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Related: Editorials & Other Articles, Issue Forums, Alliance Forums, Region ForumsNASA'S picture of the day (stunning)
Roll Cloud Over Uruguay
Explanation: What kind of cloud is this? A roll cloud. 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. Roll clouds may actually have air circulating along the long horizontal axis of the cloud. A roll cloud is not thought to be able to morph into a tornado. Unlike a similar shelf cloud, a roll cloud, a type of Arcus cloud, is completely detached from their parent cumulonimbus cloud. Pictured above, a roll cloud extends far into the distance in 2009 January above Las Olas Beach in Maldonado, Uruguay.
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NASA'S picture of the day (stunning) (Original Post)
Playinghardball
Jun 2013
OP
niyad
(115,079 posts)1. beautiful--thank you for posting.
petronius
(26,621 posts)2. Very cool; thanks for posting! (nt)
SidDithers
(44,228 posts)3. Very cool...
another interesting one is a hole-punch cloud, formed when some freaky things happen with ice crystals and condensation.
Sid
Benton D Struckcheon
(2,347 posts)4. Wow.
That is seriously weird. I'd be diving into the basement with my tin hat on if I saw that.
Aerows
(39,961 posts)5. Gorgeous
Beautiful beach.
Curmudgeoness
(18,219 posts)6. Seeing that would be unsettling.
It is beautiful, but it is something that I would have no idea what was coming.
L0oniX
(31,493 posts)7. Chem trail?
cyberswede
(26,117 posts)8. I saw one once on my way to work.
It was fascinating - I called people to ask if they could see it, too. When I got to work, people were buzzing about it.
The coolest thing was seeing it from different angles as I drove the 15 miles to work. It started out in front if me, and as my position moved (as well as the cloud's, I presume) it was above me, and then behind me. It was remarkable. I wish I'd had a camera.
The Straight Story
(48,121 posts)9. Looks like a giant joint
midnight
(26,624 posts)10. K&R