Y Tywydd Dyfroedd Gyda'r Glannau

Gosodiadau
Iaith

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

Summary

Low pressure between Iceland and Scotland will sink southeastwards into Scotland during Thursday before turning northeastwards towards Scandinavia. It will remain cool and unsettled in all areas.

* Wind or gale warning issued

  1. From Cape Wrath to Rattray Head including Orkney * warning

    From Cape Wrath to Rattray Head including Orkney

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Cyclonic, becoming northerly or northeasterly 4 or 5, occasionally 6 for a time in north.
    • Sea State

      Slight or moderate, occasionally rough at first near Cape Wrath.
    • Weather

      Rain or showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Northerly 4 or 5, occasionally 6 in east.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  2. Rattray Head to Berwick on Tweed * warning

    Rattray Head to Berwick on Tweed

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      West backing southwest, becoming cyclonic, then north later, 4 or 5, increasing 6 at times.
    • Sea State

      Slight or moderate.
    • Weather

      Rain or showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      North backing northwest 4 or 5, increasing 6 at times.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  3. Berwick on Tweed to Whitby * warning

    Berwick on Tweed to Whitby

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Westerly 4 or 5, backing southwesterly 5 or 6, veering northerly or northwesterly 4 or 5 later in north.
    • Sea State

      Mainly moderate.
    • Weather

      Rain or showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Southwesterly at first in south, otherwise northwesterly 4 or 5, increasing 6 at times.
    • Sea State

      Mainly moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  4. Whitby to Gibraltar Point * warning

    Whitby to Gibraltar Point

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      West or southwest 4, increasing 5 or 6.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      West or southwest 5 or 6, veering northwest 4 or 5, backing west 3 or 4 later.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  5. Gibraltar Point to North Foreland * warning

    Gibraltar Point to North Foreland

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Westerly 3 or 4, backing southwesterly 5 or 6.
    • Sea State

      Slight, occasionally moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Southwesterly 5 or 6, veering westerly 4 or 5, then northwesterly 3 or 4 later.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  6. North Foreland to Selsey Bill * warning

    North Foreland to Selsey Bill

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Westerly 3 or 4, backing southwesterly 5 or 6.
    • Sea State

      Slight becoming moderate later.
    • Weather

      Showers.
    • Visibility

      Good.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Southwesterly 5 to 7, veering westerly 4 or 5, then northwesterly 3 or 4 later.
    • Sea State

      Slight or moderate.
    • Weather

      Showers, thundery for a time.
    • Visibility

      Good, occasionally moderate.

    Issued at 23:00 UTC on Wednesday 20th Aug

  7. Selsey Bill to Lyme Regis * warning

    Selsey Bill to Lyme Regis

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      West or southwest 4 or 5, increasing 6 later.
    • Sea State

      Slight becoming moderate later.
    • Weather

      Showers.
    • Visibility

      Good.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      West or southwest 5 to 7, veering west or northwest 4 or 5.
    • Sea State

      Slight or moderate.
    • Weather

      Showers, thundery for a time.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  8. Lyme Regis to Lands End including the Isles of Scilly * warning

    Lyme Regis to Lands End including the Isles of Scilly

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Westerly or northwesterly 3 or 4, backing westerly or southwesterly 5 or 6 later.
    • Sea State

      Slight, occasionally moderate later.
    • Weather

      Showers.
    • Visibility

      Good.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Westerly 5 or 6, veering northwesterly 3 or 4, occasionally 5 in east.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  9. Lands End to St Davids Head including the Bristol Channel * warning

    Lands End to St Davids Head including the Bristol Channel

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      West backing southwest for a time, 3 or 4, increasing 5 or 6.
    • Sea State

      Slight becoming moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      West 5 or 6, veering northwest 4 or 5.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Mainly good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  10. St Davids Head to Great Ormes Head, including St Georges Channel * warning

    St Davids Head to Great Ormes Head, including St Georges Channel

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      West 4 or 5, backing southwest 5 or 6, then veering northwest later.
    • Sea State

      Slight becoming moderate.
    • Weather

      Showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Northwest 5 or 6, decreasing 3 or 4 later.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Mainly good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  11. Great Ormes Head to the Mull of Galloway * warning

    Great Ormes Head to the Mull of Galloway

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      West 4 or 5, backing southwest 5 or 6, then veering northwest later.
    • Sea State

      Slight or moderate.
    • Weather

      Rain or showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Northwest 5 or 6, decreasing 3 or 4 later.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  12. Isle of Man * warning

    Isle of Man

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      West 4 or 5, backing west or southwest 5 or 6, veering northwest 4 or 5 later.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      West or northwest, 4 or 5.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good, occasionally moderate.

    Issued at 23:00 UTC on Wednesday 20th Aug

  13. Lough Foyle to Carlingford Lough * warning

    Lough Foyle to Carlingford Lough

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Southwest, veering north or northwest later, 5 or 6.
    • Sea State

      Slight or moderate, becoming moderate or rough later in north.
    • Weather

      Rain or showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      North or northwest 4 or 5, occasionally 6 at first.
    • Sea State

      Slight or moderate, occasionally rough at first in north.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  14. The Mull of Galloway to Mull of Kintyre including the Firth of Clyde and the North Channel * warning

    The Mull of Galloway to Mull of Kintyre including the Firth of Clyde and the North Channel

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Southwesterly, veering northerly or northwesterly later, 5 or 6.
    • Sea State

      Slight or moderate, becoming moderate or rough later towards Mull of Kintyre.
    • Weather

      Rain or showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Northerly or northwesterly 4 or 5, occasionally 6 at first.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  15. Mull of Kintyre to Ardnamurchan Point * warning

    Mull of Kintyre to Ardnamurchan Point

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      West or southwest veering northwest, then north later, 5 or 6, increasing 7 at times.
    • Sea State

      Slight or moderate, becoming moderate or rough in west.
    • Weather

      Rain or showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      North or northwest 4 or 5, increasing 6 at times.
    • Sea State

      Slight or moderate, occasionally rough at first in west.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  16. The Minch * warning

    The Minch

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Cyclonic, becoming northeasterly 5 or 6, increasing 7 at times, backing northerly 4 or 5 later.
    • Sea State

      Slight or moderate, occasionally rough at first in far north.
    • Weather

      Rain then showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Northerly 4 or 5.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  17. Ardnamurchan Point to Cape Wrath including the Outer Hebrides * warning

    Ardnamurchan Point to Cape Wrath including the Outer Hebrides

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Cyclonic, becoming northeasterly 5 or 6, increasing 7 at times, backing northerly 4 or 5 later.
    • Sea State

      Moderate or rough.
    • Weather

      Rain then showers.
    • Visibility

      Good, occasionally moderate.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Northerly 4 or 5, occasionally 6 in west.
    • Sea State

      Moderate.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  18. Shetland Isles * warning

    Shetland Isles

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    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      West or northwest, becoming northeast later, but becoming variable at times, 3 or 4.
    • Sea State

      Slight or moderate.
    • Weather

      Showers.
    • Visibility

      Mainly good.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      --
    • Sea State

      --
    • Weather

      --
    • Visibility

      --

    Issued at 23:00 UTC on Wednesday 20th Aug

    For coastal areas up to 60 nautical miles from Lerwick, Shetland

    Gale Warnings in operation for Sea Area Fair Isle: Nil.

    23:00 UTC Wed 20th Aug – 10:59 UTC Thu 21st Aug

    • Wind

      West or northwest 4, occasionally variable 3.
    • Sea State

      Slight to moderate.
    • Weather

      Showers.
    • Visibility

      Mainly good.

    11:00 UTC Thu 21st Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Northerly, occasionally variable, 3 or 4. becoming northeasterly 4.
    • Sea State

      Slight to moderate.
    • Weather

      Showers.
    • Visibility

      Mainly good.

    Issued at 23:00 UTC on Wednesday 20th Aug

  19. The Channel Islands * warning

    The Channel Islands

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    Strong wind warning

    23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

    • Wind

      Northwest to west 2 to 4, backing west to southwest in the morning, then mainly westerly 4 to 5 in the afternoon, perhaps 6 in the north by midnight.
    • Sea State

      Slight, becoming locally moderate in the north by evening.
    • Weather

      Risk of a shower.
    • Visibility

      Good.

    23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

    • Wind

      Southwest to west 4 to 5, perhaps locally 6 for a time in the north overnight, veering northwest by noon, decreasing 3 to 4 in the afternoon.
    • Sea State

      Slight in the south to moderate perhaps rather rough for a time in the north, decreasing slight in the evening.
    • Weather

      Scattered showers, becoming isolated in the afternoon.
    • Visibility

      Good, locally moderate in showers.

    Issued at 23:00 UTC on Wednesday 20th Aug

Rattray Head to Berwick on Tweed

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Strong wind warning

23:00 UTC Wed 20th Aug – 22:59 UTC Thu 21st Aug

  • Wind

    West backing southwest, becoming cyclonic, then north later, 4 or 5, increasing 6 at times.
  • Sea State

    Slight or moderate.
  • Weather

    Rain or showers.
  • Visibility

    Good, occasionally moderate.

23:00 UTC Thu 21st Aug – 22:59 UTC Fri 22nd Aug

  • Wind

    North backing northwest 4 or 5, increasing 6 at times.
  • Sea State

    Slight or moderate.
  • Weather

    Showers.
  • Visibility

    Good.

Issued at 23:00 UTC on Wednesday 20th Aug