A case study is presented of the environmental background for a massive Saudi Arabian dust storm event that took place on 10 and 11 March 2009. The dust storm was large enough to be clearly seen from outer space and caused a widespread heavy atmospheric dust load, very low visibility, total airport shutdown, and damage to vehicles and trees across northern and central parts of Saudi Arabia. The precursor and supportive environment for this dust storm outbreak are investigated, drawing upon routine synoptic data and satellite imagery. Analytical evidence is offered to suggest that this dust storm was triggered and sustained by a cold front passage coincident with the propagation of a preexisting intense upperlevel jet streak. The major plume of the 10 March 2009 dust storm originated from several rich dust source areas extending across two regions—the Qasim region and the Adibdibah and As-Summan Plateau region. The intensity and frequency of dust storms triggered from these active areas of dust emissions seem to be dominated by a response to the amount of precipitation during November and December.
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