Cyclone the storm is projected to become a infrequent category five hurricane as it veers in the direction of Jamaica, delivering dangerous flash flooding and rock falls.
This weather system, which had winds of up to 120 mph as of 06:00 GMT, is now shifting northwest in the Caribbean and is expected to make landfall by midweek, based on data from hurricane specialists.
Alerts of power cuts and structural damage have been announced as the hurricane generates up to thirty inches of precipitation and storm surges as high as 4m above ground. "Take cover without delay," residents have been advised.
This hurricane is the thirteenth hurricane in the ongoing Atlantic storm period, which normally finishes in the eleventh month.
A Category 5 hurricane is the most intense classification, with winds of at least 157mph.
While the hurricane is expected to diminish in strength to a fourth-level cyclone before arriving at the island, authorities said there was "very little practical difference in the general consequences" upon reaching the coast, and that the hurricane will be "at least that intensity" when it hits the country.
With tropical storm-strength gusts and precipitation anticipated well in advance long before it crosses Jamaica's central region - possibly even the national capital - advisories state that "readiness efforts must be accelerated".
"An extended timeframe of destructive gusts and heavy rainfall has started and will cause devastating and dangerous flash flooding and many landslides," counseled meteorological officials.
The nation's leader Andrew Holness commented: "I realize that there are countless citizens who are anxious, who are very concerned, and rightfully so: you should be concerned.
"Yet the most effective method to manage worry and any unease and worry is to stay ready."
Residents are being instructed to fortify their houses with protective bags and plywood sheets, and to gather essentials.
Alerts are also in effect for parts of Haiti encompassing the main city, Port au Prince, the adjacent nation and the eastern part of Cuba, where the hurricane is expected to bring analogous consequences by the middle of next week.
Landslides presently generated by the hurricane have resulted in two fatalities in Haiti, according to emergency services.
Melissa is forecast to pass over the island nation by Wednesday before moving through the Caribbean archipelago and emerging into the Atlantic Ocean.
By the moment it reaches the Caribbean nation, it is predicted to have weakened to a category three storm.
Even though it is hard to associate specific storms to environmental shifts, researchers say it is making meteorological events increasingly frequent and more extreme.
Warmer oceans create additional humidity in the atmosphere, aiding in the creation of hurricanes.
Before the commencement of this season's Atlantic storm period, weather organizations forecast above-normal activity, referencing warmer seas and likely more intense weather patterns around the western African continent - where hurricanes typically originate.
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