Top

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- Cirrus (often in bands) and Cirrostratus, or Cirrostratus alone

- progressively invading the sky

- generally growing denser as a whole

- continuous veil extends more than 45 degrees above the horizon

- sky not being totally covered

from the top downward:

photo by Kruegler

photo by R.K. Pilsbury (Crown copyright)

photo KNMI

photo by R.K. Pilsbury (Crown copyright)