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Search Results for "dust west africa february 2012":

Dust Over Ivory Coast and Ghana

4.2N 2.1W

February 11th, 2012 Category: Dust Storms

Dust Over Ghana and Ivory Coast - February 10th, 2012

An intense dust storm has been clouding the skies over West Africa over the last few days (click here for previous images). At the beginning of the month, the dust was concentrated over Mauritania and Senegal, then moved eastward over the Cape Verde Islands.

A few days later, shifting winds carried the Saharan sands southward over the Ivory Coast and Ghana, whose skies it has been clouding over the last three or four days. The coastline of these countries along the Gulf of Guinea is barely visible through the thick cloud of dust.

Cloud of Dust from Western Africa Over Atlantic Ocean

9.5N 17.8W

February 10th, 2012 Category: Dust Storms

Dust Over Cape Verde - February 7th, 2012

An extremely thick cloud of dust from the Sahara Desert can be seen blowing off the coast of Ivory Coast and Ghana in West Africa and over the Atlantic Ocean in this image, completely obscuring everything below. The dust has been affecting much of the coastline of West Africa, Mauritania and Senegal over the last few days. Click here for an image of dust from the same storm blowing over the Cape Verde Islands.

A dust storm (also known as a sand storm) is a meteorological phenomenon common in arid and semi-arid regions. Dust storms arise when a gust front or other strong wind blows loose sand and dirt from a dry surface. Particles are transported by saltation and suspension, causing soil to move from one place and deposition in another. The Sahara and drylands around the Arabian peninsula are the main terrestrial sources of airborne dust.

Thick Dust Blowing Over Cape Verde Islands – February 9th, 2012

16.0N 24W

February 9th, 2012 Category: Dust Storms, Image of the day

Dust Over Cape Verde - February 7th, 2012

Dust from the Sahara Desert blows off the west coast of Africa and over the Cape Verde Islands. The dust is so thick that it obscures several of the islands, although some interesting cloud patterns are visible through the veil of dust as it thins out.

These patterns are cloud vortex streets, also known as von Karman vortices. They are roughly symmetrical patterns of swirls created by low-level winds rushing over the 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.