Y Tywydd Rhagolwg Estynedig
Mae'r cynnwys hwn ar gael yn Saesneg yn unig.
Extended Outlooks 1800 UTC Sat 22 Oct to 1800 UTC Tue 25 Oct Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 202300 UTC
On Saturday evening a deep low is expected to be centred 250 miles west of Fitzroy 986 with a cyclonic airflow covering all waters on Niton. Overnight and into Sunday this low is expected to move a little further east towards Fitzroy becoming 981 by midday. The low will then probably move slowly south to become centred just west of Trafalgar 986 by midday Monday, with a broad trough extending northeast across Biscay and Fitzroy. By midday Tuesday the low is expected to continue filling and moving away southwards, as a ridge extending from the northeast across the UK to northern Fitzroy. On Saturday night gales look set to affect some western waters of Niton and may extend further east to affect some English Channel waters on Sunday. Winds then decreasing to strong or less by Monday morning. On Tuesday strong easterly winds may continue across southwest FitzroyGo to top of page
On Saturday evening an area of high pressure will cover northern waters of the Cullercoats area with a low expected to be centred across northern Germany 1013. By midday Sunday current indications are for this area of low pressure to transfer to sea area German Bight 1014. This low is then expected to decline with an easterly airflow dominating most waters by Monday morning. By midday Tuesday little overall change is expected across the Cullercoats area with a broad ridge of high pressure extending from south Finland to Ireland. There is a chance of northeasterly gales affecting some waters of sea area Fisher for a time on Sunday, before gradually decreasing to strong during the afternoon. On Monday easterly winds will increase to strong to affect most waters of Cullercoats before tending to decrease in strength during Tuesday. Confidence is low for detail by TuesdayGo to top of page
On Saturday evening a deep low is expected to be centred 250 miles west of Fitzroy 986. Across most waters of Portpatrick a broad ridge of high pressure will cover most northern waters. Overnight and into Sunday the low is expected to move a little further east towards Fitzroy becoming 981 by midday. Thereafter the low is expected to fill and move away southwards. By midday Monday another low is expected just west of Iceland 1002 and this will quickly move away northeast. By midday Tuesday a deeper low is expected to become centred 300 miles southwest of Iceland 969 with a slow-moving, broad ridge of high pressure extending from southern Norway to Ireland. Easterly gales may affect far southern waters of Portpatrick on Saturday night and during Sunday before decreasing strong by Monday morning. On Tuesday current indications are for southerly gales to increase to reach gale strength across Bailey, Faeroes and Southeast IcelandGo to top of page
Last Updated at 23:36 UTC on Thursday 20 October