Cu med/fra compared with Sc flo

(Section 2.3.9.6.4)

Cumulus mediocris (with irregular bases and ragged in parts due to fresh to strong winds) and Cumulus fractus (frayed by strong winds) are distinguished from Stratocumulus floccus by:

• Part of the base being flat (Stratocumulus floccus usually has a very ragged lower part; if there is evidence of a flat base it rapidly dissipates)
• The vertical structure of the cloud leaning strongly downwind
• Continuous and rapid changes in the outlines of Cumulus fractus

If there is doubt as to the identification, the cloud is identified as the appropriate Cumulus species.