Eye-catching night shining clouds - 20.7.2021 at 23.40 - 21.7.2021 at 03.15 Mäntyharju Observation number 99778

Visibility V / V

Jukka Kytömäki

The evenings get dark and the night clouds shine almost all over the sky. The midnight belts were long lasting, but waves and streaks occasionally appeared in the mix. My pictures are in chronological order. In the picture, the two cross stripes in the middle seem to break the belt stripes. The ripple of some sort is probably on the same level. In Figure five, there are several as if they were like a hole cloud. After my description, the sky is still occupied by belts far south.

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Additional information

Havainto
- Night shining clouds
Cloud coverage in the sky
- Covered 7/8 of the sky
Noctilucent clouds
- Unusual forms
  
  Relatively rarely, there are special shapes in the night shining cloud displays that do not belong to the shapes listed above. Such may be, for example, thick lumpy formations that appear as some kind of patches. They may also be associated with an unusual color tone.
- Swirl
  
  Swirls are curved night shining cloud forms. For example, a single night cloud belt or group of waves may be curved on a clear bend.
  
  The arrow indicates a slight vortex in the night cloud belt. Photo by Joni Tahkoniemi.
  
  Strong swirls in image taken by Veikko Mäkelä.
- Waves
  
  Waves of noctilucent clouds are short, close groups of clouds.
  
  Wavy NLC by Jari Luomanen.
  
  NLC waves by Hannu Määttänen.
- Band
  
  Bands of noctilucent clouds are long, stripe like cloudformation.
  
  A single, very bright NLC band. Photo by Mikko Peussa.
  
  On the upper left corner, rising bands are clear on the image. Whereas waves of NLC cover the bottom right side of the image. Photo by Juha Tonttila.
- Veil
  
  The night cloud vail is a vague thin night shining cloud with no clear structure.
  
  Noctilucent cloud veil with one strong belt formation. Image by Veikko Mäkelä.

Brightness of the noctilucent clouds
- Eye-catching night shining clouds

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Eye-catching night shining clouds - 20.7.2021 at 23.40 - 21.7.2021 at 03.15 Mäntyharju Observation number 99778