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