Hurricane the storm is projected to escalate to a infrequent highest-level storm as it turns toward the Caribbean island, causing deadly rapid inundation and mudslides.
The cyclone, which had wind speeds of up to 120 miles per hour as of 6:00 AM GMT, is presently veering toward the northwest in the Caribbean Sea and is projected to make landfall by midweek, based on data from weather experts.
Alerts of power cuts and disruption to utilities have been issued as Melissa brings up to thirty inches of rainfall and sea level surges as high as thirteen feet above typical tides. "Seek shelter now," locals have been told.
Melissa is the 13th named storm in the current Atlantic hurricane season, which typically ends in November.
A Category 5 cyclone is the most intense classification, with sustained winds of at least 252 km/h.
Although the hurricane is expected to reduce in intensity to a category four hurricane before reaching Jamaica, meteorologists said there was "very little practical difference in the general consequences" upon making contact with land, and that the storm will be "just as powerful" when it strikes the country.
With tropical storm-strength winds and rain already expected ahead of it passes over the island's interior - including potentially the capital, Kingston - advisories indicate that "preparations should be rushed to completion".
"A multi-day period of damaging winds and heavy rainfall have begun and will cause severe and deadly flash flooding and many landslides," advised climate experts.
Jamaican Prime Minister Andrew Holness commented: "I know that there are numerous residents who are concerned, who are deeply troubled, and with good reason: you should be concerned.
"Yet the most effective method to address worry and any nervousness and worry is to stay ready."
Residents are being told to protect their properties with protective bags and wooden boards, and to accumulate essentials.
Advisories are also in effect for areas in Haiti such as the main city, Port au Prince, the adjacent nation and eastern Cuba, where this storm is expected to bring analogous consequences by the middle of next week.
Mudslides currently triggered by the hurricane have caused two deaths in the country, according to the nation's Civil Protection agency.
This weather system is projected to pass over the island nation by the middle of the week before moving through the Caribbean archipelago and entering the Atlantic.
By the moment it reaches the Caribbean nation, it is predicted to have reduced to a category three storm.
While it is difficult to link particular meteorological occurrences to climate change, researchers say it is resulting in climate patterns more common and more extreme.
Warmer oceans generate greater water vapor in the environment, helping fuel the development of tropical cyclones.
Ahead of the beginning of the current Atlantic storm period, meteorological authorities projected above-normal activity, referencing warmer seas and potential enhanced seasonal rains around West Africa - where hurricanes typically originate.
Elena is a freelance writer and mindfulness coach who loves exploring the power of positive thinking.