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Extended outlook

2100 UTC Tuesday 19 June to 2100 UTC Friday 22 June 2018

Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 172038 UTC

Cullercoats

This period is forecast to start with a low lying sea area Rockall 1008. At the same time a ridge of high pressure dominates across much of Cullercoats with an anticyclone centred Wight 1025. The low is then expected to progress across Scotland overnight to be centred by midday Wednesday Forties 1007, with the ridge moving away eastwards. The low will probably then continue east across Norway to reach Sweden 999 by midday Thursday, with another low expected Norwegian Sea 1003. An anticyclone is expected just west of Sole 1035 by this time. By Friday morning low pressure will cover Scandinavia, with high remaining slow moving. Westerly gales may affect Viking and Fair Isle at first on Tuesday night. Thereafter no hazardous conditions are expected across Cullercoats until Thursday evening when northwesterly gales could spread across Fair Isle and then progress across most waters north and east from sea area Humber before then decreasing strong by Friday afternoon

Niton

This period is forecast to start with a low lying sea area Rockall 1008. Another low is expected Iberia 1013. At the same time an anticyclone will be centred Wight 1025. The first low is then expected to progress across Scotland overnight with the anticyclone moving away eastwards. The second low will remain slow moving across Iberia and by midday Thursday an anticyclone is expected just west of Sole 1035, with a broad ridge covering much of Niton. This anticyclone will probably remain slow moving overnight and through much of Friday - the centre perhaps moving closer to sea area Sole. Gales are possible across Shannon at first on Tuesday night. No hazardous conditions are forecast until Thursday morning when possible northerly gales may develop across south Fitzroy. This risk increases through the day and by Friday northerly gales will probably affect waters west of Portugal.

Portpatrick

This period is forecast to start with a low 987 Norwegian Sea, which will move away northeast. Another low is forecast sea area Rockall 1008. This low is expected to progress across Scotland overnight to be centred by midday Wednesday Forties 1007. By midday Thursday an anticyclone is expected just west of Sole 1035, with a ridge extending north to Iceland. Another low is expected Norwegian Sea 1003 by this time. By Friday morning low pressure will cover Scandinavia, with high remaining slow moving and the ridge looks set to move across western waters of Portpatrick during the day. Gales are possible across Shannon and Fair Isle at first on Tuesday night. No hazardous conditions are forecast until Thursday afternoon when northwesterly gales are forecast to move across Fair Isle and Faeroes before decreasing to strong overnight. No hazardous conditions are expected through Friday

Marine weather extended outlook for the next 3 to 5 days

The extended outlooks are issued once a day, at 2300 GMT and cover the next 3 to 5 days.

For the extended outlooks the waters surrounding the British Isles are divided into three areas; Cullercoats, Portpatrick and Niton. These three areas reflect the coverage areas of the UK's Navtex transmitters, which overlap in some areas.

The extended outlook forecast contains details of the likelihood of gales or storms, a general synopsis and a general forecast for the area of coverage of each Navtex transmitter.

 

In the UK, the Maritime & Coastguard Agency (MCA) is responsible for the provision of Maritime Safety Information (MSI) to ships at sea, which includes the broadcast of warnings and forecasts. The Met Office initiates warnings and prepares routine forecasts for dissemination on behalf of the MCA.

Caution: The internet is not part of the Maritime Safety Information system and should never be relied upon as the only means to obtain the latest forecast and warning information. Access to the service may be interrupted or delayed from time to time, updates may also be delayed. Please refer to GMDSS services, INMARSAT SafetyNET or international NAVTEX for the latest information. When using these web pages, always check that the page on your screen is not from your cache. Use the Refresh or Reload button if in any doubt.

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