Cyclone the storm is predicted to become a uncommon highest-level hurricane as it shifts towards Jamaica, causing life-threatening sudden floods and mudslides.
The hurricane, which recorded wind speeds of up to 195 km/h as of 06:00 GMT, is currently turning north-west in the Caribbean Sea and is projected to make landfall by Tuesday, as reported by weather experts.
Alerts of blackouts and damage to infrastructure have been issued as Melissa brings up to 76cm of precipitation and sea level surges as high as thirteen feet above typical tides. "Seek shelter now," locals have been advised.
This hurricane is the thirteenth cyclone in the ongoing Atlantic storm period, which typically ends in late autumn.
A Category 5 hurricane is the strongest type, with sustained winds of at least 157 miles per hour.
Even though Melissa is expected to diminish in strength to a fourth-level cyclone before arriving at Jamaica, experts said there was "almost no noticeable change in the overall impacts" upon reaching the coast, and that the storm will be "at least that intensity" when it impacts the nation.
With storm-force gusts and precipitation anticipated well in advance ahead of it moves across central Jamaica - possibly even the city of Kingston - advisories state that "safety measures need to be finalized quickly".
"Several days of destructive gusts and intense precipitation are underway and will cause devastating and dangerous flash flooding and numerous landslides," urged meteorological officials.
The nation's leader Andrew Holness commented: "I understand that there are numerous residents who are worried, who are deeply troubled, and appropriately: you should be concerned.
"But the most effective method to handle worry and any apprehension and concern is to stay ready."
Locals are being told to fortify their houses with sandbags and wooden boards, and to gather basic necessities.
Alerts are also in effect for parts of the neighboring country such as the main city, Port au Prince, the Dominican Republic and eastern Cuba, where this storm is expected to bring similar effects by the middle portion of the coming week.
Landslides currently triggered by the hurricane have caused two deaths in Haiti, according to the nation's Civil Protection agency.
This weather system is projected to move across the island nation by the middle of the week before passing across the Caribbean archipelago and out into the open ocean.
By the point it makes contact with Cuba, it is anticipated to have diminished to a third-level storm.
Even though it is hard to connect individual weather events to environmental shifts, scientists say it is resulting in meteorological events increasingly frequent and more severe.
Warmer oceans create additional humidity in the atmosphere, helping fuel the formation of tropical cyclones.
Prior to the beginning of the current Atlantic storm period, meteorological authorities projected above-normal activity, citing elevated ocean temperatures and possible stronger monsoon activity around African coastal regions - where Atlantic storms frequently develop.
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