Y Tywydd Rhagolwg Estynedig
Mae'r cynnwys hwn ar gael yn Saesneg yn unig.
Extended Outlooks 1800 UTC Mon 29 Aug to 1800 UTC Thu 01 Sep Issued by the Met Office, on behalf of the Maritime and Coastguard Agency, at 272300 UTC
On Monday evening, high pressure lies centred 1026 northeast of sea area Biscay, extending a ridge across the southern UK waters. At the same time an Atlantic low lying to the far northwest of Shannon brings declining pressure to the west of the UK. The high pressure then declines east, to lie in the eastern English Channel by midday Tuesday , with the Atlantic low moving northeast, to lie south of Iceland. An Azores high builds from the southwest on Wednesday, extending a ridge across southern UK waters, with low pressure also developing across the Iberian Peninsula. On Thursday the ridge declines south across sea areas Shannon, Fastnet and Sole, as another Atlantic low moves east to lie northwest of Shannon by midday. Most of Niton will see light winds through the period, but gales are possible in sea area Shannon and western Sole on Tuesday, and again later on Thursday as the low pressure moves eastGo to top of page
Monday evening high pressure is expected to be centred 1026 northwest France extending a ridge northeast across much of the North Sea. Low pressure lies over the Baltic moving east. An Atlantic low 987 lies to the southwest of Iceland at the same time. Through Tuesday the Atlantic low moves slowly east with pressure declining across the north and central North Sea, as the high pressure over France moves east to lie central Europe, extending a ridge over the southern North Sea. A further ridge builds from the southwest on Wednesday as the low to the north moves northeast into the Norwegian Sea. The high lies centred 1022 in the English Channel by midday Thursday, with a further Atlantic low moving eastward, to lie to the west of the UK. Gales are possible across Fisher and South Utsire Monday evening but soon easing. Further gales develop across Fair Isle and Viking through on Tuesday, slowly easing later on WednesdayGo to top of page
Monday evening, high pressure centred Bay of Biscay, extends a ridge across the UK, with an Atlantic low to the far west. Through Tuesday, the Atlantic low 987 then moves northeast to lie south of Iceland by midday, as the ridge to the south declining east. The low 988 then continues to moves northeast to lie east of Iceland by midnight. This moves northeast as filling feature by midnight. A ridge builds across the UK from the south on Wednesday, with a further Atlantic low developing from the west through Thursday, to lie west of sea area Rockall by Thursday evening. Gales are possible across sea areas Rockall and Bailey on Monday evening, with these spreading to also include Malin, Hebrides, and Faeroes by midday Tuesday. Gales easing across Rockall and Malin later Tuesday and then elsewhere by Wednesday afternoon. Strong winds are then expected to develop in the west of Bailey and Rockall through Thursday morningGo to top of page
Last Updated at 23:39 UTC on Saturday 27 August