The Atlantic high pressure system will continue to be the dominant feature across Saint Vincent and the Grenadines over the next 12 hours. After which, moisture from the south east as the Inter-Tropical Convergence Zone (ITCZ) shifts northwards and the approach of the next tropical wave late Thursday into Friday will result in a few scattered showers across the islands.
A noticeable decrease in wind speeds from tomorrow is also likely due to the unstable conditions within the vicinity. The layer of Saharan dust will also persist but a reduction in intensity is anticipated around Saturday.
Meanwhile, an easterly wave embedded within the ITCZ is currently affecting the southern islands, like Trinidad and Tobago. In addition, model guidance is indicating mid level troughing over the south but this level is rather dry and may not lend much support to instability at lower levels.
Model guidance is indicating most of the significant shower activity from the aforementioned tropical wave to be concentrated over Dominica from Friday evening, with instability lasting into Saturday. By Saturday, the Atlantic Ridge of high pressure should re-establish itself across the island chain.
Generally easterly trades (15km/h – 40km/h) will decrease around Thursday (15km/h – 30km/h). Consequently, moderate sea conditions should become slight on both the east and west coast from Thursday afternoon.