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Weather warnings may have been issued

Extended outlook

2000 UTC Saturday 20 January to 2000 UTC Tuesday 23 January 2018

Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 182046 UTC


During Saturday evening an area of low pressure 997 is expected to lie near Denmark and this will move away east during Sunday. During Sunday a deep low pressure area 965 will develop near Iceland with fronts crossing Ireland, then Britain. These fronts will move across the North Sea early on Monday. Another low may affect far southern waters of Cullercoats on Monday, but confidence is low for detail. Another set of fronts looks set to cross the North Sea during Tuesday, with another low expected Norwegian Sea 982 by midday. Southerly gales are expected to reach Fair Isle by midday Sunday then extend to waters north of 55 north, with possible severe gales affecting Viking and North Utsire. Winds generally decreasing by Monday morning. Westerly gales may affect some northern waters during Tuesday, mainly north of 55 north, then probably decreasing again by evening


During Saturday evening an anticyclone is expected to be centred Trafalgar 1034 with a low centred southern Germany 994. This low will move away east, with fronts over Shannon moving across Ireland then Britain. These fronts will move away eastwards with an Atlantic low expected Shannon 1002 by midnight. There is low confidence for the details of this low but it looks set to move east across southern England 999 by midday Monday then perhaps across the Low Countries by evening. By midday Tuesday the high over Trafalgar 1033 is expected to extend a broad ridge of high pressure across Biscay and southern France. Westerly gales may affect Biscay at first on Saturday night, with further gales affecting Shannon by Sunday morning. These westerly or southwesterly gales may extend east to affect some English Channel waters for a time on Sunday, with further gales or severe gales north of 45 north on Monday, then decreasing by Tuesday morning


A deep Atlantic low is expected to become centred 300 miles south of Iceland 965 by midday Monday, with fronts affecting most waters of Portpatrick. The low is expected to become complex with a centre near Bailey 977 by midday Tuesday, before moving further northeast across Norwegian Sea 982 by midday Tuesday. A ridge of high pressure then following across most waters of Portpatrick. Gales are expected to develop on Saturday night and into Sunday across all waters. On Monday further gales are likely across most waters, with severe gales probably mainly affecting Shannon, Bailey and Southeast Iceland. During Tuesday winds will probably generally decrease again with gales becoming confined to Hebrides and Fair Isle by the end of the morning, and then decrease to strong for the afternoon. Further gales amy reach far western waters of Portpatrick by Tuesday evening

Marine weather extended outlook for the next 3 to 5 days

The extended outlooks are issued once a day, at 2300 GMT and cover the next 3 to 5 days.

For the extended 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.

Caution: The internet is not part of the Maritime Safety Information system and should never be relied upon as the only means to obtain the latest forecast and warning information. Access to the service may be interrupted or delayed from time to time, updates may also be delayed. Please refer to GMDSS services, INMARSAT SafetyNET or international NAVTEX for the latest information. When using these web pages, always check that the page on your screen is not from your cache. Use the Refresh or Reload button if in any doubt.

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