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Extended Outlook

Extended outlook forecast

Issued: 2027 on Thu 21 May 2015 UTC

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

Valid from 2100 on Sat 23 May 2015 UTC until 2100 on Tue 26 May 2015 UTC

Cullercoats

On Saturday evening an anticyclone will be centred over sea area Thames with a ridge of high pressure extending northwards across North Utsire. On Sunday the area of high pressure will move to northern Germany and Poland with troughs crossing the Cullercoats area. By Monday an anticyclone will be centred north of the Azores with a broad ridge extending northeastwards across the United Kingdom and little change is expected into Tuesday with weak troughs crossing the North Sea from the west and northwest. On Saturday night strong southerly veering westerly winds will cover most northern waters of the North Sea. Westerly gales may affect Fair Isle for a time on Sunday afternoon, before decreasing again during the evening. On Monday strong westerly or northwesterly winds will continue to affect northern waters and on Tuesday morning may reach gale strength again for a time across the waters of Fair Isle, and possible Viking as well during the afternoon and evening period

Niton

On Saturday evening an anticyclone will be centred just northwest of the Azores with a ridge of high pressure extending eastwards towards southern England, with another anticyclone centred over sea area Thames which will move to northern Germany overnight. On Sunday and Monday the first anticyclone will be centred north of the Azores with a broad ridge extending northeastwards across the United Kingdom and little change is expected into Tuesday with weak troughs crossing the North Sea from the west and northwest. During this period pressure will be relatively low across Iberia.

Portpatrick

On Saturday evening an anticyclone will be centred just northwest of the Azores with a ridge of high pressure extending eastwards towards southern England and this pressure pattern will persist from Sunday through to Tuesday evening. Further north a complex low will be centred near western Iceland 991 on Saturday evening, and this low will move to just northeast of Iceland 992 by Sunday afternoon. On Monday the low will fill and become centred northeast of the Faeroes 1002 by midday then move to the Norwegian Sea by Tuesday with a trough extending southwestwards to Iceland.

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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