Met Office: CH6 Cs increasing and above 45° elevation

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C_H6 Cs increasing and above 45° elevation

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Gallery
© R.K. Pilsbury	© R.K. Pilsbury

Gallery

If the cirrostratus of C_H5 continues to invade the sky so that its continuous part extends more than 45 degrees above the horizon, without covering the whole sky, the coding becomes C_H =6. The cirrostratus generally grows denser as a whole as it progresses, often still preceeded by cirrus as described under C_H5.

These photographs were taken 30 minutes apart and show C_H5 (left) developing into C_H6 (right). In the earlier picture contrails can be seen crossing the sky. In the later photograph the contrails have become obscured by the thickening cirrostratus. Small cumulus clouds can be seen in both photographs.

Classification
Description: Cirrostratus progressively invading the sky and generally becoming denser, the continuous veil extends more than 45° above the horizon without the sky being totally covered.	Designation: C_H=6 (C2)
Latin name: Cirrostratus nebulosus (Cs neb) or Cirrostratus fibratus (Cs fib).

Classification

Description:
Cirrostratus progressively invading the sky and generally becoming denser, the continuous veil extends more than 45° above the horizon without the sky being totally covered.

Designation:
C_H=6 (C2)

Latin name:
Cirrostratus nebulosus (Cs neb) or Cirrostratus fibratus (Cs fib).