the warm dry and dusty air mass that is formed over the sahara desert is known as sandstorm.
the warm dry and dusty air mass that is formed over the sahara desert is known as?
sandstorm
precipitation in the sahara desert is scarce, as the whole desert generally receives less than of rain per year except on the northernmost and southernmost edge as well as in the highest desert mountains. more than half of the desert area is hyper-arid and virtually rainless, with an average annual precipitation below and many consecutive years may pass without any rainfall. the south of the sahara desert, along the boundary with the hot semi-arid climate ("bsh") of the sahel, receives most of its annual rainfall during the highest-sun months (summer) when the inter-tropical convergence zone moves up from the south. wind- and sandstorms occur in early spring. local inhabitants protect themselves from the heat, the sunshine, the dry air, the high diurnal temperature ranges and the sometimes dusty or sandy winds by covering their heads, such as the cheche garment worn by tuareg.
sahara desert (ecoregion)
each air mass type brings in different temperature and moisture properties. the continental polar air mass brings in cold and dry air from central canada, traveling south across the region. the continental tropical air mass comes in from the gulf of mexico and the caribbean, bringing in hot and dry air while moving north. the maritime tropical air mass comes from the southwest united states and northern mexico, and it tends to bring in warm and moist air, but sometimes the air that comes in is dry. the last air mass that affects this ecoregion is the maritime polar air mass. it comes in from the pacific ocean and moves east over the mountain regions. it brings in cool moist air that changes to warm dry air after moving over the mountains. these air masses cause the seasons to be very extreme and drastic. the winter time brings harsh and varied weather. the midsummer months bring in warm moist and dry air, depending on the area within the region and what air masses affect those areas.
great plains ecoregion