Coast and sea

Extended outlook

Issued at: .

For the period to .

Extended outlook map

Cullercoats

Tuesday evening, a deepening area of low pressure, 963, will lie centred South East Iceland before moving northeastwards into the Norwegian basin early Wednesday, but remain close to Iceland during the period. This depression maintains a predominantly westerly flow across the UK. A small, vigorous low is likely to develop over the north of the UK during Wednesday, to be centred Fair Isle midday Wednesday, 972. This low will then move quickly northeast on Thursday. Meanwhile, a ridge of high pressure will amplify as it moves eastwards to be centred western Fitzroy Thursday midday, 1030. Strengthening winds are likely to develop and spread north-eastwards on Wednesday, with gales becoming widespread for a time, probably severe in the north. Winds should gradually ease later Wednesday and into Thursday, but still strong to near-gale. Friday, winds still generally strong, locally near gale in places

Niton

Tuesday evening, a deepening area of low pressure, 963, will lie centred South East Iceland before moving northeastwards into the Norwegian basin early Wednesday, but remain close to Iceland during the period. This depression maintains a predominantly westerly flow across the UK. A small, vigorous low will likely develop over north UK Wednesday, to be centred Fair Isle midday Wednesday, 972. This low moving quickly northeast on Thursday. Meanwhile, a ridge of high pressure builds as it moves eastwards to be centred western Fitzroy Thursday midday, 1030. A swathe of strengthening winds is expected to arrive across Shannon Tuesday evening, before transferring eastwards on Wednesday across much of Niton, except Biscay and southern Fitzroy. Gales are then likely across the north of Niton Wednesday morning, these should gradually ease later but still remaining strong to near-gale. Thursday and Friday, winds still generally strong across north Niton, locally near gale in the north Irish Sea

Portpatrick

Tuesday evening, a deepening area of low pressure, 963, will lie centred South East Iceland before moving northeastwards into the Norwegian basin early Wednesday, but remain close to Iceland during the period. This depression maintains a predominantly westerly flow across the UK. A small, vigorous low will likely develop over north UK Wednesday, to be centred Fair Isle midday Wednesday, 972. This low will moving quickly northeast on Thursday. Meanwhile, a ridge of high pressure will amplify as it moves eastwards to be centred western Fitzroy Thursday midday, 1030. A swathe of near gales or gales is expected Tuesday evening across Southeast Iceland and perhaps Faeroes, clearing Portpatrick into the Norwegian Basin overnight Tuesday. Strengthening winds likely to develop and spread north-eastwards on Wednesday, with gales becoming widespread for a time, severe in places. Winds gradually ease later Wednesday and into Thursday, but still strong to near-gale. Friday, winds still generally strong, locally near gale in places

The extended outlook information

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.

Marine forecasts disclaimer

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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