2200 UTC Sunday 28 August to 2200 UTC Wednesday 31 August 2016
Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 262117 UTC
On Sunday evening, low pressure is expected to be centred 1006 north of Denmark, moving east and also gradually filling. A slack flow will lie across the rest of Cullercoats, whilst a weak ridge of high pressure will build across the UK. This ridge continues building Monday with a high pressure centre 1024 developing in the English Channel, before this transfers east into Continental Europe during Tuesday. At the same time a deep low pressure is expected to develop in the Atlantic Ocean, moving northeast to be centred 984 to the south of Iceland by midnight Tuesday. This then continues northeast, to be centred 981 west of the Faroe Islands by Wednesday evening. Strong winds are possible in the far east on Sunday evening, however winds will be light, until Tuesday morning. Strong winds are then likely to develop across the northwest of Cullercoats, and are likely to persist during Wednesday
On Sunday evening, the Azores high pressure, centred 1027 to the west of Fitzroy, will ridge across Niton, into continental Europe and also across Ireland. Low pressure will be centred 1006 north of Demark, but clearing east as a filling feature. During Monday high pressure will become centred 1025 Biscay, as a developing Atlantic low pressure system moves northeast, to the northwest of Niton, before becoming centred south of Iceland by Tuesday evening. High pressure will then receded into Continental Europe during Wednesday, whilst the Azores High will rebuild. Shallow low pressure will also persist across the Iberian peninsula. Light winds are expected across much of Niton during the period. However strong winds will develop across west Shannon, Sole and northwest Fitzroy Monday afternoon, and will continue during Tuesday and Wednesday. Gales are then also possible across northwest Shannon during Wednesday
On Sunday evening a slack flow is expected across Portpatrick, with a weak ridge of high pressure extending across Ireland. This continues to build during Monday with high pressure becoming centred in the bay of Biscay. A the same time a deepening Atlantic low pressure system will move northeast to be centred 983 far to the west of Portpatrick. This stops deepening, but continues moving northeast during Tuesday to be centred 984 to the south of Iceland by midnight Tuesday. This then continues northeast as a filling feature on Wednesday, to be centred 990 South East Iceland by the evening. Winds will initially be light across Portpatrickm, however strong winds will develop across Shannon, Rockall and Malin on Monday. These then extend across the rest of Portpatrick during Tuesday. There will then be the risk of occasional gales spreading into areas south of 60N during Wednesday
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.
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.