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Rhybuddion

Gwener 22 Mai Cyhoeddwyd am 12:19

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Friday 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.

Friday 22 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 18 Mai Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Cool May continues, but will June be flaming?

After a somewhat cool and changeable spell of weather, there are signs as we head into a new month that the Azores high - a semi-permanent area of high pressure located over or near the Azores islands in the Atlantic - might start to dominate the weather a little more frequently. This should help lift temperatures back closer to average, or even a little above at times, especially in more southern parts of the UK. Before that though, this week will be showery, still on the cool side for the time of year, and often breezy. In the strong spring sunshine between showers it will feel rather pleasant, but clear skies and light winds after dark will allow chilly nights.

Llun 18 Mai—Sul 24 Mai
Rough winds do shake the darling buds of May

On Monday, following a wet start in the south and east of the UK thanks to a lively cold front, brighter conditions are following from the northwest for the rest of the day. However there are also scattered and increasingly blustery showers, some of these heavy and thundery in the north of the country. Tuesday and Wednesday will also be breezy, especially in western and southern parts. Sunshine and showers sums up these two days, though as is the nature of such convective weather days, some places will see more showers than sunshine, and other places will see more sunshine than showers. Where the showers do fall, they will again have the potential to be heavy and thundery.

High pressure moves in from the southwest on Wednesday night to settle things down for Thursday, but with weather fronts never too far away. On Thursday these will act to keep it cloudier in the north of the UK with rain at times. Friday is expected to remain cool, cloudy and breezy with some rain in the north and west, whilst southeastern parts should enjoy drier, brighter and somewhat warmer weather with temperatures here returning to nearer average for late May.

With higher pressure extending from the Azores this will tend to favour the south for a largely dry, bright and slightly warmer weekend. As weather fronts steer around the top of the high towards the north of the country, it will be comparatively cooler, breezier and showery here over the weekend.

Llun 25 Mai—Sul 31 Mai
Ne'er cast a clout...

For the last full week of May no dramatic change in weather type is expected. With the Azores high steering low pressures from the north of the North Atlantic towards Scandinavia or the Low Countries, this tends to favour cooler westerly or northwesterly winds across the UK. So the rather cool and changeable theme is likely to continue through to the end of the month, with a mix of sunshine and occasional rain. The rain will be most prevalent in the north, nearer to the passage of low pressure centres, where it is likely to be breezy at times. In the south, nearer to the influence of the Azores high, dry and bright weather is more likely to dominate, however the high pressure's dominance may still wane enough to allow rain or showers further south across the country. Temperatures will range from below normal in the north to about average in the south.

Llun 1 Mehefin—Sul 21 Mehefin
Shall I compare thee to a summer's day?

Although the first week of June looks like carrying on the themes of May, there are hints that high pressure might dominate the weather more often than not as the new month progresses. If so, we might expect a good deal of dry, warm and settled weather, particularly - as models suggest - across southern and eastern areas. Frontal systems are still likely to make inroads from the Atlantic at times, though most of the rain associated with these is likely to affect north-western areas. If high pressure does take more of a hold across the UK, temperatures should range from near normal in the north, to just above average in the south. Which means we should see a few more days with temperatures in the high teens to low twenties Celsius than we have done of late. And, as we head into the season of summer, I am sure that will be welcomed by many.

Wythnos nesaf

With summer finally here climatologically and astronomically, and some popular outdoor events looming, will the weather play ball?

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 25 Mai

Crynodeb

Sadwrn 23 Mai Cyhoeddwyd am 03:37

Crynodeb

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

Generally dry with sunny spells. Rain in the northwest later.
Today

Cloudy with some patchy light rain in the south and southeast at first. Elsewhere, a chilly start followed by a fine, dry day with sunny spells and feeling pleasantly warm. However, cloud and rain will arrive into the northwest later.

Tonight

Outbreaks of rain will move south-eastwards to lie across northern England and Wales by morning. Remaining dry and mild to the south and cooler with scattered showers to the north.

Sunday

Rain across central parts moves south-eastwards and weakens, clearing all but the far southeast by evening. Cooler, brighter conditions will follow with scattered showers affecting northwest Scotland and Northern Ireland.

Outlook for Monday to Wednesday

Many places will be dry with variable cloud and bright or sunny spells and only isolated showers. Becoming breezy in the northwest on Wednesday, perhaps with some rain or showers.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 12:25, Sadwrn 23 Mai Mae’r fideo yma ar gael yn Saesneg yn unig.