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Rhybuddion

Llun 27 Mehefin Cyhoeddwyd am 17:45

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Monday 27 June

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.

Monday 27 June

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 27 Mehefin Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
An unsettled end to June, so what will July bring?

Last week brought a real mix of weather with some warm sunshine but also frequent thunderstorms, flash flooding and reports of funnel clouds in places. Although the week ahead doesn't look quite as lively, it is set to stay changeable with many of us seeing some rain at times before a more typical northwest-southeast split develops during the first couple of weeks in July, bringing the best of any settled spells towards the southeast.

Llun 27 Mehefin—Sul 3 Gorffennaf
A mixed bag for all this week

Wimbledon starts this week on a dry and bright note, but northern areas are likely to see some showers in places. From Tuesday onwards we are likely to see spells of rain move eastwards across the country at times, but in-between there will be some sunnier interludes. The heaviest of the rain is always likely to the west, where it will be windy at times too, with the southeast seeing the best of any drier and brighter weather. Temperatures are likely to be close to the seasonal average, so certainly a contrast to this time last year when we experienced the hottest July day on record, with 36.7C recorded at Heathrow on 1st July last year.

Llun 4 Gorffennaf—Sul 10 Gorffennaf
Wimbledon continues, but will the sun shine?

As we head into the first full week of July we see plenty of fetes and festivals taking place across the UK, including T in the Park in Perthshire. At the moment we can expect the changeable theme to continue across the UK. The most frequent spells of rain are likely towards the northwest with the southeast seeing the best of the drier and brighter weather. In the strong July sunshine it will feel warm but under the rain it will tend to feel rather cool for the time of year.

Llun 11 Gorffennaf—Sul 31 Gorffennaf
Any signs of the weather settling down?

At first, the changeable theme seems set to continue, with the northwest seeing the most unsettled weather whilst the best of the drier and brighter conditions remain closer to the southeast. We may see a more settled spell of weather develop for a time across the UK bringing some warmer and more humid conditions, especially in the south but this in turn may trigger a few thunderstorms.

Wythnos nesaf

As we approach the summer holidays, will the temperatures begin to rise?

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 4 Gorffennaf

Crynodeb

Llun 27 Mehefin Cyhoeddwyd am 15:41

Crynodeb

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

Rain spreading in from the southwest through Tuesday.
This Evening and Tonight

Showers in the north will become confined to northern and western Scotland overnight leaving much of the country dry with clear spells. It will turn fairly cool in rural areas.

Tuesday

After a bright start, rain will gradually push northeastwards across England and Wales with strong winds developing across southwestern coasts. Elsewhere, showers will become more frequent through the day.

Outlook for Wednesday to Friday

Unsettled and generally fairly cool through the period with showers or longer spells of rain, interspersed by drier and brighter interludes. It will often be windy, especially across southwestern coasts.

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