- How and why Pileus clouds form at the top of a storm
![How and why Pileus clouds form at the top of a storm](http://www.skyartstock.com/peas/W953167P-SKYART.jpg)
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- How and why Pileus clouds form at the top of a storm. Dense, multiple Pileus clouds drape across a series of growing towers above a storm. Their thickness varies from minute to minute, and they form and vanish in the blink of an eye as air currents amplify or flatten in response to updraft strength from below.
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