Close window
Weather warnings may have been issued

Extended outlook

2100 UTC Monday 20 November to 2100 UTC Thursday 23 November 2017

Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 182119 UTC

Cullercoats

On Monday evening, slack flow is expected, with shallow low centred 1005 German Bight. High pressure will be centred to the south, with a ridge across western UK. A trough also extends from Iceland to northeast Scotland, moving southwest, with low pressure also centred west of the UK. The low moves northeast to be centred 990 northwest Scotland by midday, then deepens to 980 by midnight. During Wednesday a further low move moves into Ireland, as low across Scotland moves northeast into Norwegian Basin. Through Thursday, the low in the Norwegian Basin deepens further, with a trough extending southeastwards, across the UK and towards the Azores. A number of shallow low pressure centres are possible along the trough. Winds becoming strong across north and northeast Cullercoats during Tuesday, with gales likely, perhaps isolated severe gales in the far north. Winds then strengthen across southern Cullercoats overnight into Wednesday, with isolated gales. Isolated gales likely south of 56N on Thursday

Niton

On Monday evening, high pressure will dominate across Niton, centred across southeast Europe, with a ridge across west UK. A shallow low will be centred 1005 northeast of Niton, with low pressure also centred west of Niton, in the Atlantic. This Atlantic low moves northeast to be centred 990 northwest Scotland by midday, with high pressure declining into Europe. During Wednesday a further low move moves into Ireland, as the low across Scotland moves northeast into Norwegian Basin. During Thursday a trough extends southeastwards, from this low, across the UK and towards the Azores. A number of shallow low pressure centres are possible along the trough. Winds becoming strong across west Niton during Tuesday and Wednesday with isolated gales possible, most likely Plymouth, Biscay, Sole. These continue east Thursday, whilst further isolated gales move into Lundy, Fastnet, Shannon. These then easing Thursday

Portpatrick

On Monday evening, a trough extends southeast from Iceland, through the North Sea, with a ridge across western UK, and Low pressure centred in the Atlantic. This Atlantic low moves northeast, becoming centred 990 northwest Scotland by midday, then deepening to 980 by midnight. During Wednesday low centred moves into Ireland, whilst low near Scotland moves northeast into Norwegian Basin. Through Thursday, this low likely deepens further, with a trough extending southeastwards towards the Azores. A number of shallow low pressure centres develop along the trough. Gales likely across Rockall, Hebrides, Bailey, Fair Isle Tuesday morning, then extending to areas north of 59N by midnight, perhaps severe in the far north. These extend across all Portpatrick Wednesday, with low risk of isolated storm force winds north of Low centre. These easing overnight, however further gales possible across Shannon, Rockall Thursday, and persisting across South East Iceland. Further gales to severe gales possible across northeast Portpatrick Friday

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.

Follow us on

Facebook, Twitter, YouTube, Instagram, or Snapchat Facebook Follow @metoffice on Twitter YouTube Instagram Snapchat