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Ursa Astronomical Association

Cloudbow visible from the ground - 2.2.2023 at 11.25 - 2.2.2023 at 11.45 Raisio Observation number 111833

Visibility II / V

Such an attention-grabbing cloud brightening raised the suspicion of a possible cloud arc stump. It looked very unusual in the otherwise evenly toned cloud front. The sky was completely clear on the sunny side, so there was no ray of light caused by shading.

A clearly lighter spot in the front stood out even when the clouds were lower on the horizon. In these pictures, the case emerges perhaps most clearly. The distance from the center of one's own shadow to the point of lightening remained approximately 40 degrees during the time I was monitoring the situation.

Additional information
  • Lightsource of the phenomenon
    • Sunlight
  • Rare atmospheric phenomena
    • Cloudbow visible from the ground info

      Pilvikaari on harvinainen, pilviin piirtyvä väreiltään hailakka sateenkaaren sukulainen joka näkyy Aurinkoa vastapäätä. Pilvikaarta paras etsiä kun Aurinko on matalalla. Tällöin kaari on helpoiten nähtävissä sen noustessa verraten korkealle taivaalle. 

      Pilvikaarta ei tule sekoittaa sumukaareen joka muutoin on samanlainen ilmiö, mutta näkyy sumussa tai sumupilvessä.

      Pilvikaari ei näy sateessa eikä sumussa, vaan se piirtyy pilven muotoihin. Kuva Mikko Peussa.

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