An updated bulletin issued by the Met Office now forecasts that Tropical Storm conditions can be felt as early as 9 pm.
The Met Office had previously indicated in its 6 am forecast that the Tropical Storm effects could be felt in some 18 hours, that is, at midnight.
However, in a subsequent bulletin issued at 9 am, the Met Office revised that time to "within 12-18 hours", or, around 9pm.
The following is the Met Office's latest bulletin.
"Tropical Storm Warning remains in effect for Trinidad and Tobago, Grenada and its Dependencies.
The Met Office says the weather system south-east of Trinidad and Tobago now has a 70% chance of developing into a tropical cyclone in 3-4 days.
The Met Office notes, however, that Trinidad and Tobago is not under a tropical cyclone watch or warning at this time.
The following is the latest bulletin from the Met Office.
"At 8.00 a.m. today, Saturday 17th June, 2017, a broad area of disturbed weather, was located approximately 2560 km east-southeast of Trinidad and Tobago.
Over the last 24 hours, this area of disturbed weather has become better organized.