Tunnel vision: Amazing cloud has a starring roll in the sky
Astronomers Robert Nemiroff and Jerry Bonnell, said: 'These rare long clouds may form near advancing cold fronts. 'In particular, a downdraft from an advancing storm front can cause moist warm air to rise, cool below its dew point, and so form a cloud. 'When this happens uniformly along an extended front, a roll cloud may form. via Claire Bates, dailymail.co.uk #Roll_Cloud #NASA #dailymail 'Roll clouds may actually have air circulating along the long horizontal axis of the cloud.'