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Rhybuddion

Llun 20 Ebrill Cyhoeddwyd am 00:01

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Monday 20 April

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 20 April

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 20 Ebrill Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
The weather is certainly springing around!

Last week the UK saw a range of weather conditions that typify spring in this part of the world. Through the first half of the week, some parts of western Scotland saw well over 100 millimetres of rain (that's around 4 inches) whilst southern England and Wales simultaneously enjoyed warm, sunny days with temperatures peaking into the high teens or low twenties. In fact, last Wednesday brought the highest temperature observed anywhere in the UK so far this year, with Frittenden in Kent recording 25.1 Celsius during that
afternoon. That said, even in the warmer regime across southern areas, early morning mist and fog made for a cool and dull start for many. Interestingly, some of the same areas of the country that experienced warm daytime conditions were also affected by overnight frosts! With winds strengthening across eastern parts of the UK by the end of the week, we really did cover a lot of bases in terms of weather types through the course of last week!

So what type of weather should we expect across the UK over the coming weeks? In short, the answer is; a similarly wide range of weather conditions like those observed last week! This week looks as if the high pressure that has brought a lot of dry and settled conditions in recent days will gradually give way to a wetter and windier spell by the weekend. The following week looks like being an unsettled affair, and perhaps a little cooler than we might expect. Beyond that, there is a fair amount of uncertainty in the forecast, but a reasonably vernal mix looks most likely to persist well into the start of May.

Read on to find out the details...

Llun 20 Ebrill—Sul 26 Ebrill
Mostly dry and calm at first but changes afoot.

A dominant anticyclone brought a dry and sunny Saturday for all parts of the UK, but by Sunday, a week weather system drifted across central and northern parts to bring cloudy skies and a few spots of rain. Monday started with the remnants of that system clearing away to the northwest, with a fine and dry afternoon expected to follow for the UK at large.

High pressure is indeed expected to retake firm control over the UK weather again for the majority of the week, with an anticyclone centred over or just to the north of the UK. This set-up should bring a lot of fine and dry weather by day. Temperatures are expected to climb gradually day by day, with highs across western areas peaking in the high teens by mid to late week. That said, with the high being centred to the north of the UK, it's most likely that winds will be predominantly from the northeast, such that eastern parts of the UK will tend to be on the cloudier side at times, and some North Sea coasts could be a little on the chilly side at times. With plenty of clear sky around, the overnight periods could be a bit chilly too, particularly across northwestern parts of the UK, where a touch of frost is likely across rural locations overnight.

As we move towards the end of the week the dominant high is expected to gradually give way weather systems to encroaching from the southwest, and also the northwest. This means that as we move into the weekend, we can expect wetter and windier conditions to gradually take over for most areas, with daytime highs significantly down in comparison to midweek.

Llun 27 Ebrill—Sul 3 Mai
A typical April week, with showers as standard

April is expected to end on a changeable note, which is exactly the sort of weather we'd usually expect to see at this time of year! Current forecast trends suggest that the jet stream will be suitably positioned to drive some fairly showery conditions in off the Atlantic. This means that the most likely scenario is for all areas to see some wet and windy weather from time to time through the course of this period. The most frequent and heaviest showers are likely to be across western parts of the UK, with the best chance of any prolonged drier interludes to be across southeast England. Most places should see a fair amount of spring sunshine in between the showery bands though. Although daytime maximum temperatures are expected to be at around the average or perhaps just a touch below for late April/early May, there is a reasonable chance that, should winds fall light during overnight periods, a touch of frost will form across rural locations.

Llun 4 Mai—Sul 17 Mai
April showers bring forth...May showers (probably)

Moving into the longer range period, we usually expect the confidence in the forecast to diminish to a certain degree. However, that confidence level is particularly low moving into the first part of May, with different computer model forecasts giving a wide range of very different solutions. As a result, there is a good deal of uncertainty regarding the weather conditions expected over the UK during this period. However, there are just some indications which suggest a continuation of the changeable conditions we anticipate for the end of April. As always, we'll keep you posted.

Wythnos nesaf

Edging towards summer, can we expect any warmth to come our way in late May? 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 27 Ebrill

Crynodeb

Mawrth 21 Ebrill Cyhoeddwyd am 04:42

Crynodeb

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

Many places dry and warm with plenty of sunshine.
Today

Low cloud and patchy fog across eastern parts of England will soon lift and break, leaving most places warm and dry with long sunny spells. However, the far north of Scotland will turn cloudier with a little rain.

Tonight

It will be chilly for many with clear periods, although probably somewhat cloudier across parts of northern and eastern Britain. A little rain is possible across the far north.

Wednesday

Warm and dry for most again but with a little more cloud around than recently. The best of the sunshine will be across western Britain.

Outlook for Thursday to Saturday

Mostly fine on Thursday. More unsettled on Friday and Saturday, with fresher winds, outbreaks of rain and heavy showers at times. Some sunshine is still likely though.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 07:43, Mawrth 21 Ebr Mae’r fideo yma ar gael yn Saesneg yn unig.