Cyclone the storm is predicted to escalate to a rare highest-level storm as it turns toward the Caribbean island, causing dangerous flash flooding and landslides.
This weather system, which registered winds of up to 120 miles per hour as of 06:00 GMT, is now shifting north-west in the Caribbean and is anticipated to reach land by early next week, as reported by meteorological authorities.
Warnings of electricity outages and damage to infrastructure have been issued as the hurricane produces up to 76cm of rainfall and coastal flooding as high as 13ft above normal levels. "Seek shelter now," inhabitants have been told.
The cyclone is the 13th storm in the current Atlantic season, which usually concludes in late autumn.
A category five storm is the strongest type, with wind speeds of at least 252 km/h.
Even though the hurricane is expected to weaken to a Category 4 storm before reaching Jamaica, authorities said there was "almost no noticeable change in the general consequences" upon reaching the coast, and that the hurricane will be "at least that intensity" when it strikes the country.
With tropical storm-strength gusts and precipitation predicted to begin ahead of it passes over central Jamaica - perhaps encompassing the city of Kingston - alerts indicate that "preparations should be rushed to completion".
"A multi-day period of damaging winds and heavy rainfall are underway and will cause catastrophic and life-threatening sudden floods and multiple rock slides," counseled climate experts.
The nation's leader the official commented: "I realize that there are numerous residents who are anxious, who are very concerned, and appropriately: concern is justified.
"However the most effective method to handle worry and any unease and concern is to remain prepared."
Locals are being told to protect their properties with sand barriers and wooden boards, and to stock up on essentials.
Advisories are also ongoing for regions of Haiti such as the capital, Port au Prince, the Dominican Republic and the eastern part of Cuba, where Melissa is anticipated to bring similar effects by the middle portion of the coming week.
Rock slides presently generated by the hurricane have already killed two in the country, according to the nation's Civil Protection agency.
The hurricane is predicted to pass over Cuba by the middle of the week before moving through the Antillas Mayores and emerging into the open ocean.
By the moment it reaches the Caribbean nation, it is forecast to have diminished to a Category 3 storm.
While it is difficult to connect particular meteorological occurrences to global warming, experts say it is resulting in climate patterns more common and more intense.
Increased sea temperatures produce more moisture in the atmosphere, aiding in the development of hurricanes.
Before the commencement of the current Caribbean cyclone season, meteorological authorities predicted higher-than-average occurrence, mentioning elevated ocean temperatures and possible more intense weather patterns around West Africa - where Atlantic storms frequently develop.
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Alexander Bryant
Alexander Bryant
Alexander Bryant
Alexander Bryant