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Rhybuddion

Llun 27 Gorffennaf Cyhoeddwyd am 21:12

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Monday 27 July

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.

Monday 27th July

There are no flood warnings in force anywhere in the UK.

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 27 Gorffennaf Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Wandering jet stream means changeable weather

As the last few schools closed their doors for the summer, the jet stream decided to head south for its holidays too. This fast-moving river of air high in the atmosphere is the driving force behind our weather. When it's to the north of the UK (a normal summer position) we get warm, settled conditions but when it dives south then the rain and gales are steered our way and temperatures fall. That's how the summer holidays started for many of us, with some unseasonably wet and windy weather. The outlook suggests the jet stream will continue its meanderings well into August so we can expect further unsettled spells, although there are hints of something a little quieter for the middle of the month.

Llun 27 Gorffennaf—Sul 2 Awst
Windy start, sunnier finish.

Low pressure dominates the weather right across the UK at the start of the week bringing largely cloudy skies and outbreaks of rain, this heavy and persistent for a time across northern areas. Unusually strong winds around the depression bring the threat of gales to some parts of Wales and southern England.

Winds swing round to the north as the low moves away, bringing in colder air which leads to some particularly chilly nights as winds fall light and skies clear during the middle of the week, although it feels warmer by day as sunshine amounts increase.

A weaker weather system brings an increasing chance of showery outbreaks of rain to northwestern areas later in the week, although warmer air should start to spread in as winds swing round to the southwest ahead of another developing area of low pressure.

Llun 3 Awst—Sul 9 Awst
Unsettled weather returns

The jet stream is likely to start steering some more low pressure systems our way during the week, bringing a spell of unsettled weather. Northwestern areas will be most prone to outbreaks of rain and unusually strong winds. Wet and breezy weather is likely to push further south at times, but there is a good chance that much of England and Wales will experience some warm and dry weather, especially during the early part of the week.

Llun 10 Awst—Sul 30 Awst
A summer break?

There are some signs that the weather could turn more friendly during the second part of August, but it's not a particularly strong signal so there is a large degree of uncertainty and certainly potential for occasional brief unsettled spells. Equally, any hotter weather is unlikely to last for more than a day or two. Overall, it's looking possible that this August could follow the example of last August in coming out cooler than average overall.

Wythnos nesaf

Time's running out for summer as we head on through August - will there be a comeback?

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 Awst

Crynodeb

Mawrth 28 Gorffennaf Cyhoeddwyd am 02:40

Crynodeb

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

Staying unsettled and cool.
Today

Showers or longer spells of rain across Scotland, Northern Ireland and Northern England, locally heavy and thundery in places. Sunny spells and scattered showers elsewhere but largely dry across the south. Temperatures below average but feeling pleasant in the sunshine.

Tonight

Rather cloudy with showery rain across Northern Ireland, Northern England and Wales, locally heavy and possibly thundery. Dry with clear spells and breezy in the south. Cooler in the north.

Wednesday

Dry and bright with sunny spells for many. There are likely to be some showers, possibly heavy at times, mainly in north and east. Breezy around western coasts, easing later.

Outlook for Thursday to Saturday

Dry for much of the UK on Thursday with lighter winds. Some chilly nights in places. Turning showery and breezy in the northwest on Friday, extending southwards a little Saturday.

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Fideo Rhagolwg: DU

Rhagolwg: DU Diweddarwyd 12:34, Mawrth 28 Gor Mae’r fideo yma ar gael yn Saesneg yn unig.