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 National Hurricane Center has continued to increase the formation chances of the disturbance that is dumping rain over the central Caribbean Sea near Jamaica. The system now has a 90% chance of formation through the next 48 hours.