Hurricane the storm is projected to strengthen into a uncommon category five hurricane as it veers in the direction of the Caribbean island, delivering deadly flash flooding and landslides.
This weather system, which registered wind speeds of up to 195 km/h as of 06:00 GMT, is currently turning north-west in the Caribbean and is anticipated to reach land by midweek, according to hurricane specialists.
Alerts of electricity outages and disruption to utilities have been announced as the hurricane brings up to 30 inches of precipitation and coastal flooding as high as 13ft above normal levels. "Find safe refuge immediately," inhabitants have been told.
Melissa is the 13th named cyclone in the ongoing Atlantic season, which usually concludes in November.
A category five storm is the strongest type, with sustained winds of at least 157mph.
Although this storm is set to weaken to a Category 4 storm before making landfall on Jamaica, authorities said there was "minimal real distinction in the general consequences" upon reaching the coast, and that the cyclone will be "equally strong" when it hits the country.
With storm-force gusts and precipitation already expected long before it moves across Jamaica's central region - possibly even the city of Kingston - warnings state that "preparations should be rushed to completion".
"A multi-day period of destructive gusts and heavy rainfall are underway and will cause catastrophic and life-threatening sudden floods and many landslides," counseled weather authorities.
The country's head of government Andrew Holness said: "I realize that there are countless citizens who are anxious, who are extremely apprehensive, and rightfully so: worry is natural.
"But the most effective method to handle nervousness and any apprehension and concern is to remain prepared."
Inhabitants are being instructed to protect their properties with protective bags and wooden boards, and to accumulate basic necessities.
Warnings are also active for areas in the neighboring country including the main city, Port au Prince, the adjacent nation and Cuba's eastern region, where Melissa is expected to bring analogous consequences by the middle portion of the coming week.
Landslides already being caused by the storm have already killed two in Haiti, according to local authorities.
This weather system is predicted to move across the island nation by Wednesday before passing across the Greater Antilles and entering the Atlantic.
By the point it arrives at Cuba, it is anticipated to have weakened to a category three storm.
Even though it is hard to link specific storms to climate change, experts say it is making climate patterns more common and more intense.
Higher ocean heat create greater water vapor in the environment, helping fuel the formation of tropical cyclones.
Ahead of the start of the current Atlantic hurricane season, climate agencies predicted increased storm frequency, mentioning heated marine conditions and possible more intense weather patterns around West Africa - where Atlantic storms typically originate.
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