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WMO Total Concentration Colour Code Standard - Sea Ice
Colour | RGB colour model | Total concentration (definition from WMO Nomenclature) | |
alternative | prime | ||
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000-100-255 | Ice free |
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150-200-255 | Less than one tenth (open water) | |
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140-255-160 | 1/10 - 3/10 (very open ice) | |
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255-255-000 | 4/10 - 6/10 (open ice) | |
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255-125-007 | 7/10 - 8/10 (close ice) | |
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255-000-000 | 9/10 - 10/10 (very close ice) | |
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150-150-150 | Fast ice | |
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210-210-210 | Ice shelf | |
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255-255-255 | Undefined ice | |
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255-175-255 | 7/10-10/10 new ice |
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255-100-255 | 9/10-10/10 nilas, grey ice (mainly on leads) |
WMO Stage of Development Colour Code Standard - Sea Ice
Colour | Stage of development (SoD) | Thickness | |
alternative | prime | ||
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Ice free | |
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<1/10 ice of unspecified SoD (open water) | ||
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New ice | < 10 cm | |
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Grey ice | 10-15 cm | |
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Grey-white ice | 15-30 cm | |
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First-year ice (FY) | >= 30 cm | |
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FY thin ice (white ice) | 30-70 cm | |
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FY medium ice | 70-120 cm | |
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FY thick ice | > 120 cm | |
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Old ice | ||
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Second-Year Ice | ||
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Multi-Year Ice | ||
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Fast Ice of Unspecified SoD | ||
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Ice shelf | ||
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Ice of undefined SoD | ||
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Drifting ice of land Origin (icebergs) |
WMO Stage of Development Colour Code Standard – Sea Ice/additional codes
Colour | Stage of development (SoD) | Thickness | |
alternative | prime | ||
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Dark nilas | <= 5cm | |
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Light nilas | > 5 cm | |
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Young ice | 10-30 cm | |
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FY thin ice (white ice) first stage | 30-50 cm | |
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FY thin ice (white ice) second stage | 50-70 cm |