Cyclone the storm is projected to strengthen into a rare highest-level hurricane as it shifts in the direction of the Caribbean island, bringing life-threatening flash flooding and landslides.
The cyclone, which registered wind speeds of up to 195 km/h as of 06:00 GMT, is now shifting north-west in the Caribbean region and is expected to hit the coast by early next week, as reported by meteorological authorities.
Warnings of electricity outages and structural damage have been announced as this storm generates up to 76cm of rainfall and storm surges as high as 13ft above normal levels. "Find safe refuge immediately," locals have been advised.
Melissa is the 13th named hurricane in the current Atlantic storm period, which typically ends in the eleventh month.
A category five hurricane is the strongest type, with wind speeds of at least 252 km/h.
Although the hurricane is set to weaken to a category four hurricane before arriving at the island, meteorologists said there was "minimal real distinction in the general consequences" upon making contact with land, and that the storm will be "equally strong" when it impacts the island.
With storm-force winds and rain predicted to begin well before it passes over central Jamaica - including potentially the capital, Kingston - alerts indicate that "safety measures need to be finalized quickly".
"A multi-day period of damaging winds and intense precipitation has started and will cause devastating and dangerous flash flooding and many mudslides," advised weather authorities.
The country's head of government the statesman said: "I realize that there are many Jamaicans who are worried, who are extremely apprehensive, and rightfully so: worry is natural.
"However the best way to address nervousness and any unease and worry is to stay ready."
Inhabitants are being instructed to secure their homes with protective bags and timber panels, and to gather necessary supplies.
Advisories are also active for regions of the neighboring country such as the main city, Port au Prince, the neighboring country and the eastern part of Cuba, where this storm is projected to bring analogous consequences by the middle portion of the coming week.
Mudslides presently generated by the cyclone have resulted in two fatalities in Haiti, according to local authorities.
This weather system is predicted to cross the island nation by midweek before passing across the Greater Antilles and entering the open ocean.
By the time it makes contact with the Caribbean nation, it is predicted to have reduced to a Category 3 storm.
While it is challenging to connect specific storms to global warming, researchers say it is causing meteorological events more prevalent and more extreme.
Higher ocean heat produce more moisture in the atmosphere, contributing to the creation of hurricanes.
Prior to the commencement of this season's Atlantic storm period, meteorological authorities projected higher-than-average occurrence, citing warmer seas and possible enhanced seasonal rains around the western African continent - where Atlantic storms typically originate.
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