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Surface pressure charts

  • 1200 on Thu 30 Oct 2014

    Analysis chart

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Analysis chart
  • 1200 on Mon 03 Nov 2014

    Forecast chart T+12

    Issued at: 1200 on Wed 29 Oct 2014

    Surface pressure - Forecast chart T+12
  • 0000 on Fri 31 Oct 2014

    Forecast chart T+12

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+12
  • 1200 on Fri 31 Oct 2014

    Forecast chart T+24

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+24
  • 0000 on Sat 01 Nov 2014

    Forecast chart T+36

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+36
  • 1200 on Sat 01 Nov 2014

    Forecast chart T+48

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+48
  • 0000 on Sun 02 Nov 2014

    Forecast chart T+60

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+60
  • 1200 on Sun 02 Nov 2014

    Forecast chart T+72

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+72
  • 1200 on Sun 02 Nov 2014

    Forecast chart T+96

    Issued at: 1200 on Wed 29 Oct 2014

    Surface pressure - Forecast chart T+96
  • 1200 on Thu 30 Oct 2014

    Analysis chart

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Analysis chart
  • 1200 on Mon 03 Nov 2014

    Forecast chart T+120

    Issued at: 1200 on Wed 29 Oct 2014

    Surface pressure - Forecast chart T+120
  • 0000 on Fri 31 Oct 2014

    Forecast chart T+12

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+12
  • 1200 on Fri 31 Oct 2014

    Forecast chart T+24

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+24
  • 0000 on Sat 01 Nov 2014

    Forecast chart T+36

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+36
  • 1200 on Sat 01 Nov 2014

    Forecast chart T+48

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+48
  • 0000 on Sun 02 Nov 2014

    Forecast chart T+60

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+60
  • 1200 on Sun 02 Nov 2014

    Forecast chart T+72

    Issued at: 1200 on Thu 30 Oct 2014

    Surface pressure - Forecast chart T+72
  • 1200 on Sun 02 Nov 2014

    Forecast chart T+96

    Issued at: 1200 on Wed 29 Oct 2014

    Surface pressure - Forecast chart T+96
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Surface pressure charts showing pressure and weather fronts are provided for up to five days ahead for Europe and the North West Atlantic.

These charts show the surface pressure pattern using isobars (lines of equal pressure) and indicate areas of high (H) and low pressure (L) along with their central pressure value. Isobars are represented by solid lines. High pressure is usually associated with settled weather while low pressure is normally associated with unsettled weather. Fronts are also displayed.

An analysis chart, which shows the observed state of the weather, is issued along with forecast charts out to five days ahead. These are updated every 12 hours around 0730 and 1930, with the exception of charts for days four and five which are only issued once per day at 1930. The reason that these two charts are only issued once a day is because that far ahead the forecast surface pressure pattern will change more significantly, due to uncertainty at this longer time period, and there is limited value in updating it every 12 hours.