NASA: Roll Cloud off Coast of Brazil, page 1

Roll Clouds, or Arcus clouds are another amazing bit of nature:

The photo above showing a sinister looking roll cloud was taken aboard ship while en route from Paranagua, Brazil to Montevideo, Uruguay. A cloud feature like this isn't something you would want to run into on the open sea or on a crowded highway, but roll clouds (arcus cloud) aren't necessarily a presage of severe weather. They most often form along the leading edge of a mature thunderstorm in the relatively cool air associated with the storm's downdraft; however, they're detached from the storm itself and may be seen to roll or tumble along their horizontal axis. Photo taken on February 6, 2012.

NASA link

There are two types of arcus clouds, roll clouds and shelf clouds:

The main difference between roll clouds and shelf clouds (both are called arcus clouds) is that a roll cloud is detached from the parent thunderstorm, whereas a shelf cloud is affixed to the base of a cumulonimbus cloud.

nasa

I've always though clouds were amazing, I'm working on a stop motion video of them amongst many other things... here is someone else's that shows them literally rolling like a wave:


Some they don't even understand:

wired




Some more roll cloud/arcus clous pics and videos:

nasa

telegraph.co.uk








blogto.com

Russel White

Dan Bush

Susan Mace






wikipedia

reply to post by boncho

---

aahahaha

But nice thread OP. I love watching thunderstorm fronts roll in, they're so pretty

reply to post by pianopraze

---

These clouds are so ominous looking...
This is the best collection I have ever seen!
Good work!

I have one to add:

www.dailymail.co.uk

Rob Sharrock snapped up his Nikon D300 and dashed out to capture this monstrous
roll cloud which seems to go on forever.

Mr Sharrock , from Warrnambool, Victoria, Australia, lives in the house
with the awning to the left of the frame.

Originally posted by Shadowalker
UFO flying in the blogto picture. The one with all the cranes.

No really silver disk in front of the cloud.

edit on 5-3-2012 by Shadowalker because: (no reason given)

cool beans

feel free to go post it over in the UFO forum, you'll probably get lots of stars, let's keep this thread on topic, thanks!

Here's another roll cloud for those following the thread:

Barry Slade

reply to post by Shadowalker

---

i had to scroll up and double check but i see what your talking about, interesting, to say the least it looks like an old school UFO. lol. any one have the ability to zoom and and check it out i imagine its just an "image artifact"

reply to post by burntheships

---

Beautiful!

It seems quite a lot of these happen in Australia.

Here in the USA I've seen lots of shelf clouds but no roll clouds:

zmescience.com

Originally posted by boncho
Wow, look at the size of those chemtrails.





...kidding.

S&F

I've seen these clouds called chemtrails, this video in particular...

Originally posted by crimsongod21
reply to post by Shadowalker

---

i had to scroll up and double check but i see what your talking about, interesting, to say the least it looks like an old school UFO. lol. any one have the ability to zoom and and check it out i imagine its just an "image artifact"

Sometimes photo artifacts are just aftifacts... I have a thread on this topic: my lens flare thread

Please stay on topic of arcus roll and shelf clouds... thank you!

Here's an on topic video with lots of pictures:

reply to post by pianopraze

---

Absolutely stunning!!

I just hope I'll be lucky enough to one day see formations such as these. Here in the UK it tends to just be the usual miserable clouds.

reply to post by pianopraze

---

Very beautiful natural phenomenon. I have not been lucky enough to see one in person, but I sure hope to.
Thanks!

California going off!
  Posted 16 days ago with 146 member flags

Ice Age Flower Blooms After 32000 Years!
  Posted 15 days ago with 79 member flags

Experts Warn Mount Fuji is Dangerously Close to Erupting
  Posted 5 days ago with 66 member flags

Man building his own island out of plastic bottles
  Posted 12 days ago with 59 member flags

It is Possible The Cali Swarm is Volcanic Activity from the Salton Buttes Volcanic Field
  Posted 16 days ago with 53 member flags

Magnitude 7.9 - OFF THE COAST OF COSTA RICA (Tsunami Watch in Effect!)
  Posted 6 days ago with 53 member flags

Simple way to discover if your produce is GMO.
  Posted 2 days ago with 46 member flags

Illegally Dumping Millions of Gallons of Fracking Wastewater in Streets and Rivers at Night
  Posted 6 days ago with 42 member flags

Newest topics, updated in real-time:

Newest topics getting flags, in real-time:

Newest topics getting replies, in real-time: