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Rhybuddion

Mawrth 26 Gorffennaf Cyhoeddwyd am 00:00

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Tuesday 26 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.

Tuesday 26 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 25 Gorffennaf Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
No quick return to hot weather - some showers

Almost everywhere had a hot day last Tuesday, and eastern England has had a very warm week. Temperatures will be lower during the coming week, but the pattern of showery weather often affecting the north and west but only occasionally pushing into southeastern parts is expected to continue into early August. There's no immediate sign of a return to hot weather, but the southeast will see some warm days, and there's just the chance that more settled weather will develop everywhere for a time.

Llun 25 Gorffennaf—Sul 31 Gorffennaf
Showers on most days. Not so warm in the east.

For many parts of England, Monday will be the coolest day for some time, with temperatures back near the normal for late July. There'll be some sunshine and only isolated light showers over England and Wales, while Northern Ireland and Scotland have a cool westerly wind and more widespread showers, with this cool showery weather continuing there on Tuesday. Further south it will turn cloudier with some patchy rain over Wales and the southwest. On Wednesday and Thursday, rather cloudy weather will spread across the country, bringing rain especially to western parts. The southeast will be drier, and may turn warmer and brighter but with the chance of a few heavy showers. For Friday and the weekend the mix of sunny intervals and scattered showers will continue. Northern areas will be rather cool, and will see more showers, while the south is drier and a little warmer. As a result, some places in the south will end up with a very dry July overall.

Llun 1 Awst—Sul 7 Awst
Change of month... but no change in weather

August begins with the same sort of weather pattern expected to continue. So we continue to look to the west for occasional bands of rain moving in from the Atlantic. These will be more potent in the northwest, so expect some heavy bursts of rain there, while in the south and east any rain will be lighter and more patchy in nature. Scotland and Northern Ireland will have temperatures near or a little below normal, while the south may see one or two warmer, more humid days.

Llun 8 Awst—Sul 21 Awst
Increasing chance of a fine, warm spell

The pattern of rather unsettled weather, giving most of the rain in the northwest and best of the temperatures and sunshine in the southeast, is likely to prevail through the middle fortnight of August too. However, some computer models are suggesting that a high pressure area may develop across the British Isles. This means there is an increasing chance that there will be a spell when the whole country can expect several days of fine, warm weather with long sunny spells. This can only be considered a moderate probability at this range - the high pressure may prove reluctant to shift from its usual position near the Azores.

Wythnos nesaf

Watching for signs of the Azores High shifting towards the British Isles

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 1 Awst

Crynodeb

Mawrth 26 Gorffennaf Cyhoeddwyd am 13:34

Crynodeb

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

Rain moving southeast to affect many parts.
This Evening and Tonight

Rain or showers across many western and northern parts will move southeast, with clearer conditions following to northern areas. Some of the rain will be heavy, particularly across western parts, and accompanied by hill fog.

Wednesday

Rain gradually easing in the south with skies brightening, but isolated heavy and thundery showers are possible in the afternoon. Rain will affect northwest Scotland. Dry with sunny spells elsewhere.

Outlook for Thursday to Saturday

Showery rain, perhaps heavy and thundery, affecting most away from northern Scotland on Thursday. Sunny spells and showers on Friday and Saturday, most frequent in the north. Generally feeling fresh.

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Diweddarwyd 17:06 BST, Dydd Mawrth 26 GorMae’r fideo yma ar gael yn Saesneg yn unig.