從灘云到超級細(xì)胞云，天空中這些看上去又白又軟的東西并不總是那么潔白和松軟。下面你將看到的云可以稱得上千奇百怪，它們當(dāng)中有很多都代表著災(zāi)難即將到來。
guardian.co.uk, Thursday 23 August 2012 18.51 BST
《衛(wèi)報》2012 年 8 月 23 日周四 18.51 （英國標(biāo)準(zhǔn)時間）
Shelf cloud, Minnesota, US. When seen from the ground shelf clouds appear as low, wedge-shaped clouds and are usually associated with severe thunderstorms
美國明尼蘇達(dá)州的弧狀云。弧狀云剛在地表上出現(xiàn)時看上去像低低的楔形云，通常伴有雷暴。
Photograph: Science Photo Library/Rex Features
圖片：科技圖片庫/雷克斯圖片社
South Dakota, US: Mammatus clouds over South Dakota. Mammatus is a meteorological term applied to a cellular pattern of pouches hanging underneath the base of a cloud
美國南達(dá)科塔州：南達(dá)科塔州上空的乳狀云。乳狀屬于氣象術(shù)語，指的是云層底部垂下的細(xì)胞型囊狀物。
Photograph: Science Photo Library / Rex Feat/Science Photo Library / Rex Feat
圖片：科學(xué)圖片庫/雷克斯圖片社
Cumulonimbus cloud over western Africa, taken from the International Space Station (ISS). Cumulonimbus clouds rise vertically until they hit a natural barrier, known as the tropopause (he atmospheric boundary between the troposphere and the stratosphere), and then flatten out. Cumulonimbus usually herald a severe storm
積雨云：國際空間站 (ISS) 所攝，位于非洲西部上空。積雨云垂直上升，到達(dá)被稱為對流層頂（對流層和平流層之間的大氣邊界層）的天然障礙物，然后開始向四周平鋪擴(kuò)展。積雨云通常預(yù)示著猛烈的暴風(fēng)雨。
Photograph: Science Photo Library/Rex Features
圖片：科學(xué)圖片庫/雷克斯圖片社
Noctilucent clouds are crystals of ice hanging around 50 miles high in the atmosphere that catch the light of the sun long after it has set on the horizon.
夜光云：太陽從地平線升起很長時間后，存在于大氣層中 50 米左右高度的冰晶吸收陽光而形成。
Photograph: Science Photo Library/Rex Features
圖片：科學(xué)圖片庫/雷克斯圖片社
Pileus cloud above the Sarychev volcano as it erupts, at the Kuril Islands, Russia. Pileus clouds are small clouds that form on top of a bigger cloud
俄羅斯千島群島 Sarychev 火山爆發(fā)時出現(xiàn)在火山上空的菌蓋云。菌蓋云是指體積較大的云團(tuán)頂部形成的小云團(tuán)。
Photograph: Science Photo Library / Rex Feat/Science Photo Library / Rex Feat
圖片：科學(xué)圖片庫/雷克斯圖片社
Actinoform clouds are only visible from space. These large formations form ray-like patterns over hundreds of miles. They are associated with drizzle and gloomy weather. Very British, perhaps?
放射形云只能在太空中看到。這些巨大的云團(tuán)呈射線形，覆蓋范圍達(dá)數(shù)百英里。它們一般預(yù)示著小雨和陰天。非常有英國范兒，是吧？
Photograph: Science Photo Library/Rex Features
圖片：科學(xué)圖片庫/雷克斯圖片社
supercell just north of Grand Island, Nebraska, US. Supercell thunderstorms rotate with immense energy, causing a strong updraft and severe weather, including tornadoes, hail, heavy rain, lightning and heavy winds
美國內(nèi)布拉斯加州格蘭島以北出現(xiàn)的超級單體。能量巨大的超級單體雷暴不斷旋轉(zhuǎn)，造成強(qiáng)烈的上升氣流和惡劣天氣，包括龍卷風(fēng)、冰雹、大雨、閃電和大風(fēng)
Photograph: Science Photo Library/Rex Features
圖片：科學(xué)圖片庫/雷克斯圖片社
Lenticular cloud, Mauna Kea, Hawaii. The lens-shaped clouds form at high altitude and are usually formed when air passes over mountain tops
夏威夷莫納克亞的莢狀云。這種眼鏡狀的云在緯度很高的地方形成，而且一般都是出現(xiàn)在空氣經(jīng)過山頂?shù)臅r候。
Photograph: Science Photo Library/Rex Features
圖片：科學(xué)圖片庫/雷克斯圖片社
A steam ring being blown from the Bocca Nuova vent of Mount Etna, Sicily. Steam rings are generated when a pulse of steam is ejected from a near-cylindrical volcanic vent
西西里島埃特納火山 Bocca Nuova 火山口噴出的蒸汽環(huán)。當(dāng)近柱火山口噴射出一股蒸汽時，蒸汽環(huán)就產(chǎn)生了。
Photograph: Science Photo Library/Rex Features
圖片：科學(xué)圖片庫/雷克斯圖片社
Von Karman cloud vortices above Alexander Selkirk Island, Chile. These naturally occurring vortices are crafted by wind patterns on the clouds
智利 Alexander Selkirk 島上空的馮·卡門云漩渦。這些自然形成的漩渦來自于風(fēng)對云的作用。
Photograph: Science Photo Library / Rex Feat/Science Photo Library / Rex Feat
圖片：科學(xué)圖片庫/雷克斯圖片社
Altocumulus undulatus clouds at Abruzzo national park, Italy. This cloud formation consists of parallel bands of cumulus clouds, occuring when wind shear affects a layer of altocumulus
意大利阿布魯佐國家公園的高積云波狀云。帶狀的積云平行排列后組成這種形狀的云，它一般出現(xiàn)在風(fēng)的切變對某層高積云產(chǎn)生影響的時候。
Photograph: Science Photo Library / Rex Feat/Science Photo Library / Rex Feat
圖片：科學(xué)圖片庫/雷克斯圖片社
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