Saharan sand causing dry belt across convergence zone
Tropical Disturbance eight is now centred around 320 miles east of Trinidad, westbound at 15 knots. This has been chaperoned for its entire crossing by a dry band of Saharan sand which inhibits surface development. In addition, there is a stationary upper-level low north of the Lesser Antilles which is producing wind shear over the system and will put paid to any vertical development. Showers, thunderstorms and we can assume, the odd bit of sand, are likely across the Windward Islands and northern Venezuela over the next 36 hours as this enters the Caribbean.