DENVER
08/15/2010 05:12 am ET | Updated May 25, 2011

Boulder's National Center For Atmospheric Research: Planes Make It Rain

BOULDER - Scientists at the National Center for Atmospheric Research in Boulder figured out that planes often inadvertently affect weather when flying through clouds, making it rain or snow.

The conditions have to be just right. It has to be a specific type of plane, a certain cloud and a certain temperature.

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