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Rhybuddion

Sul 20 Ebrill Cyhoeddwyd am 00:12

Rhybuddion DU

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

Rhybudd Tywydd

Issued by the Met Office

Sunday 20 April

There are no weather warnings in force anywhere in the United Kingdom.

Rhybudd Llifogydd

Issued by the Environment Agency (or by SEPA in Scotland)

Sunday 20 April

There are no flood warnings in force anywhere in the United Kingdom.

Am Rybuddion Tywydd y Swyddfa Dywydd

Mae BBC Tywydd yn darparu dau fath o rybuddion tywydd a ddosbarthwyd gan y Swyddfa Dywydd: Rhybuddion a Rhybuddion cynnar.

Pan disgwylir tywydd garw, bydd Rhybuddion yn cael eu cyhoeddi o fewn y 24 awr nesaf.

Bydd Rhybuddion cynnar yn cael eu cyhoeddi mwy na 24 awr o flaen tywydd garw.

Mae yna dri categori o ddigwyddiad: Coch, Ambr a Melyn-y mwyaf difrifol yw Coch.

Mae Rhybudd a Rhybudd Cynnar sydd â'r un lliw yr un mor ddifrifol ond 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 manwl ar Rybuddion Tywydd y Swyddfa Dywydd.

Am Rybuddion Llifogydd yr Asiantaeth Amgylchedd

Cyhoeddwyd y Rhybuddion Llifogydd gan yr Asiantaeth Amgylchedd ac Asiantaeth Gwarchod Amgylchfyd yr Alban a danfonwyd nhw i Ganolfan Dywydd y BBC. Rydym ni'n cyhoeddi crynodeb o rybuddion wedi eu seilio ar y gwybodaeth diweddaraf 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 ddarganfod os mae'ch ardal chi mewn perygl o orlifo. Mae'r Asiantaeth Amgylchedd (ar gyfer Lloegr a Chymru) ac Asiantaeth Gwarchod Amgylchfyd yr Alban yn diweddaru eu rhybuddion 24 awr y dydd trwy rif.

Floodline - 0845 988 1188

Rhagolwg Misol

Llun 14 Ebrill Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
A good month ahead?

After a wet start to last week, conditions calmed down considerably with an area of high pressure pushing in from the west. This week we have a ridge of high pressure persisting over the UK with plenty of brightness by day but a patchy rural grass frost by night. The question though, is how long will the high pressure last? Read on to find out more...

Llun 14 Ebrill—Sul 20 Ebrill
High pressure firmly in charge of the weather

High pressure has been flirting with the UK over the past few days, and it looks as though it will continue to dictate the weather this week. Monday and Tuesday's forecasts look promising for all with high pressure in charge; patchy cloud with plenty of clearer spells means some sunshine should be on the cards for everyone. Northern Scotland may see a couple of showers through Monday, but these should be light and few and far between with a dry day for almost all. With clear skies through the night, we keep the risk of a grass frost overnight. The high pressure slowly drifts eastwards through the middle part of the week, so although England and Wales should hold on to fine weather with sunny spells, cloudier conditions with outbreaks of rain will gradually be introduced to Scotland and Northern Ireland. By the start of the Bank holiday though, high pressure should have re-established itself over the UK. The weekend looks fairly cloudy but mostly dry; the greatest risk of rain will be in western areas with thicker cloud. Temperatures on the whole are expected to be slightly above the seasonal norm for all.

Llun 21 Ebrill—Sul 27 Ebrill
High pressure just holding on

Moving further ahead in the forecast it appears that the influence of high pressure over the UK will not relinquish. With the ridge sitting to the west of the UK a cool north-westerly airflow can be expected, therefore temperatures are expected to be on a downward trend, slightly below the seasonal norm. Scotland and Northern Ireland look likely to see the most rain with systems pushing down from the northwest; these should weaken as they head to the southeast, giving drier conditions for England and Wales.

Llun 28 Ebrill—Sul 11 Mai
High pressure finally easing away

As we move into May it looks like we are finally set to bid farewell to high pressure. The ridge looks to be replaced with areas of low pressure swinging in from the Atlantic bringing periods of rain for all. Temperatures remaining fairly cool; sitting just below the seasonal average.

Wythnos nesaf

Looking further into May - what will the forecast have for us?

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 21 Ebrill

Crynodeb

Sul 20 Ebrill Cyhoeddwyd am 15:36

Crynodeb

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

Rain easing tonight, then sunny spells for many on Monday.
This Evening and Tonight

Rain will continue northwest across southern England and Wales, but turn more showery. It will stay cloudy in eastern Britain with patchy drizzle, and clear with low temperatures in the northwest. Winds will ease too.

Monday

Sunny spells developing for many and warmer than Sunday, but cloudier and drizzly in northeastern Britain. Showers across southern areas including Wales, perhaps thundery. Breezy in central and northern parts.

Outlook for Tuesday to Thursday

Remaining generally unsettled throughout, with showers or longer spells of rain on Tuesday and Thursday. Some drier spells are also possible. More prolonged rain moving across the UK on Wednesday.

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UK Fideo Rhagolwg

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