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Rhybuddion

Llun 22 Mai Cyhoeddwyd am 00:06

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Monday 22 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.

Monday 22 May

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 22 Mai Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Warming up, but for how long?

After several weeks of very dry weather for many parts of the UK, last week finally brought some persistent rainfall. Some southeastern parts of England and eastern areas of Scotland had recorded just a few millimetres of rain in well over a month. But active frontal systems and troughs brought accumulations of a good 50 to 70 millimetres (around 2 to 3 inches) of rain in just a few days.

In contrast, we also saw the highest temperature of the year so far recorded at Gravesend in Kent on Tuesday, with a maximum temperature of 25.8 Celsius.

This week, with high pressure dominating UK weather conditions, warm air moving across the UK from the south will mean that temperatures reach the low to mid twenties across much of the UK, and by the end of the week we're likely to see highs reaching the high twenties across southeastern parts, so most of us will see an early taste of summer! Just how long the warm spell lasts remains rather uncertain though as we move through the Bank Holiday weekend and on into early June.

Read on to find out the details ...

Llun 22 Mai—Sul 28 Mai
An early taste of summer!

The week will begin on a rather cloudy note across Northern Ireland and Scotland, as a weak Atlantic weather front moves north and east across the respective countries, bringing some rain at times through Monday. Elsewhere though, a bright day is in store with some good spells of sunshine allowing temperatures to climb into the low twenties, with a high of around 25 Celsius likely across parts of southeast England.

Overnight into Tuesday, skies will be largely clear, allowing a few patches of fog to form in rural locations. Tuesday will bring another (albeit weaker) weather front to some northwestern areas of the UK through the day, and some cloudier skies to western and southwestern coastal areas at times, but conditions further east will again be warm and bright for much of the time.

By midweek, an anticyclone will be centered right over the UK, ensuring that the majority of the UK see plenty of dry and bright weather, and it will feel very warm in any afternoon sunshine. The possible exception will be some western coastal parts that will be a little cloudier at times. Thursday and Friday will likely be the warmest days of the week, with temperatures reaching the highest values since the warm spell of last September. Highs into the high twenties of Celsius are probable across central and eastern parts.

As we move into the Bank Holiday weekend, considerable uncertainty starts to creep into the forecast. At time of writing, the main computer forecasting models were struggling to reach a consensus on the behavior of an Atlantic low that is likely to slowly drift in from the southwest to bring showers at times and also a transition to less warm conditions. The speed at which this transition occurs remains in doubt, but it does look as if weather conditions through the weekend will gradually tend to become more unsettled. Watch this space!

Llun 29 Mai—Sul 4 Mehefin
Not so flaming June.

The uncertainty in the forecast for the Bank Holiday weekend does spill over into the last few days of May. That said, the latest estimates using the array of forecasting tools and models at our disposal suggest that although the Bank Holiday week will likely begin on a warm note, the aforementioned Atlantic low will eventually clear away to the east, leaving much of the UK in a showery regime, with a generally fresher feeling westerly wind. To that effect, it is looking likely that the first few days of June (and the climatological summer) will begin on a fairly unsettled note, with northwestern areas experiencing the wettest and windiest conditions. Conversely though, southeastern areas will likely be drier for longer periods, with generally less showers.

Llun 5 Mehefin—Sul 18 Mehefin
Turning a little warmer and drier again?

As we move into he middle part of June, there is still a relatively large degree of uncertainty in the forecast detail, even for a longer range forecast. However, the latest available information does suggest that the jet stream will begin to realign to allow pressure to build in the vicinity of the UK again. Such a scenario would permit a good deal of dry weather, and temperatures at around average or just above for the time of year.

Wythnos nesaf

Looking further ahead into June, are there any signs of lengthy warm spells on the horizon? Find out next week ...

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 29 Mai

Crynodeb

Llun 22 Mai Cyhoeddwyd am 01:37

Crynodeb

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

Turning drier, brighter and warmer this week.
Today

Starting mild but remaining dry across England and Wales with some sunny spells, best in the south although high cloud will turn the sunshine hazy at times. Thicker cloud will bring some rain for Northern Ireland and Scotland. Feeling warm.

Tonight

Rain will clear the north through this evening, leaving a mostly dry night with some clear spells. Turning cloudier from the west during the early hours. Staying mild for most.

Tuesday

Staying largely dry with the best of the sunshine across central and eastern parts, but light rain for Scotland. Cloudier towards the southwest with some sea fog. Cooler than today.

Outlook for Wednesday to Friday

Warmer and drier through the rest of this week with increasing amounts of sunshine. Just the threat of some light rain across the northwest. Feeling warm or hot by Friday.

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