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Rhybuddion

Gwener 20 Ionawr Cyhoeddwyd am 00:09

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Friday 20 January

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 20 January

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 16 Ionawr Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
A quieter end to the month

Last week we saw a real taste of winter with strong, biting northerly winds, spells of rain, sleet and snow, and icy stretches. Next week the weather will be much quieter and calmer by comparison but it will still be cold for some.

Llun 16 Ionawr—Sul 22 Ionawr
High pressure in charge

There will be a lot of dry weather around as an anticyclonic pattern takes hold this week. The devil will be in the detail though, because high pressure doesn't always bring lots of sunshine. There will be some, especially across the east and south-east of the UK, but for many it will be a cloudy week with light winds. It's across the south-east of England that we'll hold onto some colder air too, giving a risk of frost and fog. The exception to the rule will be across the north-west of the UK, where winds will be stronger, there will be some rain at times and it will be milder.

Llun 23 Ionawr—Sul 29 Ionawr
How long will it last?

Established areas of high pressure often need quite a shove to move them along and it looks as though the quiet spell of weather should last into the start of next week. However, as the days progress, a spell of rain and stronger winds may move in from the north-west and slowly continue south-eastwards across the UK. This would bring temperatures closer to normal - high single figures. However, there is some uncertainty about the timing and transition to something more unsettled.

Llun 30 Ionawr—Sul 12 Chwefror
It's February already?

As we head towards the start of a new month the most likely scenario is for a more mobile pattern of weather to affect the UK. This would mean areas of low pressure and weather fronts making their way in from the west, with some drier days thrown in for good measure. Temperatures should stay near normal but during drier spells it may well turn colder with some frosty and foggy nights.

Wythnos nesaf

Will we see another cold, wintry spell of weather again?

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 23 Ionawr

Crynodeb

Gwener 20 Ionawr Cyhoeddwyd am 01:40

Crynodeb

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

Sunny and cold for most, but cloud lingering in places.
Today

It will be a frosty start across Wales and central and southern England, with a cold and sunny day in store. Some sunshine for northern Scotland.

Tonight

Cold and frosty across the UK, with clearing skies across northern England and Northern Ireland. A few fog patches likely. Cloudier across Scotland, with some parts staying frost-free.

Saturday

Mostly settled with variable cloud and some bright spells but staying dry for most. A few drizzly showers are likely across central parts though, possibly turning wintry on high ground.

Outlook for Sunday to Tuesday

Mostly settled. Some light showers on Sunday. Cold and frosty overnight, fog likely in the south on Monday and Tuesday, perhaps slow to clear. Unsettled in the north-west later Tuesday.

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