Weather Layer on Live Map

The Weather Maps layer on the Live Map will provide you with 23 weather layers which will help you ensure the safety of a vessel and her crew, as well as being able to optimise a vessel’s sailing routes forecast. 

In this article, you will learn about how you can make use of the Weather layer and all the functionalities that come with it through the following:

Enable Weather Layer

In order to enable the weather layer on the Live Map, you can click on the wind icon on the Live Map ToolBar as shown below:Weather_Maps.png

Weather Layer and Route Forecast

If any layer of the Weather Maps is enabled, as well as the Route Forecast option, you will be able to move the weather maps timeline slider, and a ghost vessel will be shown at the expected position of the vessel at each time-step.

Route_forecast_gif.png

 

Sea Meteogram

The Sea Meteogram is a pop up that will appear as soon as you click on any sea area on the Live Map. There you can find a handful of useful information, in the form of straightforward graphs, such as the wind speed, the wave height and wave period in the area selected.Sea_Meteogram.png

 

Types of Weather Layer

Now, let's take a closer look at the different layers that you can use with Weather:

1. Wind Barb

By default, the first option when you enable the Weather Maps layer is Wind barbs.

Note: All registered MarineTraffic members have access to the Wind barbs layer, as well as a 24-hour wind forecast. However, members that have purchased the Weather Maps Service can get wind forecasts for up to 72 hours!

Once you have activated the Wind barbs option and have selected your desired wind forecast time-frame, wind barbs will appear on the Live Map.weather_maps.png

Note II: Same with the vessel icons, you may need to zoom in enough in order to be able to see them.

The wind barbs have different colours and point to different directions. This way you are instantly able to get a picture of the overall wind conditions in any given area.

In the picture below, you can see the respective wind speed values in knots (1 knot = 1.15mph) new_sprite_wind_1st_line.jpg

The direction the barb is pointing to, denotes the wind direction.

For example, the barb that is shown below represents a 35kn NE wind.ne_wind.png

 Spend some time getting accustomed to this feature and you will be able to easily identify wind conditions in no time!

Note III: Wind forecasts are model-based and not real-time observations sent by the ships. The maximum resolution of the weather data is 0.2 degrees (approximately 12 NM). 

Below you can find the knots conversion to the Beaufort scale and other wind speed-related information.


Beaufort Wind Force Scale - Specifications and Equivalent Speeds

The lag effect between the wind getting up and the sea increasing should be borne in mind.

*These values refer to well-developed wind waves of the open sea.beauffort_scale.PNG

Source: Met Office

2. Wind (Speed & Direction)

This layer combines 2 important pieces of information, the wind speed and the wind direction. The different colours on the map represent the speed measured in kn (Knot) while the wind direction is represented by an arrow pointing to the direction to which the wind blows.Wind.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the kn.

3. Wind flow

This layer combines the same information as the previous one. However in this case the wind direction is represented by an arrow that provides a more accurate and specific representation of the direction.Wind_flow.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the kn.

4. Wind gust

This layer displays the speed of wind gusts at 10 m above ground. It is expressed in kn (Knot) and visualised with colours. Wind_gust.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the kn.

5. Wave height-direction

This layer combines 2 important pieces of information, wave height and the wave direction. The different colours on the map represent the height measured in m (Metre) while the direction is represented by an arrow pointing to the direction.Wave_height_-_direction.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the m.

6. Wind wave height

This layer displays the wind waves, with different colours on the map that represent the height measured in m (Metre). Wind waves are defined as surface waves that occur on the surface of bodies of water and are caused by the local wind.Swell_Height.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the m.

7. Wind wave period

This layer displays the time period of wind waves with different colours on the map that represent the time measured in s (Second). More specifically, the period of wind waves is the time in seconds between two waves.Wind_wave_period.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the s.

8. Currents

This layer displays the ocean currents, with different colours on the map that represent their speed measured in kn (Knot) and arrows that show the direction.Current.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the kn.

9. Swell height

This layer displays the swell waves, with different colours on the map that represent the height measured in m (Metre). Swells waves are generated by wind associated with the oceans, and have travelled long distances.Wind_wave_height.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the m.

10. Swell period

This layer displays the time period of swell waves with different colours on the map that represent the time measured in s (Second). More specifically, the period of swell waves is the time in seconds between two waves.Swell_period.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the s.

11. Visibility

This layer displays the distance at which an object can be clearly seen. This horizontal visibility is visualised with colours measuring in m (Metre).visibility.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the m.

12. Temperature

This layer displays the temperature at the indicated time. Like all temperature layers, it is expressed in degrees °C (Celsius) and visualised with colours.Temperature.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the °C.

13. Max. temperature (last 24 h)

This layer displays the highest temperature that occurred in the last 24 hours. Like all temperature layers, it is expressed in degrees °C (Celsius) and visualised with colours.Max._temperature__last_24_h_.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the °C.

14. Min. temperature (last 24 h)

This layer displays the lowest temperature that occurred in the last 24 hours. Like all temperature layers, it is expressed in degrees °C (Celsius) and visualised with colours. Min._temperature__last_24_h_.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the °C.

15. Clouds & Precipitation 3h

This layer combines 2 important pieces of information, the cloud cover and the precipitation in the indicated time period of 3 hours. Precipitation is displayed with colours, while the clouds are shaded in gray, in accordance with the density.Clouds___Precipitation_3h.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the mm.

16. Cloud cover (density)

This layer displays the density of the cloud cover. Grey means denser, while white means less dense.

There is no metric bar for this layer.Cloud_cover__density_.png

17. Precipitation 3h

This layer displays the precipitation within the indicated time period of 3 hours. Precipitation is the deposition of water to the Earth's surface, in the form of rain, snow, ice or hail. All precipitation quantities are expressed in mm (Millimetre) that is here displayed with colours.Precipitation_3h.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the mm.

18. Precipitation probability

This layer displays the probability of precipitation amounts greater than 0.1 mm. The probability is shown by colours in % (Percentage) and can be defined as the frequency with which precipitation occurs, in this case in 20 different forecast calculations that provide the final estimation.Precipitation_probability.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the %.

19. Snowfall (last 24h)

This layer displays the total amount of fallen snow accumulated on the surface in the last 24 hours. It is expressed in cm (Centimetre) and visualised with colours. Snowfall__last_24h_.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the cm.

20. Relative humidity

This layer displays the relative humidity in % (Percentage) and is visualized with colours. The relative humidity describes the amount of water that is carried by the air, and it affects the development of clouds and precipitation.Relative_humidity.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the %.

21. Risk (last 24h)

This layer displays the division of weather related risk conditions of the previous 24 hours. Each of this weather event is visualised with a specific colour:

  • Frost - Danger of frost is displayed by a blue surface on the map.
  • Wind - The 3 different levels for wind risk are represented in different colours on the map. Yellow are gusts of wind with a speed of over 50 km/h, orange is gusts of wind with a speed of over 70 km/h and red is gusts of wind with a speed of over 115 km/h.
  • Precipitation - The 3 different stages for precipitation risk are represented in different colours on the map and are measured in mm. Yellow means that the precipitation is greater than 50 mm, orange that is greater than 70 mm and finally red that is greater than 90 mm.
    Risk__last_24h_.png

22. Sea level pressure

This layer displays the air pressure at sea level in hPa (Hectopascal), visualised with isobars and colours. Air pressure affects a number of natural phenomena, such the oxygen availability, cloud formation and thunderstorms.Sea_level_pressure.pngThe metric bar in this layer (right hand side) shows the colour variation that indicates the hPa. 

23. Tropical Storm

This layer will show you all the current storms around the Globe, their intensity, range and dates. You may also see the meter on the right hand side which indicates the Peak gust and the symbols used to represent the storm on this layer. pasted_image_0.png

-Available with the Weather Maps service-