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Kármán Vortex Streets Trailing Off Cape Verde and Canary Islands – June 20th, 2013

21.8N 18.5W

June 20th, 2013 Category: Clouds, Image of the day VIIRSSuomi-NPP

West Africa – June 19th, 2013

West of Western Sahara, Mauritania and Senegal, off the coast of West Africa, is an atmospheric phenomenon known as Kármán Vortex Streets. These parallel rows of oppositely spinning vortices, caused by the unsteady separation of flow of a fluid around blunt bodies, can be seen trailing off the Canary Islands (above) and off the Cape Verde islands (below). Some dust can also be seen spreading off the coast of Mauritania.

Dust Blowing Over Cape Verde Islands – June 1st, 2013

16.0N 23W

June 1st, 2013 Category: Dust Storms, Image of the day

West Africa – June 1st, 2013

A plume of dust spreads westward, off the coast of West Africa by the Mauritania-Senegal border (marked by the Senegal River, right center). The plume extends west-southwestward, blowing far over the Cape Verde Islands.

Dust Over Cape Verde Archipelago

17.2N 16.5W

May 22nd, 2013 Category: Dust Storms

West Africa – May 22nd, 2013

A veil of dust blows off the coast of West Africa and towards the islands of the Cape Verde archipelago (lower left quadrant). Along the coast, the dust hangs over the Bay of Arguin (above), in Mauritania, and the mouth of the Senegal River (below), in Senegal.

Dust Near Cape Verde Islands – February 4th, 2013

11.9N 15W

February 4th, 2013 Category: Dust Storms, Image of the day

West Africa – February 2nd, 2013

Dust from the Sahara Desert blows off the coast of Mauritania, Senegal, the Gambia and Guinea Bissau (top to bottom, right side of image), towards the Cape Verde islands (upper left quadrant). As the dust appears thickest offshore, the Senegal River (upper right, forming the border between Senegal and Mauritania), the Gambia River (center of coastline) and the Geba River (lower part of coastline, marked by a wide, sediment-filled estuary) can be observed.

Dust Over Bay of Arguin, Mauritania, and Cape Verde Islands

18.2N 17.3W

January 10th, 2013 Category: Dust Storms

Mauritania – January 6th, 2013

Sahara Desert dust blows off the coast of West Africa. It appears thickest over and near the Bay of Arguin, in Mauritania. Although the image shows the dust only reaching as far as the Cape Verde Islands (lower left quadrant), such clouds of dust are often carried across the Atlantic Ocean by the Trade Winds and tend to reach the Caribbean about a week later, where they may persist in the air for months. Over the northern hemisphere summer, African dust may be carried into higher latitudes and cover large areas of the Gulf of Mexico and the southern and eastern USA. The presence of high concentrations of dust for such long periods of time raises concerns about the impact on human health (click here for more information).

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