Cyclone the storm is projected to become a rare Category 5 cyclone as it shifts toward the Caribbean island, bringing life-threatening rapid inundation and mudslides.
This weather system, which recorded wind speeds of up to 195 km/h as of 0600 Greenwich Mean Time, is presently veering northwest in the Caribbean and is anticipated to make landfall by midweek, according to hurricane specialists.
Alerts of power cuts and disruption to utilities have been issued as this storm brings up to thirty inches of precipitation and storm surges as high as 4m above typical tides. "Find safe refuge immediately," locals have been told.
This hurricane is the 13th named storm in the ongoing Atlantic hurricane season, which typically ends in late autumn.
A Category 5 cyclone is the most powerful category, with wind speeds of at least 157 miles per hour.
While Melissa is expected to diminish in strength to a Category 4 cyclone before reaching the island, experts said there was "almost no noticeable change in the general consequences" upon landfall, and that the hurricane will be "equally strong" when it hits the nation.
With tropical storm-level wind and rainfall predicted to begin long before it crosses Jamaica's central region - perhaps encompassing the capital, Kingston - advisories emphasize that "preparations should be rushed to completion".
"An extended timeframe of damaging winds and heavy rainfall have begun and will cause devastating and dangerous rapid water accumulation and multiple mudslides," counseled weather authorities.
The country's head of government the statesman stated: "I understand that there are many Jamaicans who are anxious, who are deeply troubled, and with good reason: concern is justified.
"Yet the best way to address worry and any unease and anxiety is to remain prepared."
Locals are being instructed to secure their homes with sand barriers and plywood sheets, and to stock up on essentials.
Alerts are also active for regions of Haiti including the main city, Port au Prince, the Dominican Republic and Cuba's eastern region, where the hurricane is projected to bring comparable impacts by the middle of next week.
Rock slides already being caused by the storm have already killed two in Haiti, according to emergency services.
The hurricane is forecast to cross Cuba by midweek before passing across the Caribbean archipelago and emerging into the Atlantic.
By the time it reaches Cuba, it is forecast to have diminished to a category three storm.
Although it is difficult to connect particular meteorological occurrences to environmental shifts, researchers say it is causing meteorological events increasingly frequent and more extreme.
Increased sea temperatures create greater water vapor in the environment, helping fuel the development of storms.
Prior to the beginning of this season's Atlantic storm period, climate agencies forecast above-normal activity, citing elevated ocean temperatures and potential stronger monsoon activity around West Africa - where tropical systems frequently develop.
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