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Ursa Astronomical Association
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Ursa Astronomical Association

Other special clouds - 13.1.2022 at 16.00 Vaasa Observation number 103730

Visibility I / V

Timo Alanko, Vaasan Andromeda

Surprisingly, the heat of the upper atmosphere dropped to 80 degrees in the sea. The clouds destroyed the pearl emergency room, but the winds built several handsome waves. Here are some of them.


Additional information
  • Havainto
    • Other special clouds
  • Other special clouds
    • Kelvin-Helmholtz cloud info

      The Kelvin-Helmholtz clouds are among the most exotic apparitions in the cloud world.

      They resemble regular waves in shape, typically several in succession. String wave strings are created at the top of the cloud mass when there are layers of air moving at different speeds in the air.

      If there is moisture in one layer of air, it may rise into waves in another layer of air moving at different speeds. There is Kelvin-Helmholtz instability between the air layers at that time, from which the cloud waves are named.

      Waves in lakes and seas are the result of this same instability between layers moving at different speeds. Kelvin-Helmholtz waves can also be seen in the gas circles of Jupiter and Saturn, for example.

      Only clearly wavy cases can be called Kelvin-Helmholtz clouds. It is good to be careful not to confuse them with conventional undulatus clouds. The cloud types can be difficult to identify, especially when viewed from the side.

      In a real Kelvin-Helmholtz cloud, the wave structure is clear. Only well-developed and undisputed Kelvin-Helmholtz clouds are collected to the Sky Watch database.

      Wavy Kelvin-Helmholz clouds. Image Grahamuk / Wikipedia.

      Tom Eklund observed these Kelvin-Helmholtz clouds in Finland.

Comments: 3 pcs
Timo Alanko - 13.1.2022 at 18.14 Report this

Nullschoolin seuranta näyttää Pietarsaaren edustalle Merenkurkkuun 10 hehtoPascalin  korkeudella (26km) -85 astetta! Föhn-tuultakin tiedossa. Toivottavasti taivas huomenna edes vähän repeilisi...

Timo Alanko - 14.1.2022 at 09.54 Report this

Kummasti soutaa tuo yläilmakehän lämpötila. Nyt Pietarsaaren edustalla enää -69 astetta :(

Marko Myllyniemi - 14.1.2022 at 18.43 Report this

Komeat on aallot!

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