Cyclone the storm is forecast to strengthen into a infrequent category five storm as it turns in the direction of the Caribbean island, bringing dangerous rapid inundation and landslides.
The cyclone, which registered winds of up to 120 miles per hour as of 0600 Greenwich Mean Time, is presently veering north-west in the Caribbean region and is expected to make landfall by Tuesday, as reported by hurricane specialists.
Alerts of blackouts and structural damage have been announced as Melissa brings up to 30 inches of rain and sea level surges as high as 4m above ground. "Take cover without delay," locals have been urged.
Melissa is the thirteenth storm in the current Atlantic hurricane season, which normally finishes in November.
A highest-level hurricane is the most intense classification, with sustained winds of at least 157 miles per hour.
Although the hurricane is projected to diminish in strength to a category four storm before arriving at Jamaica, authorities said there was "minimal real distinction in the total effects" upon landfall, and that the storm will be "just as powerful" when it impacts the country.
With tropical storm-level wind and rainfall predicted to begin well before it crosses central Jamaica - possibly even the capital, Kingston - advisories emphasize that "readiness efforts must be accelerated".
"An extended timeframe of harmful winds and heavy rainfall are underway and will cause devastating and dangerous rapid water accumulation and many landslides," advised meteorological officials.
Jamaican Prime Minister the statesman stated: "I understand that there are countless citizens who are worried, who are very concerned, and with good reason: worry is natural.
"But the best way to address anxiety and any nervousness and anxiety is to stay ready."
Locals are being advised to secure their homes with sand barriers and timber panels, and to stock up on essentials.
Advisories are also active for regions of Haiti encompassing the primary urban center, the adjacent nation and Cuba's eastern region, where this storm is projected to bring similar effects by the middle of next week.
Mudslides already being caused by the hurricane have resulted in two fatalities in the country, according to the nation's Civil Protection agency.
Melissa is forecast to cross Cuba by the middle of the week before traveling via the Caribbean archipelago and emerging into the open ocean.
By the point it reaches Cuba, it is forecast to have diminished to a third-level hurricane.
Even though it is difficult to connect specific storms to environmental shifts, experts say it is resulting in climate patterns more common and more extreme.
Increased sea temperatures create additional humidity in the air, aiding in the creation of hurricanes.
Prior to the start of this year's Atlantic storm period, meteorological authorities predicted increased storm frequency, mentioning elevated ocean temperatures and potential stronger monsoon activity around West Africa - where Atlantic storms typically originate.