Meteorologists have been tracking the storm for the past week, with its chances of forming increasing gradually. Tropical Storm Sara is expected to form by Thursday morning, becoming a hurricane by Friday night and a major hurricane by Saturday night, AccuWeather said.

The cluster of showers and thunderstorms over the Caribbean that the National Hurricane Center has named Invest 99L has a strong chance of developing into Sara, the next major hurricane of the season by Friday as it moves over the central Caribbean Sea,

A tropical disturbance building in the Caribbean Sea has been designated as Potential Tropical Cyclone 19 by the National Hurricane Center, and is forecast to strengthen into a tropical storm – known as Tropical Storm Sara – over the next few days.