A rare total cloud inversion is pictured from Shoshone Point on the South Rim of the Grand Canyon National Park in Grand Canyon, Arizona in this December 1, 2013 picture provided by the National Park ... more 
A rare total cloud inversion is pictured from Shoshone Point on the South Rim of the Grand Canyon National Park in Grand Canyon, Arizona in this December 1, 2013 picture provided by the National Park Service. Cloud inversions are formed through the interaction of warm and cold air masses. Picture taken December 1. REUTERS/NPS photo by Erin Whittaker/Handout via Reuters (UNITED STATES - Tags: ENVIRONMENT TRAVEL) ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS less 
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Reuters | Photo By HANDOUT / REUTERS
Tue, Dec 3, 2013 6:19 PM EST