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.

A disturbance swirling over the Caribbean Sea has now been designated as Potential Tropical Cyclone Nineteen on Wednesday, and forecasters say the system will eventually likely strengthen into Tropical Storm Sara in the coming days.

The National Hurricane Center is tracking a disturbance in the Atlantic Ocean with a 90% chance of strengthening into a serious storm over the next week.