Tropical Storm Erin is expected to strengthen into a hurricane within the next 24 hours as it approaches the Leeward Islands, forecasters say.

At 08:15 local time on Thursday, the storm’s centre was located about 904 miles (1,455km) east of the Leeward Islands, moving west at 17mph (27km/h). Maximum sustained winds were near 50mph, with higher gusts, and storm-force winds extended up to 60 miles from the centre.

Meteorologists say Erin could reach hurricane strength by Friday, before passing dangerously close to the Leeward Islands late Friday night into Saturday. A southward shift in its track could bring it even nearer to the islands.

While no warnings are currently in effect, a Tropical Storm Watch may be issued for parts of the Leeward Islands and the British Virgin Islands later today. The probability of tropical storm-force winds is up to 45% for Anguilla and some parts of the BVI.

Forecasters warn of building swells, rough seas, heavy rain, and gusty winds. Residents are urged to stay alert and follow official updates from the Antigua and Barbuda Meteorological Service.

The next advisory is expected at 11:00 local time, or sooner if conditions change.