Last Sunday Afternoon 4.30pm: Denver Airport BLOCKED by DUSTSTORM!!!! [AirClips]

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METAR from that time KDEN 242241Z 34047G64KT 6SM TS BLDU SQ FEW090CB BKN130 BKN220
31/12 A3010 RMK AO2 PK WND 34064/2240 WSHFT 2227 TSB33 CONS
LTGICCG VC N TS VC N MOV E T03110122 $= (SPECI)

A dust storm is a meteorological phenomenon common in arid and semi-arid regions. Dust storms arise when a gust front or other strong wind blows loose sand and dirt from a dry surface. Particles are transported by saltation and suspension, a process that moves soil from one place and deposits it in another.

Drylands around North Africa and the Arabian peninsula are the main terrestrial sources of airborne dust. Also with some contributions from Iran, Pakistan and India into the Arabian Sea, and China's significant storms deposit dust in the Pacific. It has been argued that recently, poor management of the Earth's drylands, such as neglecting the fallow system, are increasing dust storms size and frequency from desert margins and changing both the local and global climate, and also impacting local economies.

The term sandstorm is used most often in the context of desert sandstorms, especially in the Sahara Desert, or places where sand is a more prevalent soil type than dirt or rock, when, in addition to fine particles obscuring visibility, a considerable amount of larger sand particles are blown closer to the surface. The term dust storm is more likely to be used when finer particles are blown long distances, especially when the dust storm affects urban areas.