Predominantly thin first-year ice with some new and/or young ice 4 020037 Predominantly new and/or young ice with some first-year ice 3 020037 New ice only (frazil ice, grease ice, slush, shuga) 0 020037 Predominantly medium and thick first-year ice with some old ice (usually more than 2 metres thick) 8 020037 Young ice (grey ice, grey-white ice), 10-30 cm thick 2 020037 All medium and thick first-year ice 7 020037 1 Nilas or ice rind, less than 10 cm thick 1 020037 Predominantly old ice 9 020037 Predominantly medium first-year ice (70-120 cm thick) and thick first-year ice (>120 cm thick) with some thinner (younger) first-year ice 6 020037 Missing value 31 020037 Unable to report, because of darkness, lack of visibility or because only ice of land origin is visible or because ship is more than 0.5 nautical mile away from ice edge 30 020037 All thin first-year ice (30-70 cm thick) 5 020037 Ice development 2014-09-03T09:54:51.374Z