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Extended Outlook

Extended outlook forecast

Issued: 2101 on Mon 27 Apr 2015 UTC

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

Valid from 2200 on Wed 29 Apr 2015 UTC until 2200 on Sat 02 May 2015 UTC

Cullercoats

At first Wednesday evening low centred just east of Aberdeen, 999. Low moves southeast to become centred across the middle of the North Sea by midday Thursday, 1003. Low then moves east reaching the southern Baltic Sea midday Friday, 994. A ridge of high pressure then extends south and east across the Cullercoats region Friday night and during Saturday. Strong winds across Fair Isle Wednesday evening, with a chance of near gales at first. Overnight isolated strong winds persist across Fair Isle, then abate Thursday morning. Friday strong winds are expected to develop across the northeast of the region, chance of near gales developing across South Utsire and Fisher. Saturday strong winds or near gales continue across the northeast of the region, the near gales more likely, especially across North and South Utsire, and later in the day across Fisher

Niton

Initially low centred near Aberdeen, 999. Low moves southeast to become centred mid North Sea by midday Thursday, 1003, and a slack pressure pattern follows across the region. Friday the ridge moves east across the UK as an Atlantic depression approaches the UK. Currently low expected 50N 30W, 990, midday Friday. Saturday the low is likely to become slow moving mid Atlantic and multi-centred, while Atlantic fronts slowly move northeastwards across the region. Isolated strong winds Wednesday night, mainly across the far north and far south of the region. Thursday morning most strong winds abate. Thursday night a band of strong winds is expected to move northeastwards across the west of the Niton region, with strong winds following to southern Fiztroy; these persisting through the rest of the forecast period. Friday strong winds also likely across Sole and Shannon, and possibly Fastnet. Saturday strong winds across Shannon initially, where they may increase to near gale force, before transferring away northwards

Portpatrick

Initially low centred near Aberdeen, 999. Low moves southeast to become centred mid North Sea by midday Thursday, 1003, and a weak ridge extends south across the Portpatrick region. Friday the ridge moves east across the UK as an Atlantic depression approaches the UK. Currently low expected 50N 30W, 990, midday Friday. Saturday low is expected to become slow moving mid Atlantic and multi-centred, with ridge conditions prevailing across the north of the Portpatrick region while Atlantic fronts try and move northeastwards across the south. North of 55N strong winds across many places Wednesday evening, with a chance of near gales at first across Fair Isle. Overnight north of 55N strong winds become isolated, then gradually abate through Thursday. Friday strong winds expected to gradually spread across Shannon, later Rockall and perhaps Fastnet. Saturday strong winds are likely mostly affect Shannon initially then also Rockall, possibly increasing near gale force, but also strong winds may extend across Malin and Bailey

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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