On Thursday evening a ridge of high pressure will extend northwest across southern Scandinavia and the eastern North Sea, with low pressure to the west and southwest of the British Isles. By midnight on Saturday the ridge is expected to have extended west across central and northern parts of the British Isles, but with a cyclonic flow persisting across southwestern areas. Frontal troughs are likely to move east through the far north of the Cullercoats area during Saturday and Sunday, with the ridge persisting across central parts of the North Sea. However, low pressure centred near southern Iberia over the weekend is expected to maintain a cyclonic northeasterly flow through the English Channel. Near gale to gale force winds through Viking, North Utsire, South Utsire, east Forties, and Fisher on Thursday evening will slowly moderate by Friday afternoon. Further gales are likely in Viking and North Utsire on Saturday evening, moderating a little during Sunday
A ridge of high pressure is expected to persist through the central North Sea through much of the forecast period. Low 971 centred just to the northwest of Fitzroy on Thursday evening is expected to move south into Trafalgar by Friday evening, and be slow moving near southeast Spain from midday Saturday, maintaining a cyclonic flow over much of the Niton area through the forecast period. However, a ridge of high pressure is likely to extend northeast through Shannon during Saturday, and across Sole, Lundy, Fastnet, and Irish Sea by midday Sunday. Gale to near gale force winds over north Fitzroy, Sole, and Shannon on Thursday evening will weaken by early Friday. Winds are expected to increase to near gale or gale force in south Biscay by midnight Friday, but then moderate again during Friday afternoon. Further near gale force winds may develop in south Fitzroy by Sunday evening
On Thursday evening a ridge of high pressure will extend northwest from the Norwegian Basin to Iceland, with low pressure extending southeast through the Atlantic East Northern and East Central Sections. By midday Friday the ridge is expected to extend west across central and northern parts of the British Isles, and across the Portpatrick area over and to the north of Rockall and Malin, but with a cyclonic flow persisting to the south. During Saturday and Sunday the ridge is expected to move south into southern parts of the Portpatrick area, allowing frontal troughs to move east through northern areas. Near gale to gale force winds through Shannon and Rockall on Thursday evening will moderate by the early hours of Friday. Further gales are expected to spread east into Bailey and Southeast Iceland on Saturday evening, becoming confined to Southeast Iceland by Sunday morning, then moderating by early afternoon
Extended outlook overview
The extended outlooks are issued once a day, at 2300 GMT and cover the next 3 to 5 days.
For the extend 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.
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