5 Day Atlantic Forecasts
Pressure: Isobars, lines of equal atmospheric pressure, are drawn every 4hPa (hectopascals or millibars). Areas of High and Low pressure are indicated. The closer the spacing of the isobars, the stronger the wind.
Rainfall:Precipitation rate in mm/h averaged over the previous 6 hours. Blue shades show light rain while yellow and red show heavy rain. Precipitation can be rain, hail or snow.
Temperature: Surface temperature predictions over land and sea. Temperatures less than -20°C are shown as white.
Wind: Wind strength in knots (nautical miles per hour) is indicated by the coloured areas. The colours correspond to Beaufort forces (Gale Force, or Beaufort Force 8, is equivalent to 34 knots). Wind direction and strength are indicated by the arrows.
Cloud: Computer generated simulated satellite images. Information displayed is total cloud cover and is similar in appearance to visible satellite imagery.
Wave: Significant wave height in metres is illustrated by the coloured areas. Wave direction is shown by the arrows. Data shown are total wave height which is the sum of sea (wind driven waves) and swell (waves from distant storms). Note: The White shade means No data.
General: The information presented here is derived from Numerical Weather Prediction (NWP) models used in Met Eireann as forecaster guidance. Information for up to 5 days ahead comes from the ECMWF model, presented at 6-hourly intervals. The official forecast may not always reflect the guidance charts illustrated; the forecasters also consider information from satellite, radar and weather observations, in addition to the application of their own experience.
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Times indicated in forecasts and reports may be local or UTC.