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Ursa Astronomical Association
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taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Other special clouds - 17.5.2022 at 09.33 - 17.5.2022 at 09.35 Helsinki Observation number 106838

Visibility III / V


Apparently the Horseshoe Swirl was visible above the center of Helsinki for a while. The vortex lasted for an estimated maximum of 2 minutes. The pictures were taken from Jätkäsaari in the direction of Eira on a mobile phone in a hurry.


Additional information
  • Havainto
    • Other special clouds
  • Cloud coverage in the sky
    • Very small area
  • 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: 1 pcs
Mikko Peussa - 17.5.2022 at 23.46 Report this

Hieno havainto!

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