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Rhybuddion

Iau 8 Rhagfyr Cyhoeddwyd am 00:06

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Thursday 8 December

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.

Thursday 8 December

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 5 Rhagfyr Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Will the year end on a chilly note?

With the chilly temperatures we've had across the country over the last week, you would be forgiven for forgetting that autumn only ended a few days ago. However, the statistics are in and it's official - autumn 2016 was drier, sunnier and a little warmer than average! September 2016 in particular was among the three warmest Septembers on record. Although we did have some wet and windy weather, on average it has been dry, with Scotland only receiving 67% of its normal rainfall total. Also, we've seen more sunshine than average with Scotland having one of the top five sunniest autumns on record.

Llun 5 Rhagfyr—Sul 11 Rhagfyr
Becoming unusually mild.

The high pressure which has delivered cold conditions for the very beginning of winter, quickly gives way to low pressure this week. This change is going to allow warmer air to move in from the Atlantic. Though Monday morning starts cold and frosty for many, mild air moves in slowly from the far south west on Monday morning, spreading to all parts by late on Tuesday. As temperatures creep up, mist and fog is expected to develop widely, with murky conditions expected for many particularly on Monday, Tuesday and Wednesday. By Wednesday, wet and windy weather arrives in Northern Ireland and Scotland and gradually moves south, with clearer, cooler conditions following in behind on Thursday. Another spell of wet and windy weather arrives in the west on Friday and crosses all parts before clearing to the east of the UK on Saturday leaving Sunday relatively dry and bright.

Llun 12 Rhagfyr—Sul 18 Rhagfyr
Keep an umbrella handy

As we move into mid-December, unsettled conditions are expected to continue. The wettest and windiest weather will tend to be in the north and west, with southern and eastern areas seeing drier and brighter weather. This somewhat changeable weather is then likely to be replaced by more settled conditions as pressure builds by the end of the week. Temperatures return to something closer to normal, which is chilly as we approach the shortest day of the year.

Llun 19 Rhagfyr—Sul 1 Ionawr
Will Christmas be white?

Whilst there is some uncertainty surrounding this period, I'm sure you're keen to know if we're expecting a white Christmas! Currently, it is most likely that the pressure will continue to build toward the end of December, leading to a continuation of settled conditions. If the pressure does build then we can expect it to be drier than average for most areas with light winds. Temperatures are also then likely to be below average with sharp frosts and some fog around in the morning where skies clear overnight. There will also be plenty of crisp winter sunshine by day. There is the potential for some unsettled weather, but this looks less likely. So, although the Christmas period looks likely to be cold, it's unlikely to be white, but things could still change, so keep an eye on the forecast.

Wythnos nesaf

Will it be a frosty start to 2017?

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 12 Rhagfyr

Crynodeb

Iau 8 Rhagfyr Cyhoeddwyd am 00:38

Crynodeb

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

Mild, cloudy and wet in the south. Drier, brighter elsewhere.
Today

Locally heavy rain will move eastwards across northern England and Wales, leaving very mild and cloudy conditions with occasional light rain or drizzle for Wales, central and southern England. Drier with bright spells elsewhere, where it'll be less mild.

Tonight

Cloudy with hill fog and some patchy drizzle in the south. Increasingly cloudy in the north, with rain in the north-west later. Mild in the south, colder in the north.

Friday

Rain in the north-west moves slowly south-eastwards to lie across many northern, western and some central parts later. Very mild and windy for many with gales in the north-west.

Outlook for Saturday to Monday

Bright for many on Saturday and Sunday, but rain persisting in the south on Saturday. Windy with showers in the north. Further rain possible in the north-west Monday, drier elsewhere.

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