The Met Office has issued a Hazardous Seas Alert from 2pm today to 2pm Saturday.
The alert level has been raised to yellow.
The Met Office says moderate to strong low-level winds are expected to affect sea conditions with waves of 2.5m to 3.0m and occasionally higher.
Tobago is expected to experience these conditions, and to a lesser extent, eastern Trinidad.
The Met Office is instructing sea bathers, fishermen and small craft operators to carefully monitor sea conditions, exercise caution in coastal and offshore waters and be alert for large waves and dangerous currents.
It advises that persons should follow the instructions of lifeguards and monitor official news sources.
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