Cyclone the storm is forecast to strengthen into a infrequent highest-level storm as it turns toward the Caribbean island, causing life-threatening flash flooding and landslides.
The cyclone, which registered winds of up to 120 miles per hour as of 6:00 AM GMT, is currently turning toward the northwest in the Caribbean Sea and is expected to make landfall by midweek, according to meteorological authorities.
Warnings of power cuts and damage to infrastructure have been released as this storm produces up to 30 inches of rain and storm surges as high as 13ft above normal levels. "Take cover without delay," residents have been urged.
The cyclone is the 13th named hurricane in the ongoing Atlantic hurricane season, which normally finishes in November.
A category five storm is the most intense classification, with wind speeds of at least 252 km/h.
Even though this storm is projected to diminish in strength to a Category 4 cyclone before arriving at the island, experts said there was "very little practical difference in the total effects" upon landfall, and that the hurricane will be "just as powerful" when it strikes the country.
With storm-force winds and rain already expected long before it passes over central Jamaica - including potentially the national capital - alerts state that "safety measures need to be finalized quickly".
"Several days of harmful winds and intense precipitation has started and will cause severe and deadly rapid water accumulation and numerous landslides," counseled weather authorities.
Jamaican Prime Minister Andrew Holness stated: "I know that there are countless citizens who are worried, who are very concerned, and appropriately: concern is justified.
"Yet the optimal approach to handle worry and any unease and worry is to remain prepared."
Residents are being advised to protect their properties with sand barriers and timber panels, and to accumulate essentials.
Alerts are also in effect for areas in the neighboring country including the primary urban center, the Dominican Republic and eastern Cuba, where the hurricane is anticipated to bring similar effects by the middle of next week.
Landslides presently generated by the storm have resulted in two fatalities in Haiti, according to the nation's Civil Protection agency.
The hurricane is forecast to pass over Cuba by Wednesday before traveling via the Antillas Mayores and entering the Atlantic Ocean.
By the time it makes contact with the Caribbean nation, it is predicted to have weakened to a Category 3 hurricane.
Even though it is challenging to connect particular meteorological occurrences to climate change, scientists say it is resulting in meteorological events increasingly frequent and more severe.
Higher ocean heat produce more moisture in the environment, helping fuel the formation of tropical cyclones.
Before the start of this year's Caribbean cyclone season, climate agencies forecast above-normal activity, referencing heated marine conditions and possible stronger monsoon activity around African coastal regions - where tropical systems often form.
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