Cyclone the storm is predicted to escalate to a rare Category 5 storm as it turns in the direction of the Caribbean island, bringing dangerous rapid inundation and rock falls.
This weather system, which recorded wind speeds of up to 120 miles per hour as of 0600 Greenwich Mean Time, is presently veering northwest in the Caribbean and is expected to make landfall by midweek, based on data from meteorological authorities.
Warnings of electricity outages and disruption to utilities have been issued as the hurricane produces up to thirty inches of rain and storm surges as high as 4m above ground. "Take cover without delay," residents have been advised.
Melissa is the 13th named cyclone in the current Atlantic hurricane season, which normally finishes in November.
A category five hurricane is the most intense classification, with sustained winds of at least 157 miles per hour.
Although this storm is set to diminish in strength to a fourth-level hurricane before reaching Jamaica, meteorologists said there was "almost no noticeable change in the general consequences" upon landfall, and that the cyclone will be "just as powerful" when it strikes the country.
With tropical storm-level wind and rainfall predicted to begin well before it moves across Jamaica's central region - including potentially the national capital - alerts indicate that "preparations should be rushed to completion".
"An extended timeframe of destructive gusts and intense precipitation has started and will cause severe and deadly rapid water accumulation and many mudslides," counseled weather authorities.
Jamaican Prime Minister the official stated: "I understand that there are many Jamaicans who are worried, who are deeply troubled, and rightfully so: concern is justified.
"However the best way to address anxiety and any nervousness and concern is to be prepared."
Locals are being advised to fortify their houses with protective bags and wooden boards, and to gather basic necessities.
Alerts are also active for parts of Haiti including the main city, Port au Prince, the neighboring country and Cuba's eastern region, where Melissa is expected to bring similar effects by the midweek period.
Mudslides currently triggered by the storm have caused two deaths in Haiti, according to the nation's Civil Protection agency.
This weather system is forecast to cross Cuba by Wednesday before passing across the Caribbean archipelago and emerging into the Atlantic Ocean.
By the moment it arrives at the Caribbean nation, it is anticipated to have reduced to a Category 3 storm.
While it is hard to link specific storms to climate change, researchers say it is making weather phenomena increasingly frequent and more intense.
Increased sea temperatures produce more moisture in the air, contributing to the formation of storms.
Before the beginning of this season's Caribbean cyclone season, climate agencies predicted above-normal activity, citing heated marine conditions and possible enhanced seasonal rains around the western African continent - where hurricanes often form.
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