A strong tropical wave with an accompanying area of low pressure along the wave axis near 10°N 48°W, has some potential for further development as the system approaches the Southern Windward Islands late Saturday/early Sunday.
Regardless of development, brisk surface winds of 45 to 55km/h or 28 to 34 mph (25 to 30 kt) with higher gusts and pockets of moderate to heavy showers with rainfall accumulations of 100 to 150mm (4 to 6 inches) are possible during the passage of this system.
In addition, deterioration in sea-conditions is also expected; with east-southeasterly swells of 3.0 to 4.5m (10 to 15ft) are likely. Thus, a High-Surf Advisory and Small-Craft Warning will be in effect from 6:00 pm tomorrow, Saturday 21st September until 12:00 noon Monday 23rd September, 2019.
A High-Surf Advisory is issued when breaking wave action poses a threat to life and property within the surf zone.
A Small-Craft Warning means in this case, that wind-speeds of 45 to 55km/h (25 to 30 kt) and /or seas greater than 3m (10ft) will be affecting the marine area.