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Ice codes

The Norwegian Ice Service provides ice codes from ”The Baltic Sea Ice Code”. The code consists of four sections; AB-SB-TB-KB. See description below.

Please see ”The Baltic Sea Ice Code” for more detailed description and images of ice types. A complete ice report consists of an area code followed by an ice code (for example CC1 4111).

AB 

0
1
2
3
4
5
6
7
8
9

/

Amount and arrangement of Sea ice.
Ice-free.
Open water.  Less than 1/10 ice.
Very open pack ice.  1/10-4/10 ice.
Open pack ice.  4/10-6/10 ice.
Close pack ice.  6/10-8/10 ice. 
Very close pack ice.  8/10-9/10 ice.
Compact pack ice.  10/10 ice. 
Fast ice with pack ice outside.
Fast ice. 
Lead in very close or compact pack ice or along the fast ice edge
Impossible to report

SB 

0
1
2
3
4
5
6
7

8
9

/

Stage of development (ice thickness)
New ice.  Less than 5cm.
Light nilas.  5-10cm.
Grey ice.  10-15cm.
Grey-white ice.  15-30cm.
White ice, first stage.  30-50cm. 
White ice, second stage.  50-70cm.
Medium first year ice.  70-120cm.
Ice predominately thinner than 15cm.
Ice predominately 15-30cm.
Ice predominately thicker than 30cm.
No info. or unable to report.

TB 
0

1
2

3
4

5
6

7
8
9
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Topography or form of ice
Pancake ice, ice cakes, brash ice.  Less than 20m across.
Small ice floes.  20-100m across.
Medium ice floes.  100-500m across.
Big ice floes.  500-2000m across.
Vast or giant ice floes. More than 2000m across.
Rafted ice.
Compacted slush or shuga, or compacted brash ice.
Hummocked or ridged ice.
Thaw holes or many puddles on ice.
Rotten ice.
No information or unable to report.


KB 
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2

3

4


5


6


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8
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Navigation conditions in ice.
Navigation unobstructed.
Navigation difficult or dangerous for wooden vessels.
Navigation dangerous for low-powered vessels.
Navigation only for high-powered vessels. 
Navigation proceeds in lead or broken ice-channel without assistance of an icebreaker.  
Icebreaker assistance can only be given to vessels suitable for navigation in ice and of special size.
Icebreaker assistance can only be given to vessels of special ice class and of special size.
Navigation based on approval only.
Navigation temporarily closed.
Navigation has ceased.
Unknown

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