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yellow Warnings have been issued for the United Kingdom

Extended Outlook

2200 UTC Monday 23 January to 2200 UTC Thursday 26 January 2017
Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 212200 UTC

Cullercoats

On Monday evening, high pressure will be centred 1031 across southern England, ridging north across Scandinavia and into the Norwegian Basin. Any low pressure centres will remain to the west of Cullercoats. This continues on Tuesday and Wednesday, although high pressure will gradually become centred 1033 to the south of the region, across the Netherlands, with a frontal zone pushing into the far northwest. This high pressure will then continue to gradually recede eastwards during Thursday. Winds are expected to be strong across Cromarty and Fair Isle on Monday evening. During Tuesday, strong winds are likely to develop more widely across the northern half of the North Sea, with a risk of gales developing across Fair Isle. These gales could then spread across the rest of the northwest of Cullercoats through the course of Wednesday and Thursday, although the strongest winds will remain most likely across western parts of Fair Isle

Niton

On Monday evening, high pressure will extend from the Canary Islands, to a centre 1031 across southern England. A series of low pressure centres will be centred to west of Niton, with a frontal zone extending across the northwest of the region. During Tuesday and Wednesday, the high pressure will gradually recede to be centred 1033 to the south of the region, across the Netherlands, with a frontal zone remaining into the far northwest. This high pressure will then continue to gradually recede eastwards during Thursday. Strong winds are expected to gradually spread into northwest Niton through Monday. During Tuesday, the strong winds will extend further east into Fitzroy, Sole, Lundy and Irish Sea, with gales developing locally in Sole and Shannon. On Wednesday and Thursday strong winds will extend further east into the west of Biscay and the west English Channel, with gales developing further west

Portpatrick

On Monday evening, high pressure will be centred 1031 across southern England, ridging north across Scandinavia and into the Norwegian Basin. A frontal zone will extend south from Iceland, to the west of the UK. On Tuesday and Wednesday the high pressure will gradually become centred 1033 to the south of the region, across the Netherlands, whilst a filling Atlantic low pressure moves north to the west of Portpatrick, as the frontal zone gradually moves east. The high pressure will continuing receding eastwards during Thursday, with the frontal zone moving into the northwest of the UK. Strong winds are expected to gradually spread into the west and north of Portpatrick by Monday evening with local gales developing in the far west. Similar conditions for Tuesday, but strong winds developing widely across Portpatrick by Wednesday, and increasing to gale or near gale force in many areas through the day Winds will ease in the far west through Thursday

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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