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Extended outlook

2100 UTC Tuesday 25 September to 2100 UTC Friday 28 September 2018

Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 232025 UTC

Cullercoats

On Tuesday evening, a large anticyclone 1039, centred near 48 degrees North 15 East, ridges towards Sole. Meanwhile, low pressure 987 centred over Iceland, moves steadily east towards the Norwegian Sea, bringing a frontal trough across northern parts of Britain. Pressure is also rather low over Iberia. By the end of Wednesday, low pressure migrates towards Finland, allowing high pressure to build across central and western Europe. A trough crosses the northern parts of Britain, weakening temporarily the pressure pattern on Thursday. However, high pressure 1035 soon builds from the west and becomes centred over Shannon Friday evening, dominating the whole region. On Tuesday south-westerly gales develop widely to the North of 52 North, these veering westerly Wednesday morning while slowly weakening to occasionally strong later. Some isolated strong westerly winds are also expected Thursday evening, followed by widespread strong north-westerly winds Friday across north and central parts

Niton

On Tuesday evening, a large anticyclone 1039 centred near 48 degrees North 15 degrees east, ridges towards Sole. Meanwhile, low pressure 987 centred over Iceland, moves steadily east towards the Norwegian Sea, bringing a frontal trough across northern parts of Britain. Pressure is also rather low over Iberia. By the end of Wednesday, low pressure migrates towards Finland, allowing high pressure to build across central and western Europe. A trough crosses the northern parts of Britain, weakening temporarily the pressure pattern on Thursday. However, high pressure 1035 soon builds from the west and becomes centred over Shannon Friday evening, dominating the whole region. Easterly winds will be strong in South Fitzroy Tuesday evening, but south-westerly and strong in North Shannon. Some isolated and northerly strong winds are also likely in North Thames Friday evening. Otherwise, no other strong winds are expected during this forecast period

Portpatrick

On Tuesday evening, a large anticyclone 1039, centred near 48 degrees North 15 East, ridges towards Sole. Meanwhile, low pressure 987 centred over Iceland, moves steadily east towards the Norwegian Sea, bringing a frontal trough across northern parts of Britain. Pressure is also rather low over Iberia. By the end of Wednesday, low pressure migrates towards Finland, allowing high pressure to build across central and western Europe. A trough crosses the northern parts of Britain, weakening temporarily the pressure pattern on Thursday. However, high pressure 1035 soon builds from the west and becomes centred over Shannon Friday evening, dominating the whole region. Strong south-westerly winds are therefore widely expected Tuesday evening, somehow weakening to the south Wednesday morning but persisting to the north with near gales in Faeroes and South East Iceland. Winds easing Wednesday evening but further strong winds expected in Rockall and Malin Thursday, followed by Fair Isle, Faeroe and South East Iceland 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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