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Rolling thunder

Rolling thunder

Thunderstorms produce a lot of weird things, which are often easy to miss amid the urgency of tornadoes, floods and lightning. But before a storm arrives, or sometimes out of the blue, rare "roll clouds" like this one command attention as they float ominously overhead.
 
"It was amazing," photographer Rob Sharrock told ZUMA Press in 2010, after shooting this roll cloud over Warrnambool, Australia. "I just looked up in the sky and said, 'Bloody hell, what on Earth is that?' It seemed to go on for miles."
 
To see more, and to find out what causes these stormy spindles, check out the following gallery of nine rockin' roll clouds from around the world. (Text: Russell McLendon)

Shelf Esteem

Shelf Esteem

Thunderstorms and politicians are a lot alike: Both drift with the wind, both are full of hot air and both shy away from high pressure. And, fair or not, many people judge both by their faces.
 
While politicians grin for votes, though, storms glower over their constituents. Some even grow strange "shelf clouds" along their leading edges, like the one pictured here over Enschede, Netherlands. These cloudy countenances stretch out ahead of a storm, sometimes foreshadowing danger and sometimes just grandstanding.
 
To see more scowling storms, and to find out what causes them, check out the following photo gallery of nine frightening shelf clouds. (Text: Russell McLendon)