A high surf advisory is in effect for Antigua, Barbuda, Anguilla and the British Virgin Islands as moderate long-period swells move into the area, creating hazardous conditions along northern and eastern coastlines.

The advisory takes effect from Sunday evening into Tuesday, depending on the island, and is expected to bring seas of 6 to 10 feet, with swells occasionally reaching 12 feet.

Forecasters say breaking waves could rise over 6 feet, generating dangerous rip currents and posing threats to swimmers, beachgoers and marine activities.

According to the Antigua and Barbuda Meteorological Service, the swells will mainly affect reefs and exposed northern coastlines where shallow, gently sloping nearshore areas make conditions more severe. High tides, combined with wind and swell action, could also lead to localized flooding and beach erosion.

The potential impacts include strong currents capable of sweeping even experienced swimmers out to sea, injuries to beachgoers, damage to coral reefs, disruptions to marine businesses, and saltwater intrusion into potable water systems. Authorities warn that high surfs can also knock spectators from rocks, jetties and piers.

Beachgoers are urged to exercise extreme caution, stay on sheltered southern beaches where possible, and avoid rocky northern coastlines.

Swimmers caught in a rip current are advised to float, avoid fighting the current, swim parallel to shore to escape, and signal for help if necessary.

Forecaster Letitia Humphreys noted that the threat level is moderate but carries the potential for significant impacts.