There's a very small chance that a roll cloud can turn into a spherical cloud, this one was observed in Japan 2016. : r/nevertellmetheodds
Encore - Roll Cloud Over Calgary, Alberta - EPOD - a service of USRA
Shelf Clouds and Roll Clouds: Not Tornadoes, But Still Scary and Ominous (PHOTOS) | The Weather Channel
Do you remember? - Roll cloud draws eyes to sky | Southlands Sun
Rhode Island Roll Cloud Looks Otherworldly - Videos from The Weather Channel
A Dramatic Roll Cloud Briefly Overtakes Chicago | Colossal
Watch: Freaky cloud rolls over Lake Michigan | WLUK
Roll Clouds of Sable Island - Sable Island Institute
Incredible footage shows beautiful 'roll cloud' in new Orleans | Daily Mail Online
Fognado' in Santa Cruz was a roll cloud, meteorologists say
Sideways funnel cloud? Nope — Little Catalina sees roll cloud | CBC News
Roll Clouds - Clouds That Look Like a Tidal Wave - YouTube
A Dramatic Roll Cloud Briefly Overtakes Chicago | Colossal
Rare roll cloud sweeps across Durban, South Africa | Natural World | Earth Touch News
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13 Ominous Photos and Videos of Roll Clouds
Bizarre, Giant Tubular Cloud Rolling Across the Sea (Photo) | Live Science
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Breakdown: Why 'roll clouds' are unique formations
File:Roll-Cloud-Racine.jpg - Wikimedia Commons
Roll cloud captured on video in Northern Michigan - YouTube
Viral Video Shows Tsunami-Like Clouds, Internet Calls It "Terrifying Yet Majestic"
Rare roll cloud sweeps across Durban, South Africa | Natural World | Earth Touch News
Arcus cloud - Wikipedia
Totally tubular! Unusual clouds seen in Ohio
Unbelievably Fantastic Facts About Roll Clouds - Science Struck
