News tagged with volcanic ash clouds

How atmospheric rivers form

If you want to assign blame on an overcast day, then cast your eyes on the tropics. Water vapor originating from the Earth's tropics is transported to midlatitudes on long filaments of flowing air that intermittently ...

dateJun 09, 2015 in Earth Sciences
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NASA image: Night-shining clouds

In the late spring and summer, unusual clouds form high in the atmosphere above the polar regions of the world. As the lower atmosphere warms, the upper atmosphere gets coooler, and ice crystals form on meteor ...

dateJun 22, 2015 in Earth Sciences
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