The St. Vincent and the Grenadines Meteorological Services said 8 p.m. Saturday that it continues to a strong tropical wave located 500 miles (805 km) to the east of the Windward Islands.
Showers and thunderstorms have increased and are beginning to show signs of organisation,” meteorological forecaster Gregory Cato said in the bulletin.
This system could become a tropical depression during the next day or two while it moves quickly westward at about 20 to 25 mph, passing through the Windward and Leeward Islands late Sunday.
Current model guidance suggests that there is a medium chance (40%) of development during the next seven days.
“Regardless of development, this system is likely to generate cloudy skies and trigger moderate to heavy showers and thunderstorms across St Vincent and the Grenadines by late Sunday,” the forecast said.
“In addition, strong wind speeds ahead of this system are also forecast, which would result in deteriorating sea conditions.”
The system is expected to reach the central Caribbean on Tuesday, where conditions are expected to become less favourable for additional development.
A US Air Force reconnaissance aircraft is scheduled to investigate the systemon Sunday, if necessary.
Flash flood watches or warnings may be issued for St. Vincent and the Grenadines within the next 24 hours, Cato said, and urged residents of the country to keep informed on the progress of this system.