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Around this time every year a huge plume of dust and sand makes its way from the Sahara Desert to the Americas. Also known as the ‘Saharan Air Layer’, high pressure in the Atlantic provokes a clockwise flow of air which picks up and carries the dust all the way through the Caribbean.
On Thursday the most westerly edge of the dust cloud reached parts of the Caribbean after covering the Atlantic in a short time period, thanks to strong winds in the region.

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