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Extended Outlook

2200 UTC Sunday 24 July to 2200 UTC Wednesday 27 July 2016
Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 222134 UTC

Cullercoats

During Sunday evening, a slack area of high pressure will be centred 1021 over the Baltic Sea, extending across much of eastern Cullercoats. At the same time, a large area of low pressure will be centred 1009 to the northwest of the UK. High pressure will also dominate the area to the southwest, around the Azores. During Monday, the low pressure to the northwest of the UK will move northeast, to be centred 1005 to the northeast of the Faeroes by midnight. At the same time the high pressure across Scandinavia will sink into continental Europe. This pattern persists during Tuesday and Wednesday, however a second low pressure will move east, to be centred 1008 to the west of Ireland by midnight Tuesday and during Wednesday. Winds are expected to generally remain light, but could occasionally turn strong across Fair Isle during Monday, and through Forties and Viking at times through the entire period

Niton

During Sunday evening, high pressure will be centred 1030 to the west of Niton, across the Azores, with a slack pressure pattern across continental Europe. Low pressure will be centred to the northwest of the UK, whilst a shallow low pressure, will be centred across the Iberia peninsular. During Monday, very little change occurs, although the high pressure to the west will build slightly, with a weak ridge amplifying into France. This pattern persists during Tuesday and Wednesday, although a second low pressure will develop and move east in the Atlantic, to be centred 1008 northwest of Shannon by midnight Tuesday and during Wednesday. Generally light winds are expected through the period, although some occasional strong winds are possible across southern Fitzroy through the period. Some strong winds are also possible across Shannon on Tuesday and Wednesday as low pressure develops to the west

Portpatrick

During Sunday evening, a large slack area of low pressure will have centres 1009 across Bailey and 1007 Southeast Iceland, and extend across Portpatrick. Further small low centres are likely elsewhere. A weak high pressure system will be across Scandinavia, whilst high pressure will also dominate to the south around the Azores. During Monday, a new low centre is expected to develop, moving northeast in the area of slack low pressure, to be centred 1005 to the northeast of the Faeroes by midnight. At the same time a ridge of high pressure will amplify from the Azores into France. This pattern then persists during Tuesday and Wednesday, however a second low pressure will move east, to be centred 1008 to the west of Rockall by midnight Tuesday and during Wednesday. Generally light winds expected, but these could be occasionally strong across Faeroes and Fair Isle during Monday, and then across Shannon and south Rockall on Tuesday and Wednesday

Extended outlook overview

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

For the extend 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.

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