This report provides an update on Tropical Cyclone Isaac and its impact on CCRIF territories in the Central Caribbean. After impacting the Eastern Caribbean on 22 August and affecting Dominica (as reported in the earlier CCRIF briefing), Tropical Storm Isaac entered the Caribbean Sea. At 1500 UTC on 24 August, Isaac was located 185 miles (300 km) south-southeast of Port-au-Prince, Haiti with maximum sustained winds of 60 mph (95 km/h). It was moving in a west northwesterly direction at a speed of approximately 14 mph (22 km/h) with tropical storm force winds extended outward up to 185 miles (295 km) from the centre of Isaac.