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Posts tagged Kármán Vortex streets

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.

Salton Sea and von Kármán Vortex Street by Baja California, Mexico and USA

27.6N 110.8W

November 26th, 2012 Category: Clouds, Lakes

USA and Mexico – November 25th, 2012

Visible near the top edge of this image, in the upper left quadrant, is the Salton Sea, a large lake in southern California, USA. Continuing south through the green Imperial Valley, one comes to the mouth of the Colorado River in the Gulf of California (Sea of Cortez), by the start of the Baja California Peninsula.

West of the peninsula, in the lower left quadrant, a von Kármán Vortex Street can be seen in the clouds over the Pacific Ocean. The “street” is a repeating pattern of swirling vortices caused by the unsteady separation of flow of a fluid over bluff bodies – in this case, islands.

Cloud Streets Behind Cape Verde Islands – January 30th, 2012

16.0N 24W

January 30th, 2012 Category: Clouds, Image of the day

Cape Verde - January 19th, 2012

The roughly symmetrical patterns of swirls and curves in the clouds in this image are cloud vortex streets, also known as von Karman vortices. They were created by low-level winds rushing over the Cape Verde Islands off the coast of northwestern Africa.

Von Karman vortices form nearly everywhere that fluid flow is disturbed by an object. In this image, the “object” that is disturbing the fluid flow is the group of Cape Verde islands. As a prevailing wind encounters the island, the disturbance in the flow propagates downstream of the island in the form of a double row of vortices which alternate their direction of rotation.

Kármán Vortex Streets and Dust South of Canary Islands – August 18th, 2011

28.2N 16.6W

August 18th, 2011 Category: Clouds, Dust Storms, Image of the day

Dust Near Canary Islands - August 14th, 2011

Dust blows off the west coast of Africa, by Morocco, Western Sahara and Mauritania, and over the Canary Islands (top center), creating a golden veil offshore.

Visible through this veil are some clouds arranged in rows of swirls. These interesting patterns are Kármán Vortex Streets, double rows of spiralling vortices created by the unsteady separation of flow water vapor over the islands.