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Extended Outlook

2100 UTC Thursday 30 March to 2100 UTC Sunday 2 April 2017
Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 282032 UTC

Cullercoats

On Thursday evening a complex area of low pressure centred over Atlantic to west of Ireland 989 is expected Shannon 998 by midday Friday with high pressure covering the near continent. By midday Saturday the low is expected to relax northwards as a trough lying Shetland Isles to Wight. The trough will then move eastwards across Cullercoats overnight with a broad ridge of high pressure following and covering the UK by Sunday morning with an anticyclone centred Biscay 1031 by midday. This ridge of high pressure is then expected to move further eastwards to cover most of Cullercoats. On Tuesday night occasional strong winds will affect some waters but will tend to ease by Friday. Little change is then expected with further strong winds at times into Saturday, mainly affecting northern waters. Winds are then expected to generally ease further during Sunday

Niton

On Thursday evening a complex low centred Atlantic to west of Ireland 989 is expected Shannon 998 by midday Friday with relatively high pressure covering Iberia and France. This complex low pressure is then expected to transfer away northeastwards across northern areas of the UK, although a secondary low may move from Shannon to reach northern Biscay 1013 by midday Saturday. By this time an anticyclone is expected just west of Trafalgar 1029, with a ridge extending northwards. Pressure looks set to continue building across Niton with an anticyclone becoming centred Biscay 1031 by midday Sunday. During Thursday night strong winds will affect most waters at times, and may increase further to reach gale strength across some waters of western Fitzroy during Friday afternoon and extend eastwards during the evening. Overnight and into Saturday morning these gales will transfer to southern Biscay then ease strong by afternoon. Winds will then be mainly light overnight and through Sunday

Portpatrick

On Thursday evening a complex area of low pressure centred over Atlantic to west of Ireland 989 is expected Shannon 998 by midday Friday with another low expected to become centred Southeast Iceland 998 by the same time. By midday Saturday both lows are expected to move away eastwards away from waters of Portpatrick, and by this time an anticyclone is expected just west of Trafalgar 1029, with a ridge extending northwards to lie just west of the Portpatrick area. This ridge of high pressure is then expected to move eastwards across all waters overnight with pressure then falling from the west during Sunday. During Thursday night and through Friday occasional strong winds may affect some waters, otherwise light winds will prevail. Strong winds will develop across western waters overnight, then become mainly confined to far northern waters later on Saturday. During Sunday strong southerly winds will move across from the west with possible gales later in the day

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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