Coast and sea

Extended outlook

Issued at: .

For the period to .

Extended outlook map

Cullercoats

Tuesday evening a broad Low 997 is expected to be centred across Rockall. This will move slowly northwards, filling to lie near Bailey, 1005, by the end of Wednesday, with a secondary, shallower Low developing in the Irish Sea. High pressure initially close to Denmark, 1021 on Tuesday, declines with a larger High cell becoming dominant over northern Scandinavia. This then slowly moves southeast into northwest Russia, where it becomes slow moving through to Friday evening. A mainly cyclonic pattern persists over the UK and surrounding sea areas during Thursday and early Friday with a broad Low complex west of the Atlantic Sea areas, though a transient ridge of High pressure crosses the UK on Friday. No gales are currently expected in Cullercoats sea areas during the period, though strong winds are likely fairly widely in the North Sea on Tuesday evening and early Wednesday

Niton

Tuesday evening a large low 997 is expected to be centred across Rockall. This will move slowly northwards, filling to lie near Bailey 1005 by the end of Wednesday, with a secondary, shallower low developing in the Irish Sea. High pressure initially close to Denmark, 1021 on Tuesday, declines with a larger high cell becoming dominant over northern Scandinavia and later northwest Russia. A mainly cyclonic pattern persists over Niton sea areas during Thursday and early Friday with a broad low complex west of the Atlantic Sea areas, though a transient ridge of high pressure crosses the UK on Friday. Later Friday a small scale Low within the wider complex may deepen as it approaches Rockall. Gales or near gales are likely for a time Tuesday evening and early Wednesday across western parts of Shannon before easing. A further swathe of near gales or gales are possible near the low on Friday, affecting Shannon

Portpatrick

Tuesday evening a large low 997 is expected to be centred across Rockall. This will move slowly northwards, filling to lie near Bailey 1005 by the end of Wednesday, with a secondary, shallower low developing in the Irish Sea. High pressure initially close to Denmark, 1021 on Tuesday, declines with a larger high cell becoming dominant over northern Scandinavia and later northwest Russia. A mainly cyclonic pattern persists over Portpatrick sea areas during Thursday and early Friday with a broad low complex west of the Atlantic Sea areas, though a transient ridge of high pressure crosses the UK on Friday. Later Friday a small scale low within the low complex may deepen as it approaches Rockall. Gales or near gales are likely for a time Tuesday evening and early Wednesday across western parts of Shannon and Rockall before easing. A further swathe of near gales or gales are possible near the low on Friday, affecting Shannon, Rockall and Malin

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.

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