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Extended outlook

2100 UTC Thursday 19 October to 2100 UTC Sunday 22 October 2017

Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 172022 UTC

Cullercoats

On Thursday evening an extended area of low pressure is expected to lie to the west of the British Isles, with a smaller but more intense low to the south at this time, centred over St George's Channel. Meanwhile high pressure lies to the north-east extending south into central Europe. The smaller low is expected to track across southern England and into the North Sea through Friday, but as a weakening feature. Meanwhile a new, intense low approaches from the south-west and this vigorous low tracks to the south of Ireland and into central Britain by midday on Saturday. This in turn runs into the North Sea by the end of the period, filing as it does so. Strong winds are likely north across much of Cullercoats throughout the period. There is a risk of gales south of low centres, and possible severe gales or storms in Thames, Dover and Wight later Saturday and Sunday

Niton

On Thursday evening an extended area of low pressure is expected to lie to the west of the British Isles, with a smaller but more intense low to the south at this time, centred over St George's Channel. Meanwhile high pressure lies to the north-east extending south into central Europe. The smaller low is expected to track across southern England and into the North Sea through Friday, but as a weakening feature. Meanwhile a new, intense low approaches from the south-west and this vigorous low tracks south of Ireland and into central Britain by midday on Saturday. This in turn runs into the North Sea by the end of the period, filing as it does so. Strong winds or gales are likely across much of Niton through Thursday evening and Friday as the first low moves through the area. Severe gales or storms are possible in association with the second low later Friday and through Saturday

Portpatrick

On Thursday evening an elongated area of low pressure is expected to lie to the west of the British Isles, with a smaller but more intense low to the south at this time, centred over St George's Channel. Meanwhile high pressure lies to the north-east extending south into central Europe. The smaller low is expected to track across southern England and into the North Sea through Friday, but as a weakening feature. Meanwhile a new, intense low approaches from the south-west and this vigorous low tracks to the south of Ireland and into central Britain by midday on Saturday. This in turn runs into the North Sea by the end of the period, filing as it does so. Strong winds are expected across most of Portpatrick through the period. Severe gales, with possible storms, are expected in the south on Saturday with gales further north

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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