Thunderstorm

Thunderstorm

Typically, the swirl of stormy weather obscures the cells at the heart of severe thunderstorms. This uncommonly clear view of an entire More »

Hole-punch clouds

Hole-punch clouds

Mysterious holes in clouds, such as this one, have long fascinated the public and, until recently, baffled scientists. New research

Why are clouds white?

Why are clouds white?

Why are clouds white? Photograph of Cumulus clouds in fair weather taken by Michael Jastremsk Clouds are made of water and clean water

How does fog form?

How does fog form?

How does fog form? Photo: NASA Fog is a cloud in contact with the ground. When the relative humidity approaches 100 percent, water