<p>"Big boomer" clouds form in the late afternoon over the shifting sand dunes where plants have tenuous footholds.  
</p>
Gray and white clouds loom over gold sand.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/41585865@N06">Western Arctic National Parklands</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nps_wear/8490331020/">Nature's Power and Grace</a>