A note overlaid on the video says, "Never in my life have I seen a cloud so big it blocks the sunrise all the way across the sky." The clip has amassed 4 million views since it was first shared on ...

'UFO' appears in the sky just weeks after eagle-eyed Aussies spotted unusual 'spaceship' cloud READ MORE: What's behind waves of drones appearing in US skies By BRETT LACKEY Published: 00:56 EDT ...

The new cloud was first observed by an amateur cloudspotter in Cedar Rapids, Iowa, in 2006 and brought to the attention of the UK based Cloud Appreciation Society.