Forecast Help

  • North Sea Forecast Navigation Map.
    • The Map in the Inset Box covers the Forecast Area. To select an area, either click on a location in the inset box or move the small Detail Area box across the map. As the box is moved the Zoom Detail Area will move in the larger map.
    • To activate a Forecast Area. Click on a location on the Zoom Detail Area Map. This will activate the forecast in the Forecast Graph area.
    • The Forecast Areas from the Click Map are at increments of 30min Lon and 1Deg Lat.
    • Use the Next Area buttons to move to the next forecast Area. The forecast area will move 30min east or west of the current area or 30min north or south of the area.
  • N.B. The forecast Navigation Map requires the use of Java and is best viewed in Internet Explorer (IE). It has been tested in Internet Explorer, Firefox and Safari. If you experience Javi issues in other browsers I would welcome your feedback.

  • Forecast Wind Speed.
    • Wind Speeds are mean speeds in Knots shown for 2 levels. The standard measuring height of 10 metres above the surface and an additional height of 50 metres above the surface. The 50M level is a good indicator of wind speed at deck level on Oil Rigs etc.
    • 10M Wind is shown as a green line on the graph.
    • 50M Wind is shown as a blue line on the graph.
    • 50M Gusts are shown as a dotted red line on the graph, and are only shown when they are greater than 40Kts

     

  • Printing the Wind Speed Graph
    • Click on the Graph or the Wind Graph button on the left margin.
    • The Graph will open on a new page that can be printed.
    • To see the forecast wind speed value as a number, run the cursor hand across the graph. When it intersects with a line the date/time and value will show.
  • Forecast Wave Heights
    • Wave Heights are in metres, showing the significant and maximum heights as well as the height of any swell and the direction the swell is travelling from.
    • Wave Height is the difference in elevation between the wave crest and the wave trough.
    • Significant Wave Height is the average height of the highest 1/3  of a sample of waves over a ten minute period.
    • Maximum wave Height is the average height of the highest 1% of a sample of waves.
    • Extreme Wave Height is twice the significant height.
  • Printing the Wave Height Graph
    • Click on the Graph or the Wave Graph button on the left margin.
    • The Graph will open on a new page that can be printed.
    • To see the forecast wave height  value as a number, run the cursor hand across the graph. When it intersects with a line the date/time and value will show.
  • Forecast Wave Periods
    • Wave Period is the time interval between the passage of twp successive crests past a fixed point.
    • Wave Periods are in seconds.
    • The green line indicates the period of the wind wave.
    • The blue line indicates the average period of the primary swell.
    • The dotted red line indicates the average wave speed of the combined wind wave and swell.
  • Printing the Wave Height Graph
    • Click on the Wave Period Graph
    • The Graph will open on a new page that can be printed.
    • To see the forecast wave period values as a number, run the cursor hand across the graph. When it intersects with a line the date/time and value will show.