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Rhybuddion

Llun 25 Gorffennaf Cyhoeddwyd am 00:22

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Monday 25 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 25 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 18 Gorffennaf Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Some midsummer heat for a time - fresher later on

We're half way through summer now, and so far for most places, the summer has been fairly underwhelming, with temperatures around average, limited amounts of sunshine, and quite a bit of rain.

However, as we head towards the end of the month, things are starting to feel much more summer-like with a dose of hot, humid weather across much of the country. It does look as through we'll see a return to fresher, more changeable weather before too long, but still there are some hints of further spells of warm and bright weather at times as we look towards late summer.

Llun 18 Gorffennaf—Sul 24 Gorffennaf
Heat and humidity kick things off

Most parts of the country start the week under the influence of high pressure, drawing in hot and humid conditions from the near continent. We're likely to see temperatures above 30 degrees for many places, making this the warmest spell of the summer so far. So plenty of dry, sunny weather at first, away from northwestern parts of the country that is, where low pressure will brings spells of rain at times. During the middle of the week, it looks like we'll see a breakdown in the heat and humidity, with the arrival of heavy showers and thunderstorms moving west to east across the country. The showery and thundery spell will give way to fresher conditions from the west, and a return to sunshine and scattered showers to end the week.

Llun 25 Gorffennaf—Sul 31 Gorffennaf
Driest in the south, unsettled further north

This week we're likely to have high pressure holding on across southern parts of the country, with lower pressure often situated to the north. Fronts moving in from the Atlantic will bring showers or longer spells of rain at times, interspersed with drier, brighter interludes. The warmest and sunniest weather looks likely to be across southern Britain and Northern Ireland, with cooler and wetter conditions generally towards the northeast.

Llun 1 Awst—Sul 14 Awst
A mix of weather types ahead

After the warm, humid spell in July, it looks like a return to business as usual for the start of August. The first few weeks of August are likely to remain changeable as weather systems cross the UK, bringing wind and rain at times. Also, some drier and warmer interludes will bring more summery spells of weather too. The warmest and sunniest conditions are most likely towards southern England and Northern Ireland, with cloudier skies often across the northeast.

Wythnos nesaf

As we look towards late summer, will there be any signs of an extended spell of warm, sunny weather? Or should be be packing away the paddling pools for another year? Watch this space...

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 25 Gorffennaf

Crynodeb

Sul 24 Gorffennaf Cyhoeddwyd am 13:37

Crynodeb

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

Showers developing for most on Monday, drier in the southeast.
This Evening and Tonight

Rain across Scotland and northern England will gradually become confined to the far north of Scotland overnight. Elsewhere remaining dry, though one or two showers developing across Northern Ireland and western Scotland later in the night.

Monday

Bright or sunny with scattered showers for many on Monday, these heaviest over Scotland and Northern Ireland. Parts of Wales and southern England staying dry for much of the day.

Outlook for Tuesday to Thursday

Outbreaks of rain in the north and west on Tuesday, with isolated showers elsewhere. Breezy, with rain on Wednesday. Further rain on Thursday, though sunshine and showers in southeast England.

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