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Dust and Kármán Vortices by Canary Islands – June 23rd, 2013

21.0N 19.1W

June 23rd, 2013 Category: Clouds, Dust Storms, Image of the day VIIRSSuomi-NPP

West Africa – June 22nd, 2013

Named after the engineer and fluid dynamicist Theodore von Kármán, in fluid dynamics, a Kármán vortex street is a repeating pattern of swirling vortices that are created when the flow of a fluid separates unsteadily as it moves around blunt bodies. Here, this phenomenon can be seen in the upper left quadrant, as spiralled cloud patterns southwest of the Canary Islands. In the lower left quadrant, dust can be seen blowing off the coasts of Mauritania and Senegal.

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.

Vortex Streets by Canary Islands and Dust Off Mauritania

26.8N 17W

April 18th, 2013 Category: Clouds, Dust Storms

Mauritania – April 17th, 2013

The interesting paisley swirled cloud patterns southwest of the Canary Islands are Kármán vortex streets. In fluid dynamics, these are repeating patterns of swirling vortices caused by the unsteady separation of flow of a fluid around blunt bodies – in this case, the islands of the archipelago. Visible in the lower part of the image is the Bay of Arguin, in Mauritania, and a light veil of dust blowing off the coast.

Dust South of Fuerteventura, Canary Islands

28.3N 14W

December 31st, 2012 Category: Dust Storms

Canary Islands – December 28th, 2012

Dust blows off the coast of Western Sahara and to the northwest, towards the Canary Islands. Although thick plumes have not reached the islands, one can be seen just south of Fuerteventura (right edge). The archipelago is usually affected by large dust storms several times per yer that may last up to a week.

Dust Over Wad Ad-Dahabnota Peninsula and Near Canary Islands – December 30th, 2012

23.6N 15.9W

December 30th, 2012 Category: Dust Storms, Image of the day

Canary Islands – December 28th, 2012

Dust blows off the coast of Western Sahara and towards the northwest, over the Atlantic Ocean. Visible through the dust is the Wad Ad-Dahabnota Peninsula, also known as the Villa Cisneros Peninsula while the region was under Spanish colonial rule. The Canary Islands can be seen near the top edge of the image, although the dust does not reach them.