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Rhybuddion

Gwener 22 Awst Cyhoeddwyd am 00:20

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Friday 22 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.

Friday 22 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 18 Awst Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Where has summer gone?

It's gone south, pushed away from our shores by a strong and cool northerly wind. That wind has dropped the temperatures and brought quite a lot of showers with it, some heavy and thundery. Looks like there's more of the same over the next week but it won't be raining all day everywhere and as the winds ease and given there will be some sunshine, it should still feel pleasant enough especially so in the south.

Llun 18 Awst—Sul 24 Awst
Generally unsettled and cooler than average

Temperatures and the general feel of the weather will be a talking point early in the week because it will be windy and cool with plenty of showers but also some drier, brighter spells. The brisk winds will gradually ease as the low pressure centre that's driving our weather eases away towards Scandinavia.

The distribution of the showers will change daily, eastern England will be a focal point on Monday and Wednesday, probably that bit drier on Tuesday.

By Thursday, some uncertainty creeps into the forecast as an area of more general rain spreads down from the north with showers following. The southeast will probably stay dry whilst on Friday it looks like showers could develop widely across the UK. Rainfall amounts are likely to be around average for most but in the north and east of the UK it will probably be quite wet.

Temperatures will be below or even well below normal especially in the north, accentuated by the winds early in the period. Nights will be relatively chilly with some rural spots dipping well into single figures.

As the bulk of the rain this week will be from showers there should be some sunshine around too, some western parts doing quite well with at least average amounts of sunshine.

The Bank Holiday weekend may well start on a mostly dry note but cloud and rain is gathering out west.

Llun 25 Awst—Sul 31 Awst
A change in the winds...

Not a change to a warm southerly and a return to summer but more of a westerly weather pattern is likely to develop. That will bring low pressure systems and their associated fronts from the Atlantic.

So, for the last week of the summer holidays the unsettled theme continues but at least we should see temperatures recovering to something closer to the norm for the time of year.

With Atlantic lows crossing the UK there's likely to be a lot of cloud and rain this week. Consequently, we aren't going to see a great deal of sunshine, and the rain could be quite heavy with above or well above average amounts expected. The south east probably seeing a bit less rain than elsewhere but confidence on this aspect is relatively low.

Llun 1 Medi—Sul 14 Medi
Pressure risng in the south?

Back to school and we keep the west or northwesterly winds so most of the rain this week will be in the north and west of the UK.

Nowhere is likely to see above normal rainfall amounts but it should be drier in the south and east. Pressure may well rise in the south, helping to keep things mostly dry with some sunshine at times. However, with the northwesterly winds we'll be dragging in some cooler air so temperatures will be a bit on the low side both by day and night.

The details at this range are difficult but we are fairly confident that the west or northwest winds will be with us.

Wythnos nesaf

September is a transitional month - which way will the last two weeks go?Could we see a return to something more summery?

Rhagolygu Misol
Mae'r tywydd y tu hwnt i'r wythnos i ddod yn herio hyd yn oed yr arbenigwr tywydd mwyaf profiadol. Mae modelau rhagolwg rhifiadol y tywydd o'r 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 creu darlun o'r tebygoliaeth o'r gwahanol fathau o dywydd fydd yn effeithio'r DU.

Diweddariad nesaf am 10:00, Llun 25 Awst

Crynodeb

Gwener 22 Awst Cyhoeddwyd am 03:38

Crynodeb

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

Sunshine and scattered showers, most frequent in the northeast.
Today

Early rain should clear the far southeast during the morning, with sunny spells ands showers following for all parts. Showers will be most frequent in the cloudier north and east, where they could be heavy at times.

Tonight

Isolated showers will continue in places, however most will have a dry and increasingly clear night. With the wind gradually easing, this will lead to it feeling rather chilly.

Saturday

A generally fine and dry day, with sunny periods. However showers will continue to affect some northern and eastern areas, where they could be heavy at first, before easing later.

Outlook for Sunday to Tuesday

A cold start Sunday, but mostly fine and dry with some sunshine. Rain then spreads eastwards Monday, although much of Scotland staying drier and brighter. Further showers are likely Tuesday.

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