S411 Alaska_ ice chart quicklooks

The ice chart previews are made with a short python script. The scripts are running independently from the S411 production, therefore previews may be older than the S411 data itself. The standard S411/WMO portrayal is used for concentration and stage of development.The navigational portrayal is based on the POLARIS system. For each individual ice class the colors indicate:

ligth green

easy ice conditions (RIO>10)

green

light ice conditions (10>RIO>5)

yellow

normal ice operation (5>RIO>0)

orange

elevated operational risk (0>RIO>-10)

red

special consideration (normally No-Go) (RIO<-10)