Sand storm – sandstorm – long covered with dark aura. No wonder they wear the name – "sandstorm" means poisonous, poisoned. And these storms really ruined the whole caravans.
Samum observed in the deserts of North Africa and the Arabian Peninsula and most of Western and South-Western direction. Mainly happens in spring and summer.
"For an hour or half an hour before the rise merciless storm, bright sun fades, clouded murky veil. On the horizon appears a little dark cloud. It increases rapidly, closing the blue sky. Here came the first fierce gust of hot, prickly wind. And a minute later pales day. The clouds of burning sand mercilessly flogged all living things, closed the midday sun. The howling and whistling of the wind disappear all other sounds. It seems that the air itself turns against you..." - this Is the description of sandstorms, the ancient Greek historian Herodotus
Fine sandy dust, which raises the strong wind, penetrates the ears, eyes, nose, throat, lungs
A storm of deserts owe their birth passing cyclones that offend, and deserts. There is another reason - in the deserts in the hot season reduced atmospheric pressure. The hot Sands of the strongly heated air near the earth's surface. As a result, he rises, and rushes with very large velocity flows over the cold dense air. Formed a small local cyclones, give rise to sandstorms.
