|An ice storm coats tree branches in downtown St. Louis during the major ice storm of December 1, 2006. Even the arch has a coating of ice and snow on its top. An ice storm is caused by freezing rain, which coats everything on the ground with a glazing of ice. The tremendous weight of the ice will break tree branches, limbs and power lines - causing widespread power outages and vegetation damage. The St. Louis ice storm of 2006 left nearly 500,000 homes without power.
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