A dust storm blew out of Egypt and over the Mediterranean Sea on Jan. 29, 2011.
NASA's Aqua satellite captured this image of the storm over the blue of the sea. Spanning hundreds of kilometers, the dust plume extends from Egypt across the Mediterranean Sea , dissipating off the coast of Lebanon.
On its journey from Egypt's interior, the dust passes over Cairo and the Nile Delta. Source points for the plume aren't apparent in this image, but the dust may have originated in Egypt's Western Desert.