Harmattan n. : A dry, hot wind, prevailing on the Atlantic coast of Africa, in December, January, and February, blowing from the interior or Sahara. It is usually accompanied by a haze which obscures the sun.

Example:
Is Western Sahara in danger of extended Harmattan?

Taxonomy
Harmattan, free encyclopedia, wind, blows, haze, dust, sand, interaction, fine dust, dust particles, West Africa, dust in the air, search, dry and dusty, the Gulf, passage, desert, visibility.

Defination from the web:
... the dust and sand stirred by these winds is known as the Harmattan haze, and costs airlines millions of dollars in cancelled and diverted flights ... "Harmattan". Encyclopædia Britannica (11th ed.). 1911. This climatology/meteorology-related article is a stub. You can help ...