Y Tywydd Dyfroedd Gyda'r Glannau

Gosodiadau
Iaith

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

Summary

A transient ridge of high pressure will move northeastwards across the British Isles on Thursday evening, with a strong south to southwesterly airflow then following during Friday.

* 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

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      Southerly or southwesterly 4 or 5, occasionally 6 in north, backing southeasterly 3 or 4 for a time.
    • Sea State

      Moderate or rough at first to the west and north of Orkney, otherwise slight or moderate.
    • Weather

      Rain for a time later.
    • Visibility

      Good, occasionally moderate later.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      South 4 or 5 veering southwest 5 to 7, occasionally gale 8 near Cape Wrath.
    • Sea State

      Slight or moderate, but becoming rough or very rough to the west and north of Orkney.
    • Weather

      Showers.
    • Visibility

      Moderate or good.

    Issued at 18:00 UTC on Thursday 8th Dec

  2. Rattray Head to Berwick on Tweed * warning

    Rattray Head to Berwick on Tweed

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      Southwest 4 or 5, occasionally variable 3 at first, then increasing 6 at times.
    • Sea State

      Slight, occasionally moderate in north.
    • Weather

      Rain for a time later.
    • Visibility

      Good, occasionally moderate later.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

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

      Slight or moderate.
    • Weather

      Mainly fair.
    • Visibility

      Good.

    Issued at 18:00 UTC on Thursday 8th Dec

  3. Berwick on Tweed to Whitby

    Berwick on Tweed to Whitby

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    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      South or southwest 3 or 4, increasing 5 at times.
    • Sea State

      Slight.
    • Weather

      Rain at times later.
    • Visibility

      Moderate or good.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwest 4 or 5, occasionally 3 at first.
    • Sea State

      Slight.
    • Weather

      Rain at times then fair.
    • Visibility

      Good, occasionally moderate at first.

    Issued at 18:00 UTC on Thursday 8th Dec

  4. Whitby to Gibraltar Point * warning

    Whitby to Gibraltar Point

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      West backing southwest 4 or 5, occasionally 3 at first, then increasing 6 at times later.
    • Sea State

      Slight.
    • Weather

      Mainly fair.
    • Visibility

      Good, occasionally poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwesterly 3 or 4, but 5 or 6 at first in south.
    • Sea State

      Slight.
    • Weather

      Rain at times.
    • Visibility

      Good, occasionally moderate.

    Issued at 18:00 UTC on Thursday 8th Dec

  5. Gibraltar Point to North Foreland * warning

    Gibraltar Point to North Foreland

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      Southwesterly 4 or 5, occasionally 3 at first, then increasing 6 at times later in north.
    • Sea State

      Slight or moderate.
    • Weather

      Fog patches developing.
    • Visibility

      Moderate or good, occasionally very poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwesterly 4 or 5, occasionally 6 at first, then becoming variable 3 later in north.
    • Sea State

      Slight, occasionally moderate at first.
    • Weather

      Rain at times, fog patches.
    • Visibility

      Moderate or good, occasionally very poor.

    Issued at 18:00 UTC on Thursday 8th Dec

  6. North Foreland to Selsey Bill * warning

    North Foreland to Selsey Bill

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      Southwesterly 4 or 5, occasionally 6 at first in east, then decreasing 3 at times later.
    • Sea State

      Slight or moderate.
    • Weather

      Fog patches developing.
    • Visibility

      Moderate or good, occasionally very poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

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

      Slight or moderate.
    • Weather

      Rain later.
    • Visibility

      Good, occasionally poor.

    Issued at 18:00 UTC on Thursday 8th Dec

  7. Selsey Bill to Lyme Regis * warning

    Selsey Bill to Lyme Regis

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      Southwest 4 or 5, occasionally 3 at first, then increasing 6 at times later.
    • Sea State

      Moderate.
    • Weather

      Fog patches.
    • Visibility

      Moderate or good, occasionally very poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwesterly, veering northwesterly later in west, 4 or 5, increasing 6 at times.
    • Sea State

      Moderate or rough.
    • Weather

      Rain later.
    • Visibility

      Good, occasionally poor.

    Issued at 18:00 UTC on Thursday 8th Dec

  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

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      South or southwest 4 or 5, occasionally 3 at first, then increasing 6 at times.
    • Sea State

      Slight or moderate in east, mainly moderate or rough in west, but becoming very rough later in far west.
    • Weather

      Fog patches at first.
    • Visibility

      Moderate or good, occasionally very poor at first.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      South or southwest becoming cyclonic, then becoming northwest later, 4 or 5, increasing 6 at times.
    • Sea State

      Moderate or rough in east, rough or very rough in west.
    • Weather

      Rain or drizzle, becoming fair later.
    • Visibility

      Good, occasionally poor.

    Issued at 18:00 UTC on Thursday 8th Dec

  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

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      Variable 3 or 4 becoming southerly or southwesterly 4 or 5, occasionally 6 in west.
    • Sea State

      Moderate or rough in west, slight or moderate in east.
    • Weather

      Rain or drizzle at times, fog patches at first.
    • Visibility

      Moderate or good, occasionally very poor at first.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwesterly 4 or 5, occasionally 6 at first in west, becoming variable 2, then becoming west 4 or 5 later.
    • Sea State

      Moderate or rough, but occasionally very rough at first in west.
    • Weather

      Rain or drizzle, becoming fair later.
    • Visibility

      Good, occasionally poor.

    Issued at 18:00 UTC on Thursday 8th Dec

  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

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      South or southwest 4 or 5, increasing 5 to 7 for a time.
    • Sea State

      Slight or moderate in far north, otherwise moderate or rough.
    • Weather

      Fair then rain and drizzle, fog patches for a time.
    • Visibility

      Moderate or good, occasionally very poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwesterly, veering westerly later, 3 or 4, occasionally 5 in north.
    • Sea State

      Slight or moderate in far north, otherwise moderate or rough.
    • Weather

      Rain or drizzle, becoming fair later.
    • Visibility

      Good, occasionally poor.

    Issued at 18:00 UTC on Thursday 8th Dec

  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

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      Southwest 3 or 4 backing south 5 to 7, then veering southwest 4 or 5 later.
    • Sea State

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

      Rain or drizzle at times, fog patches at first.
    • Visibility

      Moderate or good, occasionally very poor at first.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwesterly 4 or 5, occasionally 6 at first in north, then veering westerly later.
    • Sea State

      Moderate or rough at first in north, otherwise slight or moderate.
    • Weather

      Rain then fair, then showers later.
    • Visibility

      Good, occasionally poor at first.

    Issued at 18:00 UTC on Thursday 8th Dec

  12. Isle of Man * warning

    Isle of Man

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      South or southwest 3 or 4 increasing 5 to 7.
    • Sea State

      Slight, becoming moderate or rough.
    • Weather

      Fair then rain or drizzle.
    • Visibility

      Good, occasionally poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

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

      Moderate, becoming slight or moderate.
    • Weather

      Rain then fair, then showers later.
    • Visibility

      Good, occasionally poor at first.

    Issued at 18:00 UTC on Thursday 8th Dec

  13. Lough Foyle to Carlingford Lough * warning

    Lough Foyle to Carlingford Lough

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      South or southwest 3 or 4 increasing 5 to 7.
    • Sea State

      Slight or moderate, becoming moderate or rough for a time in east.
    • Weather

      Rain for a time.
    • Visibility

      Good, occasionally poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

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

      Slight or moderate in east, moderate or rough in north.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 18:00 UTC on Thursday 8th Dec

  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

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      Southwest 3 or 4 backing south 5 to 7.
    • Sea State

      Slight or moderate becoming moderate or rough.
    • Weather

      Rain for a time.
    • Visibility

      Good, occasionally poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      South veering southwest 5 or 6, decreasing 4 at times.
    • Sea State

      Slight or moderate, occasionally rough.
    • Weather

      Showers.
    • Visibility

      Good.

    Issued at 18:00 UTC on Thursday 8th Dec

  15. Mull of Kintyre to Ardnamurchan Point * warning

    Mull of Kintyre to Ardnamurchan Point

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      South or southwest 3 or 4 increasing 5 to 7.
    • Sea State

      Slight at first in shelter, otherwise moderate or rough, but becoming very rough later near Tiree.
    • Weather

      Fair then rain, then showers later.
    • Visibility

      Good, occasionally poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwesterly 5 to 7, occasionally gale 8 in far north.
    • Sea State

      Moderate or rough in south, very rough or high in north.
    • Weather

      Showers.
    • Visibility

      Moderate or good, occasionally poor in north.

    Issued at 18:00 UTC on Thursday 8th Dec

  16. The Minch * warning

    The Minch

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      South or southwest 4 or 5, occasionally 6 at first, then increasing 6 to gale 8.
    • Sea State

      Slight or moderate, becoming rough in south.
    • Weather

      Fair then rain, then showers later.
    • Visibility

      Good, occasionally poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwest 6 to gale 8.
    • Sea State

      Moderate or rough, occasionally very rough in south.
    • Weather

      Showers.
    • Visibility

      Moderate or good.

    Issued at 18:00 UTC on Thursday 8th Dec

  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

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      South or southwest 4 or 5, occasionally 6 at first, then increasing 6 to gale 8.
    • Sea State

      Moderate or rough, becoming very rough later to the west of the Outer Hebrides.
    • Weather

      Fair then rain, then showers later.
    • Visibility

      Good, occasionally poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southwest 6 to gale 8.
    • Sea State

      Moderate or rough near Sutherland, otherwise very rough or high.
    • Weather

      Showers.
    • Visibility

      Moderate or good, occasionally poor.

    Issued at 18:00 UTC on Thursday 8th Dec

  18. Shetland Isles * warning

    Shetland Isles

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      West or southwest 5 to 7 decreasing 3 or 4, then backing south 4 or 5 later.
    • Sea State

      Moderate or rough in west, slight or moderate in east.
    • Weather

      Rain at times.
    • Visibility

      Good, occasionally poor.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      --
    • Sea State

      --
    • Weather

      --
    • Visibility

      --

    Issued at 18:00 UTC on Thursday 8th Dec

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

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

    18:00 UTC Thu 8th Dec – 05:59 UTC Fri 9th Dec

    • Wind

      Westerly or southwesterly 5 or 6, occasionally 7 at first in north, then decreasing 3 or 4 later.
    • Sea State

      Moderate or rough, becoming slight or moderate in east.
    • Weather

      Rain for a time.
    • Visibility

      Good, occasionally poor.

    06:00 UTC Fri 9th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      Westerly or southwesterly backing southerly, 3 or 4, occasionally 5 in west.
    • Sea State

      Moderate or rough in west, slight or moderate in east.
    • Weather

      Rain later.
    • Visibility

      Good, occasionally poor.

    Issued at 18:00 UTC on Thursday 8th Dec

  19. The Channel Islands * warning

    The Channel Islands

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    Strong wind warning

    18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

    • Wind

      South 3 or 4, occasionally 5, increasing 4 or 5 overnight, perhaps locally 6 at times on Friday.
    • Sea State

      Slight or moderate.
    • Weather

      Mist, with a risk of fog patches, especially overnight and on Friday morning.
    • Visibility

      Moderate or good, locally poor or very poor at times.

    18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

    • Wind

      Southerly or southwesterly 4 or 5, perhaps locally 6 at times, veering northwesterly in the northwest of the area later on Saturday.
    • Sea State

      Slight or moderate, perhaps rather rough in the north at times, with swell.
    • Weather

      Risk of mist patches, rain spreading from the northwest on Saturday afternoon.
    • Visibility

      Moderate or good, becoming moderate or poor in rain.

    Issued at 18:00 UTC on Thursday 8th Dec

Lyme Regis to Lands End including the Isles of Scilly

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Strong wind warning

18:00 UTC Thu 8th Dec – 17:59 UTC Fri 9th Dec

  • Wind

    South or southwest 4 or 5, occasionally 3 at first, then increasing 6 at times.
  • Sea State

    Slight or moderate in east, mainly moderate or rough in west, but becoming very rough later in far west.
  • Weather

    Fog patches at first.
  • Visibility

    Moderate or good, occasionally very poor at first.

18:00 UTC Fri 9th Dec – 17:59 UTC Sat 10th Dec

  • Wind

    South or southwest becoming cyclonic, then becoming northwest later, 4 or 5, increasing 6 at times.
  • Sea State

    Moderate or rough in east, rough or very rough in west.
  • Weather

    Rain or drizzle, becoming fair later.
  • Visibility

    Good, occasionally poor.

Issued at 18:00 UTC on Thursday 8th Dec