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Extended outlook

2100 UTC Wednesday 13 December to 2100 UTC Saturday 16 December 2017

Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 112150 UTC

Cullercoats

Wednesday evening a large low complex north of the British Isles, with a strong west to northwest circulation on its southern flank. Through the period the main low complex is expected to transfer eastwards into Scandinavia, with a secondary smaller low centre moving southeast across western parts of the UK Thursday and Friday. This will generate a strong north to northwest airflow across the region Friday and Saturday. South of 55n strong to gale force winds are expected to extend eastwards Wednesday night. Thursday occasional gales across the English Channel, with a low risk of isolated severe gales. Overnight strong to gale force winds arrive across Fair Isle, while winds ease elsewhere. Friday strong to gale force winds are likely to extend southwards across much of the North Sea, while strong winds also return to the English Channel. Saturday gales gradually abate, leaving strong winds across much of the North Sea, and light winds for the English Channel

Niton

On Wednesday evening a large low complex is located to the north of the British Isles with a strong west to northwest circulation on its southern flank. Through the period the main low complex is expected to transfer eastwards into Scandinavia, with a secondary smaller low centre moving southeast across western parts of the British Isles during Thursday and Friday, and this will allow a strong northwest airflow to spread across all regions on Friday and Saturday. Wednesday evening widespread gale or near gale force winds are expected across the north of Niton region, mainly north of 48 north. Thursday winds may increase to locally severe gale at times across the north of the region, with gales likely to extend a little further south across Biscay and northern Fitzroy. Strong to gale force winds continue into Friday across much of Niton, before gradually moderating from the west on Saturday

Portpatrick

On Wednesday evening a large low complex is located to the north of the British Isles with a strong west to northwest circulation on its southern flank. Through the period the main low complex is expected to transfer eastwards into Scandinavia, with a secondary smaller low centre moving southeast across western parts of the British Isles during Thursday and Friday, and this will allow a strong northwest airflow to spread across all regions on Friday and Saturday. Wednesday night widespread strong to gale force winds are expected for much of the Portpatrick region, except the perhaps far north at first. Thursday, winds may increase to severe gale in places for a time across the southern half of Portpatrick, with strong to gale force winds likely further north. Friday winds gradually moderate from the west, with no strong winds or gales currently forecast across the region during Saturday

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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