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A haboob ((アラビア語:هَبوب) ''habūb'' "blasting/drafting") is a type of intense dust storm carried on an atmospheric gravity current, also known as a Weather Front. Haboobs occur regularly in arid regions throughout the world. They have been observed in the Sahara desert (typically Sudan, where they were named and described), as well as across the Arabian Peninsula, throughout Kuwait, and in the most arid regions of Iraq. African haboobs result from the northward summer shift of the inter-tropical front into North Africa, bringing moisture from the Gulf of Guinea. Haboob winds in the Arabian Peninsula, Iraq, Kuwait, and North America are frequently created by the collapse of a thunderstorm, while haboobs in Australia may be frequently associated with cold fronts. The deserts of Central Australia, especially near Alice Springs, are particularly prone to haboobs, with sand and debris reaching several kilometers into the sky and leaving up to of sand in the haboob's path. The arid and semiarid regions of North America—in fact, any dry region—may experience haboobs. In North America, the most common terms for these events is either dust storm or sandstorm. In the U.S., they frequently occur in the deserts of Arizona, including around the cities of Yuma and Phoenix; in New Mexico, including Albuquerque; and in Texas. During thunderstorm formation, winds move in a direction opposite to the storm's travel, and they move from all directions into the thunderstorm. When the storm collapses and begins to release precipitation, wind directions reverse, gusting outward from the storm and generally gusting the strongest in the direction of the storm's travel. When this downdraft of cold air, or ''downburst'', reaches the ground, it blows dry, loose silt and clay (collectively, dust) up from the desert, creating a wall of sediment that precedes the storm cloud. This wall of dust can be up to wide and several kilometers in elevation. At their strongest, haboob winds often travel at , and they may approach with little or no warning. Often rain does not appear at ground level as it evaporates in the hot, dry air (a phenomenon known as virga). The evaporation cools the rushing air even further and accelerates it. Occasionally, when the rain does persist, it can contain a considerable quantity of dust. Severe cases are called ''mud storms''. Eye and respiratory system protection are advisable for anyone who must be outside during a haboob. Moving to shelter is highly advised during a strong event. File:Abqoob.JPG|A haboob heads into Albuquerque, summer 2013. File:United Nations Dash 8 Haboob Sudan UA-320-1.jpg|A haboob closes in on Nyala Airport File:DustStormInSpearmanTexas19350414.jpg|Dust Bowl era haboob approaching Spearman, Texas, on 14 April 1935. File:Haboob2.jpg|Haboob blowing into Ahwatukee, Phoenix, Arizona, on 22 August 2003. File:Sandstorm.jpg|A massive haboob is close to enveloping Al Asad Airbase, Iraq, just before nightfall on 27 April 2005. File:Haboob, Taji, Iraq, 2006.JPG|A haboob approaches Taji, Iraq, in 2006. File:KSM 1066a.JPG|A haboob hits the South-East Valley, Gilbert, AZ, USA, on 5 July 2011, around 7 p.m., hiding San Tan Mountain completely. File:2013-07-04 19 50 47 Dust storm (haboob) on U.S. Route 30 in Twin Falls in Idaho.jpg|Dust storm (haboob) on US 30 in Twin Falls, Idaho on July 4, 2013. File:2013-07-04 19 52 40 Dust storm (haboob) along U.S. Route 30 just west of Twin Falls in Idaho.jpg|Dust storm (haboob) on west side of Twin Falls, Idaho on July 4, 2013. ==See also== *Bora (wind) *Dry thunderstorm *Dust devil *Dust storm *Intertropical Convergence Zone *Khamsin *Mistral (wind) *Outflow boundary *Simoom *Sirocco 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Haboob」の詳細全文を読む スポンサード リンク
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