Tornadoes form when winds blowing in different directions meet in the cloud and begin to turn in circles.

VOA: special.2009.06.09

Air traffic over much of Europe came to a halt for six days because of the huge cloud of ash from a volcano in Iceland.

VOA: special.2010.04.23

The Flying Cloud had set a record for sailing from New York to San Francisco.

VOA: special.2009.12.23

Many companies are moving to cloud computing.

VOA: special.2011.06.17

So we all went up to the Space Needle to watch the fireworks and this big cloud moved in and covered the Space Needle and so we just kind of watched the clouds and that was it."

VOA: special.2010.07.02

The American Civil Liberties Union wants to make sure the "cloud" does not rain on people's privacy.

VOA: standard.2010.06.22

Meteorologists and aviation authorities are monitoring wind direction and the ash cloud's movement from Iceland to determine where and when to shut down airspace in Europe.

VOA: standard.2010.04.15

"We become afraid to use those services. We don't trust the fact that when we put our data into one of these cloud service providers that it is actually going to be protected."

VOA: standard.2010.06.22

It's completely out of date." Stanley says inconsistencies in the law have made it easier for law enforcement and government agencies to demand that service providers give them consumer data stored on cloud servers.

VOA: standard.2010.06.22

And Flynn says the cloud is spreading. "The southern part of Europe is for the most part clear (OMITTED) but the volcanic ash cloud is anticipated to extend slightly further south and eastward during this night."

VOA: standard.2010.04.16