Cyclone the storm is predicted to escalate to a uncommon Category 5 cyclone as it veers in the direction of the Caribbean island, delivering deadly sudden floods and rock falls.
This weather system, which had wind speeds of up to 195 km/h as of 06:00 GMT, is currently turning north-west in the Caribbean region and is expected to make landfall by early next week, as reported by hurricane specialists.
Warnings of power cuts and structural damage have been issued as the hurricane generates up to thirty inches of rain and sea level surges as high as 4m above ground. "Seek shelter now," inhabitants have been urged.
This hurricane is the 13th named hurricane in this year's Atlantic season, which usually concludes in November.
A category five hurricane is the most intense classification, with wind speeds of at least 157mph.
Even though the hurricane is projected to diminish in strength to a category four hurricane before reaching the island, meteorologists said there was "almost no noticeable change in the general consequences" upon reaching the coast, and that the storm will be "just as powerful" when it impacts the island.
With storm-force wind and rainfall anticipated well in advance ahead of it moves across the island's interior - perhaps encompassing the capital, Kingston - advisories emphasize that "readiness efforts must be accelerated".
"Several days of damaging winds and heavy rainfall are underway and will cause catastrophic and life-threatening rapid water accumulation and many landslides," urged meteorological officials.
Jamaican Prime Minister the statesman stated: "I know that there are many Jamaicans who are anxious, who are very concerned, and appropriately: you should be concerned.
"However the best way to manage anxiety and any apprehension and anxiety is to stay ready."
Locals are being told to protect their properties with sand barriers and timber panels, and to gather basic necessities.
Alerts are also active for parts of the neighboring country including the main city, Port au Prince, the adjacent nation and eastern Cuba, where Melissa is projected to bring comparable impacts by the middle of next week.
Mudslides currently triggered by the hurricane have already killed two in the country, according to the nation's Civil Protection agency.
Melissa is projected to cross Cuba by midweek before moving through the Greater Antilles and entering the open ocean.
By the time it makes contact with Cuba, it is predicted to have diminished to a category three cyclone.
While it is hard to connect individual weather events to global warming, experts say it is resulting in meteorological events increasingly frequent and more severe.
Increased sea temperatures create more moisture in the environment, aiding in the formation of tropical cyclones.
Ahead of the commencement of this year's Caribbean cyclone season, meteorological authorities predicted increased storm frequency, mentioning elevated ocean temperatures and possible enhanced seasonal rains around African coastal regions - where tropical systems frequently develop.
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