Coast and sea

Extended outlook

Issued at: .

For the period to .

Extended outlook map

Cullercoats

This period is expected to start with a main low, 1005, centred over Irish Sea, perhaps entraining a shallow and indistinct feature on its southern flank, perhaps 1010 in the Southwest Approaches. A third low is expected to lie over southern Scandinavia, 1005 late Wednesday. High pressure should predominate near Iceland throughout. All three aforementioned lows should progress eastwards through Thursday, but only the Scandinavian low should see out the period, taking up residence near the Baltic as an expansive but shallow feature into the weekend, as a new low perhaps reaches Ireland from the Atlantic to end the period. Occasional strong winds are possible in both English Channel Cullercoats areas and Fair Isle late Wednesday, perhaps affecting the far western North Sea for a time Thursday before generally easing. No hazardous winds should then predominate across much of Cullercoats, aside from developing strong winds in areas bordering southern Norway Friday into Saturday

Niton

This period is expected to start with a main low, 1005, centred over Irish Sea, perhaps entraining a shallow and indistinct feature on its southern flank, perhaps 1010 in the Southwest Approaches. Both aforementioned lows should progress eastwards through Thursday, with the northernmost filling over the North Sea as the southernmost deepens 999 for a time, before this too eventually loses its identity over France into Friday. A new low may then reach Ireland from the Atlantic to end the period. Near gales are possible in eastern Biscay late Wednesday, with gales for southern and central Fitzroy and occasional strong winds elsewhere. Winds should ease in Niton English Channel areas Thursday, however the risk of gales should move bodily eastwards into southern Biscay, with occasional strong winds remaining in western Niton generally. No hazardous winds are possible for a time Friday, ahead of a new swathe of gales perhaps spreading across far southern Niton into the weekend

Portpatrick

This period is expected to start with a main low, 1005, centred over Irish Sea, perhaps entraining a shallow and indistinct feature on its southern flank, perhaps 1010 in the Southwest Approaches. A third low is expected to lie over southern Scandinavia, 1005 late Wednesday. High pressure should predominate near Iceland throughout. All three aforementioned lows should progress eastwards through Thursday, with the southernmost deepening 999 for a time before losing its identity over France into Friday. A new low may then reach Ireland from the Atlantic to end the period. Occasional strong winds are possible in much of Portpatrick late Wednesday, perhaps reaching near gale briefly in Rockall, Bailey. Winds gradually easing to the extent that no hazardous winds predominate across Portpatrick for a time Friday, ahead of near gales perhaps fringing both the extreme north and extreme south of Portpatrick into the weekend

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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