Incidental hydrometeorological observations along vessel routes. Monitoring and forecast of the surface layer atmosphere state, hydrometeorological support of safety of navigation and marine activities.
• air temperature, • air humidity, • type and amount of clouds, • atmosphere pressure, • wind structure, • visual range • hydrometeorological phenomena, • characteristics of ice accretion, • wave height and direction, • water temperature near the surface. Observations – every 4 or 6 hours