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Extended outlook

2100 UTC Wednesday 20 September to 2100 UTC Saturday 23 September 2017

Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 182043 UTC

Cullercoats

On Wednesday evening a deepening area of low pressure 984 lies just to the south of Iceland, whilst a second low 1008 lies in the Irish Sea. High pressure centred over the near continent extends a ridge over the North Sea and continental Europe, and a further small, filling low 1014 lies over Norway. Overnight and into Thursday high pressure migrates eastwards, whilst the low over the Irish Sea runs northeastwards over the UK and into the Norwegian Sea, with a transient ridge building in its wake to the west. Later on Thursday another small scale low forms to the west of the UK, moving northwest near Northern Ireland and the West of Scotland and filling through Friday. On Saturday a deep low forms in the Atlantic, bringing a strengthening southerly flow across the UK and surrounding waters. Strong winds southerly winds are likely on most days north of 56N, reaching near gale occasionally north of 58N

Niton

Wednesday evening, low pressure 984 lies just to the south of Iceland, whilst a second low 1008 lies Irish Sea. High pressure centred over the near continent extends a ridge over the North Sea and continental Europe. Overnight and into Thursday high pressure migrates eastwards, whilst the low over the Irish Sea runs northeastwards over the UK and into the Norwegian Sea, with a transient ridge building to the west. Later on Thursday another small scale low forms to the west of the UK, moving northwest near Northern Ireland and the West of Scotland and filling through Friday. On Saturday a deep low forms in the Atlantic, bringing a strengthening southerly flow across the UK and surrounding waters. Strong winds are likely across northwestern sea areas from Thursday onward, reaching near gale or gale over Sole, Fastnet and Shannon. Strong winds spreading east on Friday and Saturday, becoming near gale or gale west of 08W

Portpatrick

Wednesday evening, low pressure 984 lies just to the south of Iceland, whilst a second low 1008 lies Irish Sea. High pressure centred over the near continent extends a ridge over the North Sea. Overnight high pressure migrates eastwards, whilst the low over the Irish Sea runs northeastwards over the UK and into the Norwegian Sea, with a transient ridge building to the west. Later on Thursday another small scale low forms to the west of the UK, moving northwest near Northern Ireland and the West of Scotland and filling through Friday. Saturday a deep low forms in the Atlantic, bringing a strengthening southerly flow across the UK and surrounding waters. Strong winds will affect much of Portpatrick throughout, with gales across the north Wednesday evening and overnight into Thursday, and then across southern and eastern sea areas Thursday night into Friday. Winds strengthening later on Friday from the west, reaching near gale or gale most areas by Saturday evening

Marine weather extended outlook for the next 3 to 5 days

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.

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.

Caution: The internet is not part of the Maritime Safety Information system and should never be relied upon as the only means to obtain the latest forecast and warning information. Access to the service may be interrupted or delayed from time to time, updates may also be delayed. Please refer to GMDSS services, INMARSAT SafetyNET or international NAVTEX for the latest information. When using these web pages, always check that the page on your screen is not from your cache. Use the Refresh or Reload button if in any doubt.

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