The following codes are used to denote stages of development for freshwater ice:
Stage of development
Code figure
New Ice (05 cm)
1
Thin Ice (515 cm)
4
Medium Ice (1530 cm)
5
Thick Ice (3070 cm)
7
First Stage Thick Ice (3050 cm)
8
Second Stage Thick Ice (50cm)
9
Very Thick Ice (70120 cm)
1.
Forms of sea ice
Forms of sea ice (Fa, Fb, Fc) indicate the floe size corresponding to the stages iden-
tified in Sa, Sb, and Sc, respectively. The following codes are used to denote forms of
sea ice:
Forms of sea ice
Code figure
New Ice (010 cm)
X
Pancake Ice (30 cm3 m)
0
Brash Ice (<2 m)
1
Ice Cake (320 m)
2
Small Ice Floe (20100 m)
3
Medium Ice Floe (100500 m)
4
Big Ice Floe (500 m2 km)
5
Vast Ice Floe (210 km)
6
Giant Ice Floe (>10 km)
7
Fast Ice
8
Ice of Land Origin
9
Undetermined or Unknown
(Iceberg, Growlers, Bergy Bits)
/
(Used for Fa, Fb, Fc only)
The following codes are used to denote forms of sea ice for freshwater ice:
Forms of sea ice
Code figure
Fast Ice
8
Belts and Strips
symbol followed by the
~F
concentration of ice
89
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