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Rhybuddion

Gwener 31 Gorffennaf Cyhoeddwyd am 00:30

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Friday 31 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.

Friday 31 July

There are no flood warnings in force anywhere in the United Kingdom.

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

Iau 30 Gorffennaf Cyhoeddwyd am 13:34

Crynodeb

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

Wet and windy in the northwest. Fine and dry elsewhere.
This Evening and Tonight

Cloudy and windy conditions will spread across Scotland and Northern Ireland, accompanied by outbreaks of rain. Dry and largely clear across much of England and Wales, although some showers likely in the north later. Chilly, especially in the south.

Friday

Cloudy and windy in the northwest for much of the day, with outbreaks of rain, although turning brighter by the evening. Fine, dry and warmer than today in the southeast.

Outlook for Saturday to Monday

Sunshine and showers on Saturday, heavy in Scotland with hail and thunder. Mostly fine on Sunday, but rain in the northwest later, then showery on Monday. Becoming warmer.

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Fideo Rhagolwg: DU

Rhagolwg: DU Diweddarwyd 22:32, Iau 30 Gor Mae’r fideo yma ar gael yn Saesneg yn unig.