An east-southeasterly wind-flow around the southern edge of the Atlantic High Pressure System resulted in showers mainly across the Grenadines this morning. As upper levels remain relatively dry, a subsident pattern continues to inhibit deep convective shower activity.
A frontal boundary off the continental US coast continues eastward across the Atlantic waters, to position north of the island chain by late Thursday and Friday. This feature could weaken the High Pressure System, allowing few shallow showers across the islands. Friday into Saturday a weak surface to low level trough system is expected to approach the area. The upper levels are expected to remain relatively dry, but low-mid level moisture convergence behind the trough axis late Saturday and weak upper level divergence could result in scattered showers.
Moderate (20-28km/h) breeze from east southeast could become occasionally gentle (12-19km/h) early Thursday and Friday.
Slight to moderate seas across our islands should prevail for the next few days. Fairly good visibility should gradually decrease due to dust concentrations across the area late Wednesday and Thursday. More significant dust mass is expected to reduce visibility across the area by Sunday.
NOTE: In the Atlantic Ocean.... Showers and thunderstorms have not become any better organized today in association with a broad area of low pressure located about 250 miles south-southwest of the Azores. This system still has a medium (40%) chance of becoming a subtropical cyclone during the next couple days before upper-level winds become unfavorable.
This low is expected to produce winds to near gale force during the next day or two while it moves slowly northeastward (away from Eastern Caribbean).