...In contrast, the smooth white cloud on top may be water condensation that resulted from rapid rising and cooling of the air mass above the ash column. This cloud, which meteorologists call a pileus cloud, is probably a transient feature: the eruption plume is starting to punch through. The structure also indicates that little to no shearing wind was present at the time to disrupt the plume...
Sarychev Peak Volcano -- Awesome pic
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Sarychev Peak Volcano -- Awesome pic
http://earthobservatory.nasa.gov/IOTD/view.php?id=38985
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