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Rhybuddion

Mercher 4 Mai Cyhoeddwyd am 05:45

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Wednesday 4 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 4 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 2 Mai Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Is winter over yet?!

It was another blustery week of weather across the UK with rain, hail, sleet and even snow! Yet, if you were out of the breeze and in the sunshine, it did actually feel a little like spring, and by the end of the week it may actually start to feel like summer (well for some of us)!
Last week our weather was dominated by a northerly pattern which brought a continued spell of below-average temperatures, but this week our weather has more of a southerly and westerly influence and this means that are temperatures will start to creep back up.

Llun 2 Mai—Sul 8 Mai
Some signs of summer!?

On Monday, the south east will start off on a damp note as rain moves south-eastwards. Behind the rain there will be sunshine and scattered showers but the showers will be mainly focused across the western half of the UK. We'll see sunny spells and some further showers during Tuesday and Wednesday and, as our winds will be westerly, we will see day on day improvement in temperatures. A mainly dry day on Thursday with temperatures approaching the mid-teens in the north and near twenties in the south, although Northern Ireland and the far north west of Scotland will be breezier with patchy rain. Dry and warmer for much of the UK on Friday as our winds start to become southerly. This will draw warmer air from the continent and and while most of the country will see temperatures in the mid-teens, the south may see temperatures closer to twenty Celsius. As we head into next weekend, the southerly influence will mean there is a risk of drawing thundery showers across the southern half of the UK. There is still a lot of model discrepancy as to what will happen across the northern half of the UK, but, at the time of writing, it looks there will be the risk of showers continuing to travel northwards.

Llun 9 Mai—Sul 15 Mai
Have we finally said farewell to winter?

As we head into the second week of May, our computers models are emerging with a pattern of south or south-easterly wind direction. This can lead to quite a varied weather pattern from unsettled with showers and rain to dry and fine conditions. What this wind direction also indicates is that there will be rather warm conditions in the south at times, with this warmer air sometimes extending northwards across the rest of the UK.

Llun 16 Mai—Sul 29 Mai
A northwest / southeast split?

Towards the end of May it is no surprise to know at this extended range there is quite a variety of weather patterns emerging from the various computer models. At this stage, the dominant wind direction is expected to be from the west or southwest, which would indicate lower pressure to the north and west of the UK and higher pressure to the south and east of the UK, the latter being where we are most likely to see the driest and at times warmest conditions.

Wythnos nesaf

So will this signal for a divide continue as we head into summer?

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 9 Mai

Crynodeb

Mercher 4 Mai Cyhoeddwyd am 02:35

Crynodeb

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

Dry with sunny spells for most. Feeling warmer.
Today

After a chilly start, most places will have a fine and dry day with plenty of warm sunshine. However, cloud and outbreaks of rain will slowly spread southeastwards across parts of Scotland and Northern Ireland as the day progresses.

Tonight

Patchy rain will continue to spread south into northern England, with clear spells following and with some showers possible in the far northwest. Elsewhere will be dry with clear skies.

Thursday

Most places will be fine and dry, with plenty of warm sunshine, albeit rather hazy at times. Thicker cloud with outbreaks of rain possible across the far northwest of Scotland.

Outlook for Friday to Sunday

Fine and warm for most on Friday with the odd shower possible across northern Scotland. Staying warm into the weekend, but an increasing risk of some thundery showers developing.

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Fideo Rhagolwg: DU

Rhagolwg: DU Diweddarwyd 07:44, Mercher 4 Mai Mae’r fideo yma ar gael yn Saesneg yn unig.