The St. Vincent and the Grenadines (SVG) Meteorological Services on Tuesday said it is monitoring an area of instability associated with a dissipating frontal boundary.

“This activity, which has been affecting the Leeward and northern Windward Islands over the past 24 hours, is expected to move southward across our area by tomorrow and persist to the end of the week,” forecasters say.

As a result, a gradual increase in shower activity and possible isolated thunderstorms are likely across St. Vincent and the Grenadines.

This activity is likely to peak in intensity on Thursday as the mid to upper atmosphere become more favourable for enhancement.

The current model projected rainfall accumulations are approximately 2 inches or up to 50 mm, with higher amounts in mountainous areas.

Residents and motorist are being advised to be vigilant and exercise caution during the passage of this system.

Additionally, moderate to rough northerly swells are expected during the next 24 hours, peaking near 13 feet. A high-surf advisory and a small craft warning are in effect for above normal seas. Small craft operators and sea bathers are advised to exercise caution

The St. Vincent and the Grenadines Meteorological Services will continue to monitor the situation and if necessary, provided updates.

Meanwhile, the Met Services said Tuesday that the weather system northerly swells of 3 to 4 metres (10 to 13 feet) will start to affect the coastal waters around SVG, particularly on the north and eastern coastlines.

This activity is expected to persist for at least another 24 hours and may become even more adverse at times of high tide.

As a consequence, a high-surf advisory and small-craft warning came into effect for SVG at 6 p.m. Tuesday and will continue for 24 hours.

“Large waves and dangerous rip currents can be expected mainly along the west, north, and east coasts of
St. Vincent and the Grenadines, which will create unsafe conditions for small-craft operators. Sea-bathers and other users of the sea are also advised to stay out of the water,” the Met Services said.

In this case, a small-craft warning  means that wind speeds of 25 to 33 knots (47 t0 62 km/h) and/or seas equal to or greater than 3m (10ft) will be affecting the marine area.

A high-surf advisory is issued when breaking wave action poses a threat to life and property within the surf zone.

This advisory and warning will be in effect until 6 p.m. Wednesday.