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Rhybuddion

Mawrth 27 Mehefin Cyhoeddwyd am 10:28

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

YELLOW WARNING of RAIN for Northern Ireland.

Valid between 12:00 Tue 27th and 20:00 Tue 27th.

Heavy showers will develop over parts of Northern Ireland on Tuesday afternoon. There is the potential for some disruption from the heavy rainfall as well as local hail or thunder though it is likely that many places will miss the worst.

YELLOW WARNING of RAIN for southern England.

Valid between 16:00 Tue 27th and 09:00 Wed 28th June.

There is an increasing risk of heavy rain, with thunder possible, over southern England on Tuesday afternoon before spreading northwards during the evening and overnight. Many places will miss the worst of the rain, but there is a low likelihood of flooding of homes as well as disruption to transport.

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 26 June

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 26 Mehefin Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Summer - two fine days and a thunderstorm!

This past week has given us more than a taste of summer; and in true British style it was all or nothing. On Wednesday, we saw a contrast of over 20 Celsius between a chilly 12.6 °C in Lerwick, Shetland and a much warmer 34.5 °C at Heathrow. Incidentally this also made Wednesday 21st the warmest June day since 1976 as well as the warmest Summer solstice on record! After the heat came the thunderstorms with some torrential downpours for the some, and that has left many wondering if summer has come and gone before we even realised it? Read on to find out more!

Llun 26 Mehefin—Sul 2 Gorffennaf
More of summer on the cards?

This week actually looks poised to remind us more of autumn than summer! The weather is looking very unsettled with frequent spells of rain and a few potential thunderstorms thrown in there too for good measure. The first rain bearing low pressure system will arrive slowly on Monday into Northern Ireland and spread slowly east on Tuesday. Through the remainder of the week this area of low pressure will struggle to clear the UK and will continue to draw in further areas of rain and perhaps even some thunderstorms on Wednesday. Welcome news I'm sure for gardeners and growers but perhaps not so much for those on a summer holiday!

Llun 3 Gorffennaf—Sul 9 Gorffennaf
Will the weather settle down again?

As we look further ahead in the forecast things look like they should settle down slightly, especially in the south of the UK. It is likely that the changeable weather will continue further north with areas of low pressure continuing to bring strong winds, cloud and rain. At times these low pressure systems will swing areas of rain into southern parts too, however, this will be increasingly interspersed with drier and brighter conditions. Temperatures during this time are expected to continue to be cooler than the recent record breakers but at times it could warm up again, especially in the southeast.

Llun 10 Gorffennaf—Sul 23 Gorffennaf
Finally something a little more like summer!

Looking in to mid-July the changeable weather is likely to continue in the north bringing more spells of rain and some showers too, but equally some sunnier spells in-between. The theme of seeing the driest and brightest weather in the south is also likely to continue during this period and at times these conditions may spread to all, especially later on. This would mean more sunshine and consequently higher temperatures but with an increase in temperatures the risk of some thundery outbreaks also increases.

Wythnos nesaf

Are there any more signs of the record-breaking warmth returning?

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 3 Gorffennaf

Crynodeb

Mawrth 27 Mehefin Cyhoeddwyd am 03:41

Crynodeb

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

A lot of rain
Today

Long outbreaks of heavy rain will continue in Scotland and especially in the north of England during the morning, and rain will affect most of the UK by the afternoon. Northern Ireland will become brighter though with heavy showers later.

Tonight

Rain will intensify in eastern and south-eastern England during the evening and spread across the UK overnight, though it will be lighter and less continuous in Scotland and Northern England.

Wednesday

Tomorrow will bring more spells of sometimes heavy rain, and only occasional drier and brighter spells, except in Scotland and East Anglia where rain will be less prevalent.

Outlook for Thursday to Saturday

More rain is likely on Thursday and Friday and it will feel rather cool. The north and west will become much more windy. Saturday looks like being drier for many.

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