Y Tywydd Rhagolwg Estynedig

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Mae'r cynnwys hwn ar gael yn Saesneg yn unig.

Map of extended outlook areas

Map Key

  • dark blue Niton
  • purple Cullercoats
  • dark green Portpatrick

Extended Outlooks 1800 UTC Fri 22 Aug to 1800 UTC Mon 25 Aug Issued by the Met Office, on behalf on the Maritime and Coastguard Agency, at 202300 UTC

  1. Niton

    On Friday evening an area of high pressure lies across the east Atlantic and the Bay of Biscay. A broad area of low pressure lies across much of the UK and the English Channel. Overnight Friday and during Saturday the high pressure builds and migrates eastwards across the UK, bringing high pressure and light winds to the whole Niton area, including the English Channel. Overnight Saturday and into Sunday, a deep area of low pressure develops over the eastern Atlantic, centred 992 approximately 52N 25W at midday Sunday, bringing very strong to gale-force southerly or southeasterly winds to much of Niton, though winds remain light in Biscay and the English Channel. The low moves east and deepens overnight Sunday, centred 990 over Lundy by midday Monday, and bringing strong to gale- force winds to much of the Niton area throughout Monday, though winds to the north of the low should be lighter

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  2. Cullercoats

    On Friday evening a broad area of low pressure, centred 1001 southern Norway, lies across the Norwegian Basin, Faeroes and Fair Isle, the North Sea and the English Channel. Overnight Friday and during Saturday the low pressure area remains static while the high pressure migrates eastwards across the UK. This brings slack pressure and light winds to the English Channel, but strengthens the cyclonic flow over the North Sea, bringing strong to near gale northwesterly winds. Overnight Saturday and into Sunday, the low pressure over Norway migrates east and begins to fill, but the high pressure over the UK also migrates east, maintaining the strong winds in the North Sea during Sunday. Overnight Sunday into Monday a deep area of low pressure from the eastern Atlantic moves eastwards across the UK, displacing the high pressure to over the North Sea, but bringing strong southerly winds to the western North Sea by daytime Monday

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  3. Portpatrick

    On Friday evening an area of high pressure lies across Iceland and the eastern Atlantic. A broad area of low pressure centred southern Norway lies across Faeroes and Fair Isle and much of the UK. Overnight Friday and during Saturday the high pressure builds, covering the whole Portpatrick area by Saturday evening. Overnight Saturday and into Sunday, a deep area of low pressure develops over the eastern Atlantic, centred 992 approximately 52N 25W at midday Sunday, bringing very strong to gale-force southerly or southeasterly winds to Lundy, Fastnet, Irish Sea, Shannon, Rockall and Malin. The low moves east and deepens overnight Sunday into Monday, centred 990 over Lundy by midday Monday, bringing strong to gale-force cyclonic winds to the Portpatrick area approximately south of 60N throughout the day on Monday. Elsewhere, weak high pressure or slack pressure gradients persist, bringing light winds

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Last Updated at 23:37 UTC on Wednesday 20 August