(a) TECHNICAL SPECIFICATION
Humilis: little vertical extent and seemingly flattened.
(“Dry weather” denotes conditions without precipitation.)
The clouds corresponding to the code figure CL = 1 include the following:
(i) Cumulus in the initial stages of formation or in the last stages of dissipation.
(ii) Cumulus completely formed but frayed by a fairly strong and sufficiently turbulent wind; these Cumulus fractus are well separated and generally look white. The difference between these clouds and Cumulus fractus of wet weather is indicated in the explanation on specification CL = 7.
(iii) Cumulus completely formed with clear-cut horizontal bases; these clouds have either a flattened or deflated form, or show somewhat rounded tops without a cauliflower appearance.