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Rhybuddion

Gwener 29 Mai Cyhoeddwyd am 15:11

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Friday 29 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.

Friday 29 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 25 Mai Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Summer arriving, but where is the summery weather?

April 2015 proved to be a lot warmer than an average April for the vast majority of the UK, and also the sunniest April since records began way back in 1929. In stark contrast, May 2015 has so far proven to be a relatively cool month, with daytime temperatures well below where they should be for most. The first half of May 2015 also proved to be particularly wet, with most places in the UK receiving the average rainfall for the entire month in just the first two weeks.

The week just passed brought further spells of rain. So as we head through the last week of May and into June (the start of the meteorological summer), is there any change on the horizon from the cool and showery theme of late?

Well, in short, in the near term the answer is no. The last week of May looks like remaining a touch on the cool side, particularly in the north, and will turn quite wet and windy for a time on Thursday and into the weekend. Further ahead though there are suggestions of a slight change in the weather.

Read on to find out the details...

Llun 25 Mai—Sul 31 Mai
The cool theme continues...for some at least

This week gets underway on a dry and cloudy note. There will be the risk of a few showers across northern parts, but on the whole most places will stay dry. Temperatures will be a little on the cool side under the cloudy skies, but in the brighter intervals across eastern areas, temperatures will peak into the high teens. A similar theme is expected for Tuesday and the first part of Wednesday.

Later on Wednesday an Atlantic low pressure system will bring outbreaks of rain and gusty winds into Northern Ireland. Overnight into Thursday morning, this weather system is expected to track northeastwards, bringing wet and windy weather to all parts of the UK for a time.

On current forecast timings, we expect this low pressure system to have cleared away into the North Sea by Thursday afternoon, but a legacy of heavy, potentially thundery showers and strong northwesterly winds are expected in its wake.

Conditions should then settle down for a time as we move into Friday, but further Atlantic weather systems are expected to move in from the west through the course of Friday and into the weekend. Southeastern parts may stay drier and warmer at times, but the cool showery theme will continue in the northwest.

Llun 1 Mehefin—Sul 7 Mehefin
Flaming June? Not likely...at least for start

The meteorological summer looks set to get off to a relatively breezy start in the north, with a risk of further Atlantic low pressure systems tracking northeastwards to bring spells of rain and some fairly strong winds at times. The combinations of these elements will likely lead to temperatures registering at values rather lower than what we would usually expect for early June, (the early-June average in the north of the UK being 15 to 16C).

Further south though, there is a greater chance that conditions will tend to stay drier for longer, with temperatures reaching values nearer to what we would normally expect during June (18 to 19C as the early-June average in the south of the country), particularly in any brighter daytime interludes.

Towards the end of this period, confidence in the forecast tethers off somewhat. However, there are signs that we could see pressure rise across much of the UK though, which would in turn increase the likelihood of dry weather for all parts, with a recovery in daytime maxima in the previously cooler north.

Llun 8 Mehefin—Sul 21 Mehefin
Lots of uncertainty, but at least a hint of summer

Even for a long range forecast, the current prospects for the second week of June exhibit a relatively large amount of uncertainty. There is little sign of any genuine consensus between all the computer models and weather forecasting tools available to us. However, there are some hints that pressure might start to build across Scandinavia. Such a scenario would have the effect of introducing a good deal of dry and bright weather, particularly across northwestern parts of the UK.

High pressure lying to the northeast of the UK also creates favourable conditions for a warm feed of continental air across southern parts of the UK, with the potential for some thundery showers to feed in from the near continent. At this stage we cannot be too certain of such an anti-cyclonic outcome. We await further forecast information with interest, and of course we will always keep you updated here at BBC Weather Centre.

Wythnos nesaf

Will the summer weather show up? Find out next week!...

Rhagolygu Misol
Mae'r tywydd y tu hwnt i'r wythnos i ddod yn herio hyd yn oed yr arbenigwr tywydd mwyaf profiadol. Mae modelau rhagolwg rhifiadol y tywydd o'r 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 creu darlun o'r tebygoliaeth o'r gwahanol fathau o dywydd fydd yn effeithio'r DU.

Diweddariad nesaf am 10:00, Llun 1 Mehefin

Crynodeb

Sadwrn 30 Mai Cyhoeddwyd am 16:36

Crynodeb

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

Rain spreading from the southwest to most areas overnight.
This Evening and Tonight

Cloud and rain, already affecting Wales and SW England will move northeast through this evening and overnight to reach all but Northern and Eastern Scotland by dawn. Winds will strengthen across England and Wales.

Sunday

Rain clearing to sunny spells by afternoon across all but the far north-east. However, it will be breezy with blustery showers in many places, some heavy. Gales in NW.

Outlook for Monday to Wednesday

Bright with a few showers at first on Monday but turning wet and windy later. Very windy with sunshine and showers on Tuesday. Drier and feeling warmer on Wednesday.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 21:05, Sadwrn 30 Mai Mae’r fideo yma ar gael yn Saesneg yn unig.