Jewett C. Gilson, Wealth of the World's Waste Places and Oceania
“ Perhaps the full blast of the simoom may last an hour—perhaps two or even three hours. In lighter strain it may continue a whole day. When, finally, it ceases the air is thick with fine dust; one can see scarcely a rod away. Sun and sky are hidden, and the blackness of a tornado or of a London fog prevails. The fine dust floating in the air may not settle for several days. Perhaps a week afterward there may be a haze that partly obscures the sun. The dust, finer than the finest flour, pervades everything in the desert. One's clothing is full of it; one's hair becomes harsh and matted ”
