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Extended Outlook

Extended outlook forecast

Issued: 2204 on Sat 24 Jan 2015 UTC

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

Valid from 2200 on Mon 26 Jan 2015 UTC until 2200 on Thu 29 Jan 2015 UTC

Cullercoats

Monday evening, a ridge of high pressure lies to the southwest of the UK. A deep area of low pressure, 973, is slow moving over Iceland. During Tuesday the anticyclone will begin to slowly decline south-westwards. Leaving broadly westerly flow across Cullercoats. The weak influence of the ridge will last until Wednesday morning, when a developing low, centred north Viking 974 at midday, moves eastwards and deepens to be centred over Norway, 959, by the end of the period with associated pressure trough across most of the region. On Monday evening strong west or north-westerly winds will extend across most of Cullercoats, except Dover, Wight and Thames. These strong winds will persist throughout the period briefly strengthening to gale force in Fair Isle over Tuesday night and in Humber over Wednesday night. During Thursday the winds will veer north-westerly or northerly and ease in all areas except Fair Isle, where northerly gales are likely, and Thames where they will become strong

Niton

Monday evening, a ridge of high pressure lies to the southwest of the UK centred west of Fitzroy, 1040. This anticyclone extends across the whole of Niton. During the period it will decline slowly as deep areas of low pressure to the north of the UK move eastwards into Norway causing the westerly flow across Niton to veer north-westerly later on Wednesday into Thursday. At first no hazardous winds will affect Niton, however during Tuesday strong south-westerly winds will develop over Shannon and Sole before they extend eastwards into Plymouth, Portland, Lundy, Fastnet, and Irish Sea. During Wednesday westerly gales will develop across Lundy, Fastnet and Shannon and, on Thursday while veering north-westerly, Sole, Northeast Fitzroy and Biscay. Strong winds will persist in all other Niton sea areas

Portpatrick

Monday evening, a ridge of high pressure lies to the southwest of the UK. A deep area of low pressure, 973, is slow moving over Iceland. During Tuesday the anticyclone will begin to slowly decline south-westwards. Leaving broadly westerly flow across Portpatrick. The weak influence of the ridge will last until Wednesday morning, when a developing low, centred north Viking 974 at midday, moves eastwards and deepens to be centred over Norway, 959, by the end of the period with associated pressure trough across most of the region. From Monday evening strong westerly winds will affect most of Portpatrick, except sea areas Lundy, Fastnet, Irish Sea and Shannon. However, during Tuesday strong south-westerly winds will develop over Shannon and Sole before they extend eastwards into Lundy, Fastnet and Irish Sea. During Wednesday westerly gales will develop across Lundy, Fastnet, Shannon, Rockall, Malin, Hebrides, Bailey and briefly in Fair Isle. During Thursday, while veering north-westerly or northerly, they will extend northwards into Faeroes and Southeast Iceland and eventually the whole of Fair Isle.

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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