Tropical Storm Melissa is projected to become a infrequent Category 5 hurricane as it turns toward the Caribbean island, bringing dangerous flash flooding and rock falls.
The cyclone, which had wind speeds of up to 195 km/h as of 0600 Greenwich Mean Time, is currently turning northwest in the Caribbean region and is expected to reach land by midweek, according to hurricane specialists.
Warnings of blackouts and damage to infrastructure have been released as Melissa brings up to thirty inches of rainfall and storm surges as high as 4m above normal levels. "Seek shelter now," residents have been advised.
Melissa is the 13th named storm in the current Atlantic hurricane season, which normally finishes in the eleventh month.
A highest-level cyclone is the strongest type, with wind speeds of at least 157mph.
While the hurricane is set to reduce in intensity to a Category 4 cyclone before arriving at Jamaica, experts said there was "very little practical difference in the total effects" upon landfall, and that the storm will be "at least that intensity" when it hits the country.
With tropical storm-strength wind and rainfall already expected ahead of it crosses central Jamaica - possibly even the national capital - warnings emphasize that "safety measures need to be finalized quickly".
"A multi-day period of harmful winds and heavy rainfall has started and will cause severe and deadly sudden floods and numerous landslides," urged weather authorities.
The country's head of government Andrew Holness stated: "I realize that there are many Jamaicans who are anxious, who are extremely apprehensive, and rightfully so: worry is natural.
"However the best way to manage worry and any apprehension and worry is to be prepared."
Residents are being instructed to fortify their houses with sand barriers and wooden boards, and to gather basic necessities.
Advisories are also active for parts of Haiti such as the capital, Port au Prince, the adjacent nation and the eastern part of Cuba, where Melissa is expected to bring similar effects by the midweek period.
Mudslides presently generated by the storm have resulted in two fatalities in the country, according to local authorities.
Melissa is projected to cross Cuba by the middle of the week before traveling via the Greater Antilles and emerging into the Atlantic Ocean.
By the moment it reaches the Caribbean nation, it is forecast to have diminished to a third-level hurricane.
Even though it is hard to connect specific storms to environmental shifts, experts say it is making weather phenomena increasingly frequent and more intense.
Higher ocean heat generate more moisture in the atmosphere, helping fuel the development of hurricanes.
Before the commencement of this season's Caribbean cyclone season, climate agencies predicted above-normal activity, referencing heated marine conditions and likely stronger monsoon activity around the western African continent - where tropical systems typically originate.
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