Groups of waves with towering clouds above the top of the layer 8 020017 Missing value 15 020017 Broken cloud - large breaks 6 020017 undulating tops Two or more layers at different levels 9 020017 Continuous cloud 4 020017 undulating tops Broken cloud - small breaks 2 020017 flat tops Broken cloud - small breaks 5 020017 undulating tops Continuous or almost continuous waves with towering clouds above the top of the layer 7 020017 1 2014-09-03T09:54:44.333Z Isolated cloud fragments of clouds 0 020017 Broken cloud - large breaks 3 020017 flat tops Continuous cloud 1 020017 flat tops Cloud top description