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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Other special clouds - 31.7.2021 at 12.49 Pyhäranta Observation number 100109

Visibility IV / V

Pirjo Koski, Porin Karhunvartijat

Will it go into a stack?

I saw these almond-like clouds during the day, first in Laitila and then in Pyhäranta, where there is also a picture.


Additional information
  • Havainto
    • Other special clouds
  • Cloud coverage in the sky
    • Very small area
  • Other special clouds
    • Stacked lenticularis info

      Stacked lenticularis clouds, is a phenomenon in which there are several lentil-like clouds piled on top of each other. In the sky watch, the practical boundary between the conventional altocumulus lenticularis and the rarer lenticularis stack is considered to be at least three overlapping lenticular, i.e. layer-like, clouds.

      Lenticularis clouds are streamlined, flat cloud shapes. Typically, they occur when a mountain or mountain causes a vertical disturbance to the air flow. At the top of the resulting air wave, moisture may condense into cloud droplets, allowing a smooth lenticular layer to be observed. Sometimes such clouds also form without strong terrain in connection with various weather phenomena.

      Lenticularis clouds themselves are not uncommon and they can be seen quite often. Overlapping lentil cloud layers are clearly a less frequently seen phenomenon. Such a layerish pile cloud is formed when the wetter and drier layers of air alternate in the air. At that time, moisture condenses in some layers and not in others, so that even a very large number of lenticular layers can be detected.

      Only such clearly formed, layered lenticular clouds are collected in the sky due to their rarity.

      In Iceland, a layered lenticular cloud formed in a wave caused by mountains. Image from Wikipedia.

Technical information

Canon EOS 6D, Canon 24-107mm

Comments: 2 pcs
Marko Myllyniemi - 31.7.2021 at 20.18 Report this

Hienot "lentikset"!

Pirjo Koski - 31.7.2021 at 22.21 Report this

Kiitti :) Harmillisesti taivaalla seilasi muitakin pilviä katkomassa näkyvyyttä eikä oikein kunnollista pinoa ilmaantunut. 

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