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Ursa Astronomical Association

Other special clouds - 9.6.2021 at 20.46 Ikaalinen, Sisättö Observation number 98872

Visibility IV / V

Heidi Rikala, Ursa (Helsinki)

During the thunderstorm, I noticed a cloud like that with thin layers on top of each other. Thunder roared, but it wasn't quite right.

I don’t really know if this is any special cloud, but I hope the maintenance will check it out.

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

      Pileus stack

      The pileus cloud typically occurs at the top of a thundercloud, forming a hat-like leaf above the main cloud. If at least three reeds are visible, the object can be considered a pileus stack.

      In situations where the top of the main cloud passes through the reeds, it is more like a velum cloud (veil cloud).


      Image by Jari Ylioja

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