Ever seen a roll cloud in action? Watch this | The Senior | Senior
Rare roll cloud sweeps across Durban, South Africa | Natural World | Earth Touch News
Incredible giant roll cloud looms over houses | Daily Mail Online
Cloud waterfall' rolls over mountains | These two men woke early to climb Bluff Knoll in Western Australia to catch the sunrise, and were greeted by an endedless sea of clouds rolling
Morning glory brings gliders from far and wide to surf spectacular, rare cloud formation - ABC News