Hurricane the storm is forecast to become a uncommon Category 5 cyclone as it turns towards the Caribbean island, bringing dangerous sudden floods and mudslides.
The cyclone, which registered wind speeds of up to 195 km/h as of 06:00 GMT, is now shifting north-west in the Caribbean region and is anticipated to make landfall by midweek, according to meteorological authorities.
Alerts of power cuts and structural damage have been announced as this storm produces up to 76cm of rain and storm surges as high as 4m above ground. "Seek shelter now," inhabitants have been urged.
Melissa is the thirteenth storm in this year's Atlantic season, which usually concludes in late autumn.
A category five storm is the most intense classification, with wind speeds of at least 252 km/h.
Even though Melissa is expected to reduce in intensity to a fourth-level storm before reaching Jamaica, meteorologists said there was "minimal real distinction in the total effects" upon landfall, and that the storm will be "just as powerful" when it strikes the country.
With tropical storm-strength wind and rainfall anticipated well in advance long before it passes over the island's interior - perhaps encompassing the national capital - alerts indicate that "readiness efforts must be accelerated".
"An extended timeframe of harmful winds and intense precipitation has started and will cause severe and deadly flash flooding and numerous landslides," counseled meteorological officials.
Jamaican Prime Minister Andrew Holness said: "I realize that there are countless citizens who are worried, who are extremely apprehensive, and with good reason: concern is justified.
"Yet the optimal approach to handle nervousness and any unease and concern is to stay ready."
Locals are being advised to secure their homes with protective bags and plywood sheets, and to stock up on essentials.
Warnings are also ongoing for regions of the neighboring country such as the primary urban center, the Dominican Republic and eastern Cuba, where the hurricane is projected to bring comparable impacts by the middle of next week.
Landslides already being caused by the storm have already killed two in the country, according to local authorities.
This weather system is projected to pass over Cuba by midweek before traveling via the Antillas Mayores and emerging into the open ocean.
By the point it makes contact with Cuba, it is predicted to have diminished to a Category 3 hurricane.
Although it is difficult to connect particular meteorological occurrences to global warming, researchers say it is resulting in meteorological events more prevalent and more extreme.
Higher ocean heat create additional humidity in the atmosphere, contributing to the formation of tropical cyclones.
Before the commencement of this year's Atlantic hurricane season, weather organizations predicted increased storm frequency, referencing warmer seas and possible enhanced seasonal rains around West Africa - where Atlantic storms frequently develop.
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Robert Williams
Robert Williams
Robert Williams
Robert Williams
Robert Williams