Jamaica from a relief supply station in Barbados once air travel is possible.
Assistance is also planned to other impacted countries including Cuba and Haiti, UN spokesperson Stephane Dujarric told journalits.
Jamaican officials said some 25,000 tourists were in the country famed for its normally crystalline waters.
Olympian sprinter Usain Bolt, one of Jamaica's most famous figures, meanwhile was posting regularly on social media with messages for his home country: "Pray for Jamaica."
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