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Can Anyone identify this formation?

Can Anyone identify this formation?

Forums › The Cloud Forum › Can Anyone identify this formation?

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    • April 22, 2015 at 7:29 pm #78836
      Richard Tighe avatarRichard Tighe
      Participant

      This photograph was taken in Manley, New South Wales, on the evening of March 24, 2015. Weather conditions were calm and it was about 20 degrees C. I have never before seen anything like this on the underside of what I assume is a stratus layer.https://cloudappreciationsociety.org/wp-content/uploads/album/14850/11082651_10153298691224369_6059104539185757053_n1-700x525.jpg

    • April 23, 2015 at 12:17 am #78853
      Howard Brown avatarHoward Brown
      Participant

      In short, no, Richard, and I have never seen anything like it either. Assuming it was not raining, I guess you can rule out Nimbostratus. I guess someone will say asperatus

      I don’t think you can rule out Stratocumulus, particularly at the top, and the bottom where it might be lenticularis? There might be undulatus in between?

      ICA Vol II, pages 28 and 29, show Stratus nebulosus. It mentions things like the height of the cloud base not being uniform, being thinner in parts e.g. near your horizon; differences in optical thickness may reveal undulatus.

      Great picture. Many thanks.

    • April 23, 2015 at 9:47 pm #78864
      Catherine Kearns avatarCatherine Kearns
      Participant

      As mentioned, it is evening but I don’t know the clouds approximate height.
      Your cloud is so beautiful.
      I get the impression the cloud has captured the sunlight and shows as a lovely Noctilucent cloud.
      Your location is in the northern climes where these clouds readily show themselves.
      This is my guess

      How grand it must have felt to see this lovely display. Thanks for sharing
      Member 37993
      Cate

    • April 24, 2015 at 8:25 pm #78895
      marc de cleyn avatarmarc de cleyn
      Participant

      i am a starter, studying the art of clouds. and writing the english language. what does the “ICA Vol II, pages 28 and 29″mean.
      marc

      • April 24, 2015 at 11:47 pm #78898
        Howard Brown avatarHoward Brown
        Participant

        Hallo, Marc, and welcome. ICA = International Cloud Atlas, Manual on the Observation of Clouds and Other Meteors, World Meteorological Organization. Volume I, Revised edition 1975, is a technical manual; Volume II 1987 is 212 pages of pictures – page 28 Stratus nebulosus undulatus, page 29 Stratus nebulosus.

        I use these books a lot, but to be honest I don’t think many others do. They are available on-line:

        ICA Vol I & II

        We learnt on the old forum that the ICA will be updated one day by WMO.

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