۱۳۹۱ شهریور ۱۹, یکشنبه

Volcano and Waterspout, Hawaii







Photograph by Steve and Donna O’Meara, National Geographic
The eruption of Hawaii’s Kilauea volcano inspires the formation of a waterspout in this undated photo.
Waterspouts can emerge the way traditional tornadoes do, but not always. Many are created
when near-surface winds suddenly change direction under a cloud that is producing a growing updraft. Unlike a tornado, a waterspout vortex and funnel cloud are created from the ground, or water, up.

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