Ripples on the wind have created the intricate wave patterns seen in this thick plume of dust over Egypt (right) and Libya (left). The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua satellite captured this image on February 28, 2005, just as a strong gust of wind pulled a streamer of dust out over the Mediterranean Sea. This dust storm started on February 28, and continued through at least March 2.
NASA image courtesy Jeff Schmaltz, MODIS Land Rapid Response Team at NASA GSFC. The image is available in additional resolutions.