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Ursa Astronomical Association

Other special clouds - 9.5.2022 at 18.59 Kajaani Observation number 106697

Visibility III / V

Juho Pöllänen, Ursa (Pohjois-Suomi)

A horseshoe swirl under the side sun. The vortex disintegrated within about a couple of minutes of detection. Fortunately, there were also halos in the sky at the same time, as I had taken the camera closer to being available. Unfortunately, it was so far away that the images ended up with a disintegrating vortex.


Additional information
  • Havainto
    • Other special clouds
  • Other special clouds
    • Horseshoe cloud info

      A horseshoe vortex cloud occurs when an upward flow in the atmosphere collides with a horizontally moving air mass. This may cause a horizontally rotating vortex. If moisture condenses in the vortex into cloud droplets, a very rare upside-down U-shaped cloud shape can be observed. Often such a vortex is only visible for a very short time, perhaps a few tens of seconds or minutes.

      Typically, horseshoe clouds are said to be visible in the vicinity of supercellular storms, as they are associated with very strong upflows and wind torsions that are conducive to the formation of a vortex. Yet this cloud shape is observed just in conjunction with conventional Cumulus clouds and sometimes even very far from them against a completely blue sky. To detect this cloud, you should therefore be careful whenever cumulus cloud is generated as a result of upflows.

Comments: 5 pcs
Timo Alanko - 10.5.2022 at 17.38 Report this

Onpa tuokin vielä itseltäni bongaamatta. Tarkkaan olit havainnoinut :)

Tapio Lahtinen - 11.5.2022 at 15.51 Report this

Seuraavaksi animaatio :) En muista sellaista nähneeni.

Kalle Helenius - 12.5.2022 at 17.32 Report this

https://www.taivaanvahti.fi/observations/show/98970

Sieltä animaatio - joskin laadultaan hyvin karkea sellainen. 

Tapio Lahtinen - 12.5.2022 at 21.41 Report this

Kiinnostavia videoita oli aiemmassa.
On kyllä sen verran haastava ilmiö että timelapsen saaminen on aika lottovoitto.

Juho Pöllänen - 14.5.2022 at 10.26 Report this

Kiitokset kommenteista. En tiedä siitä tarkkuudesta. Tuuria pikemminkin, kun sivuauringon seutuvilla sattui näkymään ja oli siten helposti bongattavissa. Kameran tuottama kuvakulma hieman hämää, sillä pyörre näkyi livenä selvemmin. Animaatio ei kyllä käynyt edes mielen vieressäkään :)

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