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Rhybuddion

Sul 28 Rhagfyr Cyhoeddwyd am 03:00

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Sunday 28th December

YELLOW WARNING of ICE for the whole of the UK.

Widespread icy patches are expected to readily form on untreated surfaces during Saturday night, especially where snow cover exists or where wintry showers occur.

The public should take extra care and be aware of the possibility of some disruption to travel.

Valid until 1200 on Sunday.

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.

Sunday 28th December

There are flood warnings in force.

Anglian (1)

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 22 Rhagfyr Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
A cold Christmas, but what about New Year?

Last week, most parts of the country saw particularly varied weather, even by the UK's changeable standards! Cloudy and damp spells brought in by mild westerly winds were regularly interrupted by incursions of colder, clearer air from the northwest. As result, overnight temperatures varied from values more akin to November daytime maxima through to the more seasonal sub zero temperatures that brought some icy patches on other nights. Northern parts of the UK experienced a decent stream of snow showers at times, but all areas saw plenty of mild weather too.

As we head through Christmas week and into the New Year, we look set to continue this varied theme mild and colder spells. Read on to find some of the details...

Llun 22 Rhagfyr—Sul 28 Rhagfyr
A Christmas chill to feed in from the north?

The festive week gets underway with a familiar scenario. A weather front will lie across Scotland and Northern Ireland, marking the boundary between colder air to its north, and milder air to its south.

In the colder regime, skies will tend to be clearer with spells of crisp sunshine by day, lighter winds and overnight frosts, but there will be the risk of some wintry showers, that will bring some snow to the hills of northern Scotland in particular.

Along the front and to its south, we can expect much cloudier conditions and some prolonged outbreaks of rain, particularly for western facing hills, with eastern areas staying largely dry. The strength of the winds along the front and to its south will also be noteworthy, with particularly blustery conditions anticipated for areas to the east of The Pennines and the far southeast of Scotland early in the week.

Gradually, through Tuesday, Wednesday (Christmas Eve), and Thursday (Christmas Day), the weather front is expected sink southwards, allowing the colder, clearer conditions to reach to all parts by Christmas Day. Most places should become cold, dry and bright by Christmas Day, with just a few snow showers for north and northeast of Scotland. There is just a slight risk at the time of writing that the weather front may slow up a little as it transits southwards across southern Scotlland and Northern England. Should this happen, we could see a more prolonged spell of rain and possibly snow for these parts during Christmas Eve, but this is a low risk scenario.

Boxing day should start off clear and cold again, but as we head into the weekend, a deep area of low pressure is expected to swing in from the Atlantic, bringing some wet and very windy weather, particularly for northwestern parts, with even the risk of a transient period of snow for some more northern parts of the UK.

Llun 29 Rhagfyr—Sul 4 Ionawr
A New Year but back to square one with the weather

The low pressure system that is likely to bring some particularly unsettled weather to northwestern parts of the UK through the previous weekend is expected to clear away to the east fairly readily through the last few days of the year. So at the time of writing, there seems to be a chance that the old year could end and the New Year begin on a relatively dry, clear and potentially chilly note. That said, all the latest weather forecasting techniques and computer models suggest that any such quieter, colder interlude will once again be swiftly replaced by a milder, wetter and windier westerly regime. In effect, this mean a return to the familiar pattern of cold and mainly dry conditions, followed by mild, wet and windy conditions that we have experienced through the last several weeks.

Llun 5 Ionawr—Sul 18 Ionawr
Still no real sign of a prolonged cold spell

All the indications are that, as we move through to the end of January, the song remains the same! We continue to monitor the atmosphere and computer models, looking for any indications of a potential change to a less mobile and changeable weather set up over the UK. So far though, any sign of a prolonged cold or milder spell has yet to appear, and for the time being, it seems we will have to contend with large changes in weather conditions on an almost day to day basis! This means that milder, windy and wet spells will likely be interrupted by colder, clearer intervals. Of course, here at the BBC Weather Centre, we will continue to monitor the situation, and will keep you informed of any changes to the longer term forecast.

Wythnos nesaf

Statistically, January brings on average the most number of snow days during a given calender year. So can we expect much snow during January? 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 29 Rhagfyr

Crynodeb

Sadwrn 27 Rhagfyr Cyhoeddwyd am 14:38

Crynodeb

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

Cold and bright, with some wintry showers.
This Evening and Tonight

Wintry showers continuing in some coastal areas, gradually easing overnight. With clear skies a widespread frost is expected, locally severe over lying snow in Scotland. Patchy low cloud and fog may form across England and Wales. Breezy in far southeast.

Sunday

A frosty start with the risk of some icy stretches, then a largely dry, bright but cold day. A few wintry showers are possible near some east coasts.

Outlook for Monday to Wednesday

Largely dry, bright and cold with widespread overnight frosts and some freezing fog patches. Cloudier and windier in the far northwest, with some rain. Windy with rain in west Wednesday.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 23:02, Sadwrn 27 Rha Mae’r fideo yma ar gael yn Saesneg yn unig.