Observing Clouds

High-level cloud classification aid

(Section 2.8.4.3)

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Cc C_H 9 Granular shaped elements, sometimes with small wavelets.	Yes
				No
Cs neb C_H 7 Light, uniform and nebulous veil, may produce halo phenomena.	Yes		Yes
		No		No
Cs C_H 8 Edge of the veil may be clear cut or frayed.	Yes				Yes	Ci unc / fib invading C_H 4 Hooks and filaments, thickening as a whole.
		No		No
Cs > 45° C_H 6 Cs or Cs + Ci	Yes				Yes	Ci spi cbgen C_H 3 Dense remains or the upper part of a Cb.
		No		No
		Cs ≤ 45° C_H 5 Cs or Cs + Ci			Yes	Ci spi C_H 2 Dense patches er entangled sheaves.
				No
				Ci fib / unc C_H 1 Filaments, strands or hooks.

Figure 13. Cloud classification aid C_H

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The text enclosed in grey-shaded boxes, like this example, comprises Annex I to the Technical Regulations (WMO-No. 49) and has the legal status of standard practices and procedures.

High-level cloud classification aid

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