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Rhybuddion

Gwener 23 Mehefin Cyhoeddwyd am 00:00

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Friday 23 June

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 23 June

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

Ynglŷn â Rhybuddion Tywydd y Swyddfa Dywydd

Mae’r Swyddfa Dywydd yn rhybuddio’r cyhoedd a’r rhai sy’n ymateb i argyfyngau o dywydd garw ac enbyd a allai fod yn beryglus i fywyd neu a allai gael effaith eang, drwy’r Gwasanaeth Rhybudd Tywydd Garw Cenedlaethol (NSWWS).

Mae’r Swyddfa Dywydd yn darparu rhybuddion am law, eira, gwynt, niwl a rhew. Bydd lliw yn cael ei roi i bob rhybudd, yn dibynnu ar gyfuniad o debygrwydd hyn yn digwydd a’r effaith gallai ei gael.

Am fwy o wybodaeth, darllenwch Ganllaw Rhybuddion Tywydd y Swyddfa Dywydd (dolen 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 19 Mehefin Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Scorching summer sun set to stay?

High pressure dominates the UK weather to begin with and that means that any changes we see will happen very slowly. We have an almost stationary weather front bringing persistently cloudy skies and occasional rain in the north. South of this front there are clear blue skies and high temperatures. Through the first week the high pressure will gradually break down bringing more changeable weather. Essentially if you don't like what you have now, it will change by the weekend.
Towards the end of June, high pressure looks to re-establish itself in the west with plenty of dry weather. Eastern parts will have the lion's share of any showers, not that there will be all that many. Into July things look like staying mainly dry and settled but with warm air moving in from the continent, we may have a few thunderstorms at times.

Llun 19 Mehefin—Sul 25 Mehefin
High pressure is in control

We start this week with hot and sunny weather across the south of the UK and temperatures around 30ºC for many. In the north, across Scotland and to a lesser extent Northern Ireland we have cooler air moving in along with a band of cloud and some patchy rain. This cloud and rain will pull away from the UK by Tuesday and then mid-week it will be replaced by showers from the west. We won't all see these showers though and southern parts of England and Wales may remain completely dry all week. By this point temperatures will be dipping into the low-twenties. Ending the week we'll see a weather front approaching from the northwest bringing cloud and rain to Scotland and Northern Ireland. It's slow progress as this front approaches. England and Wales will remain dry and with warm air being pulled in from the continent, temperatures here look set to climb again. As often seems to be the case, as the weekend approaches, so does the rain and most of us will see some unsettled weather by Sunday.
It's worth a mention that for much of this week, both UV and pollen levels are either high or very high.

Llun 26 Mehefin—Sul 2 Gorffennaf
A bit of variety

With high pressure receding away to the near continent, the weather will certainly be more changeable than the previous week. It looks as though we'll get a few showers spreading right across the UK but we'll get some warm and dry days too. It's going to be one of those weeks where you'll need to keep up to date with the forecast fairly often. As pressure begins to build again to the west we'll see more settled weather coming to the fore. This should gradually spread to all parts allowing temperatures to build once more. As this happens we may well get a few thunderstorms developing, particularly during the evening or overnight.

Llun 3 Gorffennaf—Sul 16 Gorffennaf
Where do you draw the line?

At this stage there is quite a lot of uncertainty in the forecast with hints of high pressure in the south and low pressure at least nearby in the north. This means that generally speaking the south will be fine and settled and the north will see some windy spells with rain at times. That's not to say the start of July will be a washout across Scotland, Northern Ireland and northern England. There will be some settled, sunny and even warm weather too. In the same vein, saying that the south will see lots of dry weather doesn't mean no rain at all. Rain in the south looks most likely to take the form of large showers and thunderstorms developing through the heat of the day.
All this talk of north and south begs another question in this forecast; where does one become the other? Unfortunately this isn't obvious and where the high pressure sits will determine this. Should the high pressure be centred across central France, we could see unsettled conditions permeating as far south as the Midlands. If it's further north, centred over England, we could see the mainly dry, warm weather pushing as far north as the central belt of Scotland.

Wythnos nesaf

Will it be the weather for beach days or board games?

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 26 Mehefin

Crynodeb

Sadwrn 24 Mehefin Cyhoeddwyd am 15:39

Crynodeb

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

Windy in the north, rather cloudy in the south.
This Evening and Tonight

Strong winds will continue in northern Scotland and there will be outbreaks of rain in the northwest. The night will be mainly fine and dry elsewhere, but further rain or drizzle will arrive in Wales and western England later on.

Sunday

Winds will gradually ease in the north and sunny spells and showers will continue. The south will be cloudier with patchy rain but it will brighten up for most later.

Outlook for Monday to Wednesday

Monday mainly sunny and dry, though rain will spread into Northern Ireland and Scotland later. Tuesday and Wednesday more unsettled with heavy rain at times and a few brighter spells.

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