August 11, 2013 - Dust storm in the Sahara Desert and over the Atlantic Ocean

Dust storm in the Sahara Desert and over the Atlantic Ocean

A late July, 2013 Saharan dust storm continued through the end of the month, as strong winds blew dust high aloft and thousands of kilometers over western Africa and across the tropical Atlantic Ocean. The Moderate Resolution Imaging Spectroradiometer (MODIS) flying aboard NASA’s Terra satellite passed over the region on July 31 and captured this true-color image of the massive event.

Broad swirls of dust can be seen blowing westward over the arid land, crossing parts of Algeria (upper right), Western Sahara (northeast coast) and most of Mauritania (center), Mali (southeast), and, on the southern coast, Senegal, the Gambia and Guinea-Bissau. The Cape Verde Islands, a group of 10 islands located in the Atlantic Ocean about 350 miles (570 km) west of southern Mauritania, have been completely obscured by an extremely thick wave of deep tan dust.

This image was created as a mosaic of several MODIS swaths, combining them to create a broad view across both land and sea. However, the size of the dust storm exceeds the bounds of this image, and extends both to the east and to the west. The storm is so large that dust was predicted to reach North America in early August. June and July are the peak months for dust storms in the southwest Sahara, and this storm, though large, is typical for this time of year.

The dust is traveling over the Atlantic Ocean during peak hurricane season, and experts say that the dust, as well as the extremely dry Saharan air accompanying it, is likely to suppress the formation of tropical systems during early August. On August 10, the National Hurricane Center issued a discussion on a Tropical Wave forming off the coast of West Africa. The wave is sitting on the leading edge of the Saharan Dust, and it is reported that the dust is currently inhibiting the formation of deep convection, so only a few showers are present on the northern extent of the wave axis.

Image Facts
Satellite: Terra
Date Acquired: 7/30/2013
Resolutions: 1km ( B), 500m ( B), 250m ( B)
Bands Used: 1,4,3
Image Credit: Jeff Schmaltz, MODIS Land Rapid Response Team, NASA GSFC