Cyclone Melissa is predicted to escalate to a rare category five storm as it veers towards the Caribbean island, bringing dangerous flash flooding and landslides.
This weather system, which recorded winds of up to 195 km/h as of 06:00 GMT, is now shifting toward the northwest in the Caribbean region and is anticipated to make landfall by midweek, according to hurricane specialists.
Advisories of power cuts and structural damage have been announced as this storm generates up to thirty inches of rainfall and sea level surges as high as 4m above normal levels. "Find safe refuge immediately," inhabitants have been urged.
Melissa is the 13th hurricane in the current Atlantic hurricane season, which typically ends in late autumn.
A highest-level cyclone is the strongest type, with winds of at least 157 miles per hour.
Although the hurricane is projected to reduce in intensity to a fourth-level storm before arriving at Jamaica, experts said there was "almost no noticeable change in the overall impacts" upon landfall, and that the hurricane will be "just as powerful" when it hits the nation.
With tropical storm-level wind and rainfall anticipated well in advance well before it passes over the island's interior - including potentially the capital, Kingston - alerts emphasize that "readiness efforts must be accelerated".
"A multi-day period of damaging winds and heavy rainfall have begun and will cause catastrophic and life-threatening sudden floods and numerous mudslides," urged meteorological officials.
Jamaican Prime Minister Andrew Holness said: "I realize that there are many Jamaicans who are concerned, who are very concerned, and rightfully so: you should be concerned.
"However the best way to manage worry and any apprehension and worry is to stay ready."
Residents are being advised to fortify their houses with sandbags and wooden boards, and to gather basic necessities.
Alerts are also in effect for areas in Haiti including the primary urban center, the neighboring country and eastern Cuba, where the hurricane is projected to bring analogous consequences by the middle portion of the coming week.
Rock slides already being caused by the storm have resulted in two fatalities in Haiti, according to emergency services.
The hurricane is predicted to cross the island nation by midweek before moving through the Caribbean archipelago and entering the Atlantic Ocean.
By the moment it reaches the Caribbean nation, it is predicted to have reduced to a third-level hurricane.
While it is challenging to link specific storms to climate change, scientists say it is resulting in weather phenomena increasingly frequent and more severe.
Higher ocean heat generate more moisture in the air, aiding in the development of tropical cyclones.
Ahead of the start of the current Caribbean cyclone season, climate agencies predicted increased storm frequency, mentioning warmer seas and possible stronger monsoon activity around African coastal regions - where hurricanes often form.
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