Roll cloud over Chicago!

Reader Michael sent me this gif from Colossal, showing a “roll cloud” that came over Chicago with the cold front last evening:

Roll clouds are also called “arcus clouds,” and Wikipedia tells how they form. It’s too complicated to summarize, so just click the link if you want to learn about them and their relatives the “shelf clouds.”

Since I always try to end the day with an animal, here’s a gif on the same page, showing a cool Kikkerland Design animal tool, with 7 functions, that you can buy for only $20:



  1. Diana MacPherson
    Posted August 31, 2016 at 3:53 pm | Permalink

    Kikkerland has cool stuff. I just bought insect magnets from them.

  2. Heather Hastie
    Posted August 31, 2016 at 8:58 pm | Permalink

    Cool cloud gif!

  3. Posted August 31, 2016 at 9:13 pm | Permalink

    Many years ago, I saw a low cloud like that come over the farm, much lower than the rest of the clouds and accompanied by wind. It was spooky.

  4. Christopher
    Posted August 31, 2016 at 9:44 pm | Permalink

    super cool! That cloud looks like you could surf on it!

    • Gordon
      Posted September 1, 2016 at 3:21 am | Permalink

      Yep- I thought it as a tsunami when half looking at the page opening

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