Table AIV-16.—WMO CODE 3551
WMO CODE 3551
Rs - Rate of ice accretion on ships.
Code
Ice increase or decrease
0
Ice not building up.
1
Building up slowly.
2
Building up rapidly.
3
Melting or breaking up slowly.
4
Melting or breaking up rapidly.
Table AIV-17.—WMO CODE 0639
WMO CODE 0639
ci - Concentration or arrangement of sea ice.
Code
Description
0
No ice in sight.
1
Ship in open lead more than 1 nm wide, or ship in fast ice with ice edge out of sight.
2
VERY OPEN PACK ICE - less than .3
Ice concentration uniform
Ship in ice or within
in observatin area.
.5 nm of ice edge.
sea covered.
3
OPEN PACK ICE - .3 to .6 sea covered.
4
CLOSE PACK ICE - .7 to .8 sea
covered.
5
VERY CLOSE PACK ICE - .9 sea
covered.
6
Strips or patches of pack ice with open
Ice concentration not
water between.
uniform.
7
Strips or patches of close or very-close
pack ices with lesser concentration
between.
8
Fast ice with open water or open pack
ice seaward.
9
Fast ice with close or very close pack
ice seaward.
/
Unable to report due to darkness, low visibility, or because ship is more than .5 nm from ice edge.
AIV-18
