isoneph

iso- +‎ Ancient Greek νέφος (néphos, “cloud”) (see nepho-).

isoneph (plural isonephs)

1. An isoline indicating equal cloud cover.
   • 1962, D. E. Pedgley, “A meso-synoptic analysis of the thunderstorms on 28 August 1958”, in Geophysical Memoirs‎, number 106, UK Meteorological Office, page 23:

     After plotting the amounts in oktas, isonephs were drawn at two-okta intervals. Closely spaced isonephs indicate a sharp edge to a cloud sheet, the edge approximately coinciding with the four-okta isoneph. A station reporting four oktas and lying in a region of close isonephs would have one side of its sky relatively cloudfree and the opposite side covered.

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