Dust Storm in Northern Chad – October 22nd, 2008
Here we have a sharp image of a dust storm blowing over the northern third of Chad and parts of southern Libya, around the Emi Koussa volcano in the Tibesti Mountains.
Variations in local rainfall have created three major geographical zones in Chad: the North is a desert zone, the center is an arid Sahelian belt, and the South is a more fertile savannah zone.
The Sahara lies in the country’s northern third, the part of the country visible in the image. Yearly precipitation there is under 50 mm (2 in). In fact, Borkou, Chad (in the image, east of the mountains) is the most arid area of the Sahara. Vegetation in this region is scarce; only the occasional spontaneous palm grove survives, the only ones to do so south of the Tropic of Cancer.
In the image, we can see an interesting contrast in sand color. In the upper part, the sands streaming across the Libyan border into Chad are more yellow-red in color. In the area around Borkou, the colors mix, before giving way to the very white sand South of the mountains.