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Rhybuddion

Mercher 25 Mai Cyhoeddwyd am 00:09

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Wednesday 25 May

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

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 25 May

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

Ynglŷn â Rhybuddion Tywydd y Swyddfa Dywydd

Mae BBC Tywydd yn darparu dau fath o rybudd tywydd gan y Swyddfa Dywydd: Rhybuddion a Rhybuddion Cynnar.

Bydd Rhybuddion yn cael eu cyhoeddi pan disgwylir tywydd garw o fewn y 24 awr nesaf.

Bydd Rhybuddion Cynnar yn cael eu cyhoeddi mwy na 24 awr cyn tywydd garw.

Mae yna dri chategori o ddigwyddiad: Coch, Ambr a Melyn – y mwyaf difrifol yw Coch.

Mae Rhybudd a Rhybudd Cynnar yr un lliw yr un mor ddifrifol â’i gilydd ond eu bod wedi eu darogan i gyrraedd ar adegau gwahanol. Felly, y gwahaniaeth rhwng Rhybudd Coch a Rhybudd Coch Cynnar yw amseriad y digwyddiad.

Pan mae rhybudd mewn grym, ceir gwybodaeth lawn yn Rhybuddion Tywydd y Swyddfa Dywydd (dolen allanol 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 23 Mai Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Some early summer warmth may trigger thunder

The past week has seen a bout of unsettled weather, with low pressure areas and fronts moving in from the Atlantic but, typically for May, this isn't going to be sustained. For the week ahead we'll be eyeing up weather systems approaching from the south and east for the UK's weather.

Llun 23 Mai—Sul 29 Mai
Slowly warming up but with thundery rain possible

The new week starts off with Monday being another day of some pleasant sunshine after a chilly start but with a few heavy showers breaking out by the afternoon. Most of the showers will be in central and south-eastern parts of England, where there may be a few thunderstorms among them. Tuesday will be a mainly dry day, with only southwest England seeing a few sharp showers. Eastern counties will be cooler and more cloudy, while most places see some sunny intervals. By Wednesday there's a threat of rain moving westwards from the North Sea. So after a dry start, many northern and eastern areas can expect a lot of cloud and some outbreaks of rain in the afternoon, and it will be quite cool again.

Later in the week, things should start to warm up slowly: for Thursday, there will be sunny intervals and a scattered showers developing almost anywhere. For Friday and Saturday parts of England and Wales can expect some heavy, thundery downpours punctuating some warm sunshine. Scotland and Northern Ireland should see the brightest, driest weather but with temperatures nearer normal.

Llun 30 Mai—Sul 5 Mehefin
Bank holiday! Washout or picnic?

The week begins with the Spring bank holiday and current signs are promising: many parts of the country should be warm and have some sunshine. While many places stay dry, localised thundery showers may spoil the afternoon and evening in parts of England in particular. This type of weather will probably prevail through the week as June starts: it is likely to stay quite warm, especially in the south, while the afternoons will see scattered showers and a few thunderstorms. Conditions on the near continent will probably favour the development of areas of thundery rain, and it can't be ruled out that a few longer outbreaks of heavy rain could spread over from mainland Europe.

Llun 6 Mehefin—Sul 19 Mehefin
Dry spells to prevail

Looking ahead to the central fortnight of June, and we can only talk of trends in the weather compared to the average. The indications at the moment suggest high pressure will be in charge of the weather pattern over the British Isles for much of this period. This translates into a good deal of dry weather with some sunshine, and with temperatures often on the warm side. For some days, showers and perhaps the odd thunderstorm may be triggered during the day, while a short spell of westerly winds and more unsettled weather cannot be ruled out. Overall, northwestern parts are expected to have the longest dry spells, and will therefore have below average rainfall, while southern and southwestern parts have the higher temperatures but also the higher risk of the showery outbreaks.

Wythnos nesaf

Is June still shaping up to be a pleasant summer month?

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 30 Mai

Crynodeb

Mercher 25 Mai Cyhoeddwyd am 15:09

Crynodeb

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

Variable cloud with rain in places.
This Evening and Tonight

Rain across northern England, north Wales and the Midlands will spread into southern Scotland and Northern Ireland overnight, becoming lighter and patchier by dawn. Elsewhere will be largely dry with variable cloud and clear spells.

Thursday

Northern Ireland, southern Scotland and northern England rather cloudy with some patchy rain and hill and coastal fog. Brighter and warmer elsewhere, but scattered afternoon showers over southern England.

Outlook for Friday to Sunday

Variable cloud throughout but also plenty of sunshine. Patchy rain easing in the north, but scattered heavy afternoon showers developing in places. Generally warm, but cooler near eastern coasts.

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Fideo Rhagolwg: DU

Rhagolwg: DU Diweddarwyd 22:39, Mercher 25 Mai Mae’r fideo yma ar gael yn Saesneg yn unig.