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Ursa Astronomical Association
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00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Other special clouds - 20.7.2020 at 21.03 - 20.7.2020 at 21.06 Jalasjärvi Observation number 92203

Visibility III / V

Esa Palmi, Ursa (Länsi-Suomi)

Such a thing arose in the place of the avalanche of a dead thunder cloud. Likely to meet Asperitas requirements. Interesting ripple, less often myself become so clearly received.


Additional information
  • Havainto
    • Other special clouds
  • Cloud coverage in the sky
    • Covered 1/4 of the sky
  • Other special clouds
    • Undulatus asperitas info

      The Undulatus asperitas cloud was approved for the International Cloud Classification in 2015.

      Previously, the cloud was called Undulatus asperatus. These are udders resembling mammatus clouds, which, however, are wavy in their basic shape.

      Undulatus asperitaxis has typically been observed in the morning and noon hours after convective thunder cell formation.

      Either clear or spectacular undulatus asperitaxes are collected in the sky. Strong, large-scale and clearly perceptible waves should be visible on the underside of the cloud. Sample images of undulatus asperitas.

      Undulatus asperitas -clouds. Photo by Miikka Mäkinen.

Comments: 1 pcs
Marko Myllyniemi - 21.7.2020 at 00.52 Report this

Pohjanmaalla on kyllä ilmakehä ollut tänään liikkeessä aamusta alkaen ihan kiitettävästi.

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