Tropical Storm Isaacs weakened significantly overnight Wednesday as it nears the Leeward Islands.

At 5 a.m. Thursday, the cyclone was centered near latitude 15.4° North; longitude 59.7 degrees West or about 170 miles (275 km) east northeast of St. Vincent and the Grenadines.

Maximum sustained winds have decreased to near 45 mph (75 km/h) with higher gusts. Gradual weakening is forecast during the next 72 hours.

Tropical-storm-force winds extend outwards up to 160 miles (260) km, primarily to the north of the centre.

Isaac is moving westward at 17 mph (28 km/h).

On the current forecast track, the centre of this system is forecast to pass near Dominica, or approximately 150 miles (240 km) north of mainland St. Vincent some time today, Thursday.

Some pockets of light to moderate showers, and possible isolated thunderstorms are likely into Friday, with rainfall accumulations of 25 to 50 mm (1 to 2 inches) now possible.

Sea conditions are expected to moderate to rough in open waters with swells peaking from 2.0 to 3.0 meters (7 to 10 feet).

A small-craft warning is in effect. Small-craft operators and sea bathers are strongly advised to exercise caution.

The SVG Meteorological Services says it will continue to monitor the passage of the storm but noted that there are no there are no watches or warnings in effect for SVG.