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Rhybuddion

Llun 31 Awst Cyhoeddwyd am 00:27

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

YELLOW WARNING OF RAIN for southeast England

Updated at 11:29 on Sun 30 Aug

Valid from 01:00 on Mon 31 Aug

Valid until 17:00 on Mon 31 Aug

Further areas of heavy rain or thundery showers are likely to affect parts of southeastern England and East Anglia at times on Bank Holiday Monday. The main risk periods would seem to be before dawn and again during the middle of the day and into the afternoon. The evening should see a slow transition to drier conditions from the west.

This update slightly reduces the northwestern extent of the area at risk from thundery downpours, and brings forward the end time of the warning. Given continuing complexities, a further update to the Warning is likely to be issued early on Monday.

The public should be aware of the risk of further localised flooding and impacts on holiday activities.

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 31 August

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 24 Awst Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Will average August turn into sunny September?

It's probably fair to say that we've had a typically British mix of weather this summer, with most areas enjoying occasional spells of warm sunshine among the showers, although the balance did tip rather heavily towards the damp end of the scale across Scotland. There are signs of a change towards a more settled spell at the end of August - just as the last few schools open their doors for the new term.

Llun 24 Awst—Sul 30 Awst
Keep the brolly handy this week

The weather is dominated by the Atlantic influence this week, with areas of low pressure bringing spells of rain from the west. Some of the rain in the south could be particularly heavy, especially earlier in the week. There will be some sunshine at times too, but a brisk west to southwesterly breeze is likely to make it feel a little on the cool side.

Llun 31 Awst—Sul 6 Medi
Last Bank Holiday before Christmas

You might think a Bank Holiday Monday would guarantee rain, but in fact it looks like the last day of August will mark the start of a trend towards some more settled weather for the start of the first month of autumn. Still rather breezy with a few showers at first, but as high pressure builds in from the west the weather should become drier and quieter. It will feel pleasant enough in sunshine by day, but calm, clear nights will allow an autumnal chill to develop and perhaps some seasonal mists.

Llun 7 Medi—Sul 20 Medi
Early autumn or late summer?

It may sound surprising, but the character of our weather during the middle of September is likely to be decided by current weather conditions over west Africa. Groups of big thunderstorms, known as easterly waves, are moving out across the Atlantic from the African coast. These have the potential to develop into hurricanes, and if that happens the knock-on effect of a big injection of energy into the atmosphere is to reduce the predictability of weather across northwest Europe. In other words, there's no clear signal at the moment for the type of weather we can expect across the UK during the second part of September, The best estimate suggests that cool breezes and occasional rain are most likely in the northwest, with warmer and drier weather more common in the southeast.

Wythnos nesaf

Onwards through the autumn equinox and the nights become longer than the days, but when might those nights bring the first sharp frosts of the season?

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 31 Awst

Crynodeb

Llun 31 Awst Cyhoeddwyd am 02:41

Crynodeb

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

Rain, locally heavy, in the south. Showers further north.
Today

Cloudy with, occasionally heavy, outbreaks of rain across central, southern and eastern England with a risk of thunder in the far southeast. Brighter in Wales and the far west later. Elsewhere, will see sunny spells with scattered, locally heavy, showers.

Tonight

Cloud and rain gradually clearing eastern areas with scattered showers following, especially in the north and west. Turning windy in the east with a risk of coastal gales.

Tuesday

Rather cloudy with some sunny intervals, the best of which in the south and southwest. Scattered showers, locally heavy, for some. Feeling cool, especially in strong winds in the east.

Outlook for Wednesday to Friday

Cool northerly winds will bring sunshine and showers throughout, some heavy and locally thundery, mainly in the east. Chilly nights, especially in the west, with a touch of frost possible.

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Fideo Rhagolwg: DU

Rhagolwg: DU Diweddarwyd 07:33, Llun 31 Aws Mae’r fideo yma ar gael yn Saesneg yn unig.