Y Tywydd Rhagolwg Estynedig

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Iaith

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 Sun 20 Apr to 1800 UTC Wed 23 Apr Issued by the Met Office, on behalf on the Maritime and Coastguard Agency, at 182300 UTC

  1. Niton

    Low 1000 centred north of Brittany midnight Monday will move slowly westwards to Sole by midnight Tuesday 1002 then filling completely by midday. Low 1002 west of Portugal Sunday evening will move eastwards and fill overnight. Transient ridge will build across Fitzroy and Biscay for a time during Monday before slowly declining southeastwards into the continent by midday Wednesday. Deep Atlantic low 994 expected 52 north 21 west by midday Tuesday, moving slowly northwards to 58 north 20 west by the end of Wednesday deepening slightly to 991. Azores anticyclone will build a ridge across southern Fitzroy by the end of Wednesday. Strong north to northwesterly winds will initially affect Lundy, Fastnet, Irish Sea extending into Sole by Monday morning before easing by midday. Strong southerly winds will then develop in Fitzroy by the end of Tuesday before veering westerly overnight and decreasing. Strong to gale-force southwesterly winds will affect Shannon for a time during Wednesday

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  2. Cullercoats

    Low 1000 centred north of Brittany midnight Monday will move slowly westwards to Sole by midnight Tuesday 1002 then filling completely by midday. Large anticyclone will extend westwards from Scandinavia into Southeast Iceland with centre 1024 Sunday evening. This anticyclone will move slowly eastwards north of Faeroes 1025 by midday Monday. Anticyclone will then move northwards into Norwegian Sea during Tuesday and Wednesday, building to 1034. Deep Atlantic low 994 expected 52 north 21 west by midday Tuesday, moving slowly northwards to 58 north 20 west by the end of Wednesday deepening slightly to 991. Anticyclone 1034 building at same time across southern Scandinavia and the Baltic. Initially strong northeasterly winds in Forties, Dogger, Fisher and Humber will decrease by Monday morning. Winds remain northeasterly and become strong again in North Utsire by midnight Tuesday. These strong winds extend into Viking and Fair Isle by midday Tuesday before veering east to southeasterly during Wednesday and easing

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  3. Portpatrick

    Low 1000 centred north of Brittany midnight Monday will move slowly westwards to Sole by midnight Tuesday 1002 then filling completely by midday. Large anticyclone will extend westwards from Scandinavia into Southeast Iceland with centre 1024 Sunday evening. This anticyclone will move slowly eastwards north of Faeroes 1025 by midday Monday. Anticyclone will then move northwards into Norwegian Sea during Tuesday and Wednesday, building to 1034. Deep Atlantic low 994 expected 52 north 21 west by midday Tuesday, moving slowly northwards to 58 north 20 west by the end of Wednesday deepening slightly to 991. Strong northeasterly winds in Rockall, Hebrides and Bailey Sunday evening will veer easterly by midday Monday then decrease by the end of the day. Strong easterly winds then develop again in Bailey, Hebrides, Fair Isle, Faeroes and Southeast Iceland by early Tuesday and continue into Wednesday, extending into Rockall with southwesterly gales possible in Shannon and Rockall during Wednesday

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Last Updated at 23:34 UTC on Friday 18 April