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Rhybuddion

Mercher 24 Awst Cyhoeddwyd am 07:56

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Wednesday 24 August

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.

Wednesday 24 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 22 Awst Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
A last spell of summer heat for some parts?

Last week brought a wide variety of weather for the UK. The week began on very quiet note, with high pressure bringing chilly starts and then long sunny days of warm sunshine. As the week progressed though, an unseasonably deep area of low pressure moved in from the Atlantic to bring very wet and windy conditions across many parts of the UK, along with a distinctly cooler feel. Gales affected many parts of England and Wales through Saturday.

After a drier and less windy Sunday, this coming week offers a reversal of the last. Early in the week, We can expect a further rain-bearing system to bring some rather wet weather for many places, but as the week progresses, warm air is expected to drift in from the near continent to affect southern and central parts of the UK, along with a few thundery showers, giving a summery feel. Further north and west though, the remnants of Atlantic weather systems will likely bring a fresher feel with the threat of showers.

Beyond next week, and into the last days of the meteorological summer, it looks like the warm conditions across southern and central areas will be shunted back into the continent by westerly winds that will bring Atlantic weather systems towards our shores. The most unsettled conditions will likely be across northwestern areas, but some more prolonged dry weather may well still be in store for southern regions into the last days of summer. Read on to find out the details...

Llun 22 Awst—Sul 28 Awst
Hot and humid in the south, fresher in the north.

Monday will get off to a damp start for much of the UK, with a particularly humid feel across southern parts of England and Wales. Through the day though, skies will brighten for Northern Ireland and also eastern parts of England and Scotland. Wales, western Scotland and western districts of England will likely stay rather cloudy and muggy though, with some further albeit patchy rain at times.

Overnight into Tuesday, warm air will start to drift in from the near continent across the southern half of the UK. Through Tuesday daytime, this warm air will prevent an Atlantic front from making any further significant progress east, as it brings rain to Northern Ireland, northern England, southern Scotland and some of the western fringes of Wales and southwest England. By contrast, parts of southeast England and the Midlands will experience some fine and warm conditions.

A similar theme will prevail on Thursday with a good deal of fine, dry but hot and humid conditions across the southeastern half of the UK, but a stalled Atlantic weather front may bring some outbreaks of rain to areas further to the northwest.

Thursday will most likely bring the onset of some thundery showers across the southern quadrant of the UK to bring a rather hot and humid feel. To the north and west, further cooler and damper conditions are expected, again in association with a waving Atlantic front that will be stalled from moving further east by the feed of warm air pushing up from France across the eastern side of the UK. Through Friday and into the weekend, at this stage it looks like an Atlantic low will gradually bring fresher and showery conditions to northwestern parts, with less warm and generally bright weather in store for south England and Wales as the hot and humid continental air recedes away to the east.

Llun 29 Awst—Sul 4 Medi
Summer making an early exit from the northwest.

As we head into the last few days of the meteorological summer, the most likely synoptic set up is that the jet stream will be suitably positioned high in the skies across the mid-Atlantic to push a low pressure system towards the northwestern half of the UK. As a result, it is likely that Scotland, Northern Ireland and northern England will experience a breezy end to the summer with outbreaks of rain at times, with temperatures around perhaps a little below where we'd normally expect them to be in late August.

Further to the south, although some showery and breezy spells can be expected at times, it is likely that the weather across Wales and the southern half of England will often be fine and dry, with some warm days at times.

Similar conditions are forecast for the first few days of the meteorological autumn.

Llun 5 Medi—Sul 18 Medi
Fairly typical early autumn weather.

As we move into the first full week of the meteorological autumn, all the forecasting tools and techniques at our disposal point towards a fairly unsurprising meteorological set up for the time of year. At time of writing, the most likely scenario is that the jet stream will continue to push Atlantic low pressure systems towards the UK at times throughout this period, with the wettest and windiest conditions most frequent in the northwest, and the rest of any drier, brighter and warmer interludes reserved for southern parts of the UK.

Wythnos nesaf

Next week's issue will take us into the latter part of September. Will there be a sign of any potent autumnal Atlantic weather systems heading our way? As always, we'll be keeping a close eye on any developments in the forecast here at the BBC Weather Centre.

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 29 Awst

Crynodeb

Mercher 24 Awst Cyhoeddwyd am 01:37

Crynodeb

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

Mostly dry with sunny spells. Hot in the southeast.
Today

Predominately dry with a fair amount of sunshine. Feeling pleasantly warm for most, with another hot day in prospect for East Anglia and southeast England. Turning cloudier with some showery rain in the south later.

Tonight

Rather cloudy across England and Wales with outbreaks of showery rain, perhaps heavy and thundery. Very warm and muggy in the southeast. Mostly dry with clear spells in the northwest.

Thursday

Cloudy with showery outbreaks of rain across England and Wales, perhaps heavy and thundery. Very warm in the far southeast. Brighter and fresher with scattered showers in the northwest.

Outlook for Friday to Sunday

Mainly fine on Friday, with scattered showers in the northwest. Heavy, thundery downpours moving north on Saturday, becoming warmer. Persistent rain across the north Sunday, fresher with heavy showers elsewhere.

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