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Rhybuddion

Iau 19 Hydref Cyhoeddwyd am 12:00

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

YELLOW WARNING OF RAIN for Northern Ireland

Updated 11:30 on Wed 18th

Valid from 15:00 on Thu 19th to 23:55 on Thu 19th

Heavy rain will affect Northern Ireland later on Thursday. This will fall onto saturated ground and is likely to lead to flooding in places; delayed travel may well result, including through the busy evening period. It is possible that a few properties or businesses could also be affected.

Rain will spread into Northern Ireland on Thursday morning, turning persistent and occasionally heavy in the afternoon and lasting well into the evening before dying out. 20 to 40 mm of rain within 12 hours, (perhaps nearer 60 mm over the Mournes) falling on already very wet ground, seems likely to lead to flooding of some prone locations.

YELLOW WARNING OF WIND for Wales, the Midlands, South West, South East, North West and Eastern England

Updated 12:00 on Thurs 19th

Valid from 04:00 on Sat 21st to 23:59 on Sat 21st

A spell of strong southwesterly winds is expected. Some coastal routes and communities are likely to be affected by large waves, with potential for flooding of properties. Some transport disruption is likely across the warning area, with delays to road, rail, air and ferry transport. Short term loss of power and other services is also possible.

An intense low pressure system is expected to bring a swathe of strong winds over southwestern areas early on Saturday, these steadily transferring east through the morning and early afternoon. The winds initially southwesterly will gradually turn westerly later whilst also slowly easing. Gusts exceeding 50 mph are expected widely within the warning area, with gusts of around 70 mph along exposed coastal areas. These are expected to coincide with high tides, leading to locally dangerous conditions around the coast. This warning has been updated to now include coastal parts of northwest England and has also been extended further north over central England.

Rhybudd Llifogydd

Rhybudd gan Asiantaeth yr Amgylchedd neu gan SEPA yn yr Alban a Chyfoeth Naturiol Cymru yng Nghymru

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

Wednesday 18 October

There are no flood warnings in force anywhere in the United Kingdom.

Ynglŷn â Rhybuddion Tywydd y Swyddfa Dywydd

Mae’r Swyddfa Dywydd yn rhybuddio’r cyhoedd a’r rhai sy’n ymateb i argyfyngau o dywydd garw ac enbyd a allai fod yn beryglus i fywyd neu a allai gael effaith eang, drwy’r Gwasanaeth Rhybudd Tywydd Garw Cenedlaethol (NSWWS).

Mae’r Swyddfa Dywydd yn darparu rhybuddion am law, eira, gwynt, niwl a rhew. Bydd lliw yn cael ei roi i bob rhybudd, yn dibynnu ar gyfuniad o debygrwydd hyn yn digwydd a’r effaith gallai ei gael.

Am fwy o wybodaeth, darllenwch Ganllaw Rhybuddion Tywydd y Swyddfa Dywydd (dolen Saesneg).

Ynglŷn â Rhybuddion Llifogydd

Mae’r rhybuddion llifogydd yn cael eu cyhoeddi gan Asiantaeth yr Amgylchedd, Scottish Environment Protection Agency a Chyfoeth Naturiol Cymru, a’u hanfon at Ganolfan Dywydd y BBC. Yna rydyn ni'n cyhoeddi crynodeb o rybuddion wedi eu seilio ar y wybodaeth ddiweddaraf sydd ar gael. Pan mae rhybuddion llifogydd difrifol yn cael eu rhyddhau, bydd rhain yn cael pwyslais ar ddarllediadau teledu.

Dysgwch mwy am Rybuddion Llifogydd

Mae yna nifer o ffyrdd y gallwch chi ddarganfod os yw eich ardal chi mewn perygl o lifogydd. Mae Asiantaeth yr Amgylchedd, Scottish Environment Protection Agency a Chyfoeth Naturiol Cymru yn diweddaru eu rhybuddion 24 awr y dydd trwy rif Floodline.

Floodline - 0345 988 1188

Rhagolwg Misol

Llun 16 Hydref Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Very unsettled start - sign of a drier spell later

The first fortnight of October has seen some pleasant warm weather in the southeastern half of the UK, where it has also been very dry so far, but the northwest has been much wetter: Capel Curig in Snowdonia has recorded 255 mm of rainfall already. Even the southeast will see some significant rain during the next fortnight but there are signs of a more settled weather pattern returning later in the period.

Llun 16 Hydref—Sul 22 Hydref
Stormy start - more wind and rain later

The second half of the month begins with ex-hurricane Ophelia bringing a stormy day. Severe gales will spread to western coastal parts, with some disruption likely and gales will develop in many other inland areas later. At the same time, eastern England will be warm and bright. Gales will continue into Tuesday morning over the northern half of the UK but will decrease steadily. The south will have another mainly dry, bright and rather warm day while the north is cloudy with some showers. On Wednesday, most areas will be cloudy and there'll be some patchy, mainly light rain around. The second half of the week will turn very unsettled everywhere, with bands of rain crossing all parts, and there's the potential for further very windy episodes. Temperatures will also drop back towards average.

Llun 23 Hydref—Sul 29 Hydref
Unsettled start and turning cooler

The last full week of October will begin on a very unsettled note. There will be periods of rain and some strong winds likely. The week's weather will keep an unsettled flavour but there will be lengthier drier, clearer periods as the week goes on. Should the winds fall light overnight, a couple of cold starts are likely, with local frost and patchy fog but rain and wind are likely to return for a time especially to the northwest.

Llun 30 Hydref—Sul 12 Tachwedd
Prospect of some settled autumnal weather

Heading into early November, the weather pattern looks set to remain in a rather unsettled mood, with occasional spells of wind and rain but also some drier and brighter intervals. As the fortnight goes on, so a more settled spell is expected to develop although the northwest may hang on to mild conditions with cloudy, breezy weather and some rain. Elsewhere, higher pressure promises a much drier period with lighter winds and it will turn rather chilly at times. Overnight fog and frost will also become much more likely.

Wythnos nesaf

The change to more settled weather is far from certain, will we see frost and fog set the tone for early November?

Rhagolygu Misol
Mae rhagolygu’r tywydd hirach nag wythnos ymlaen llaw yn her i hyd yn oed yr arbenigwr tywydd mwyaf profiadol. Mae modelau rhagolwg rhifiadol y tywydd gan y Swyddfa Dywydd a'r Ganolfan Ewropeaidd ar gyfer Rhagolygon Tywydd Ystod-Canolig (ECMWF) yn cael eu rhedeg nifer o weithiau'r mis (a'r tymor) i ddod, er mwyn dyfalu sut dywydd fydd yn effeithio ar y DU.

Diweddariad nesaf am 10:00, Llun 23 Hydref

Crynodeb

Iau 19 Hydref Cyhoeddwyd am 01:35

Crynodeb

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

Some rain for central parts, and in the west later.
Today

Although there will be some dry and bright weather, rain will affect northern and some central parts through the day. Heavy rain expected in the Northern Ireland and other western parts this afternoon, with coastal gales developing in the southwest.

Tonight

Cloudy and windy with spells of rain, some of this heavy at first. The rain will become lighter during the early hours with the wind slowly easing too.

Friday

Rain across central and southern parts will clear slowly through the day leaving a good deal of dry and bright weather. Further rain will spread into the west by evening.

Outlook for Saturday to Monday

Very unsettled on Saturday with rain and strong to gale force winds. Winds slowly ease on Sunday with a mix of sunshine and showers. Further rain is expected on Monday.

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