2100 UTC Friday 24 February to 2100 UTC Monday 27 February 2017
Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 222159 UTC
On Friday evening, high pressure centred in the Bay of Biscay will be ridging northeast into the southern half of Cullercoats. A deep low pressure system, will be centred 959 off the southwest coast of Iceland. Through Saturday morning this ridge migrates away east and a warm front will move through Cullercoats. A cold front then follows, moving across the area during the afternoon and evening. A weak ridge of high pressure will then build across the UK and Cullercoats on Sunday, whilst various shallow low pressure systems could develop to the north and west of the UK. During Monday, there is then the potential for one of these features to track northeast across Scotland. Gales are likely north of 57N on Friday evening and Saturday, perhaps severe across Fair Isle, Viking and North Utsire, and strong winds elsewhere. Gales also possible later Sunday and during Monday north of 55N, with a risk of further occasional severe gales
On Friday evening, high pressure centred in the Bay of Biscay will be ridging northeast across much of Niton. A deep low pressure system, will be centred 959 off the southwest coast of Iceland. Through Saturday morning the ridge migrates away east, however a cold front will move across the northwest of the region through the morning. A weak ridge of high pressure will then build across Niton and the UK on Sunday. However shallow low pressure systems could develop to the west of the UK, perhaps affecting the far northwest of Niton. During Monday, there is the potential for one of these features to track further southeast through Sole and Shannon. Gales are likely across Shannon, and northwest Sole Saturday. These extending east Sunday morning, into Fastnet, Irish Sea, Lundy and Plymouth before easing. Further gales are then possible across northwest Shannon overnight into Monday, before more widespread gales become possible west of 03W, perhaps occasionally severe
On Friday evening, low pressure will be centred 959 southwest of Iceland. A warm front will extend from South East Iceland to Malin, clearing northeast overnight. A cold front follows, moving across Portpatrick Saturday morning, with a weak ridge building across the UK and much of Portpatrick by midngiht. However an Atlantic low is also expected to develop southwest of Iceland, moving east. Various shallow low centres could also develop to the north and west of the UK. One feature is likely Sunday, developing near Rockall and moving north. During Monday there is then potential for a further feature to develop across Shannon and track northeast across Scotland. Severe gales, occasionally storm force winds, are possible across southeast Iceland and Faeroes Friday evening, with gales west of 2W. Further gales are likely across Portpatrick Saturday, and also near the system moving north Sunday. Gales are also likely Monday south of 55N, and also Fair Isle later
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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