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Rhybuddion

Llun 22 Medi Cyhoeddwyd am 00:12

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Monday 22 September

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 22 September

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 Medi Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
The driest start to September for 50 years

The first half of September has been unusually dry and mild across large swathes of the UK with provisional Met Office statistics suggesting temperatures have been well above average and rainfall amounts have been much below the seasonal norm. Figures up to 15th September show there has been a measly 6.7mm of rain across the UK; this is only 7% of the average 96mm. The question is though - will it continue? Read on to find out more...

Llun 22 Medi—Sul 28 Medi
The end to high pressure is in sight

This week finally sees the end of high pressure dominating the forecast, though, for the start of the coming week at least it is still providing us with some glorious sunshine. As we look through the forecast for this week the weather turns progressively more unsettled with areas of low pressure bringing spells of rain towards the UK from the Atlantic. This gradually sets up a northwest -southeast split; the best of the weather for England and Wales whilst Scotland and Northern Ireland should expect spells of rain and stronger winds.

Llun 29 Medi—Sul 5 Hydref
No change in the weather patterns

In similarity to the rest of September it looks like the weather setup is not going to change significantly as we look ahead in the period. The northwest - southeast split is set to continue with the lion's share of the sunshine and driest conditions expected for southern England and Wales. For Northern England, Scotland and Northern Ireland spells of wind and rain could mean that October gets off to a much wetter start than September did!

Llun 6 Hydref—Sul 19 Hydref
Looking futher ahead

The split in conditions over the country is more likely than not to continue as we head into mid-October as well. In this situation day time temperatures are likely to be around average for the most part, however, in any sunnier spells especially in the south and east it should feel pleasantly warm. However, as is typical with October nights it will be feeling chilly overnight with some mist and fog patches.

Wythnos nesaf

Will September continue to be dry - find out more next week.

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 29 Medi

Crynodeb

Llun 22 Medi Cyhoeddwyd am 04:42

Crynodeb

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

Dry and fine for most, but rain in far northwest.
Today

A cold start this morning, with a few localised mist and fog patches, then dry and fine for most once again. However rain will edge across northwest Scotland, then into Northern Ireland and the rest of Scotland into the evening.

Tonight

The cloud and rain will continue to push southeastwards overnight, possibly just about reaching northern parts of northern England by dawn. Elsewhere, dry, clear and cold once again.

Tuesday

The band of cloud and occasional rain will continue southwards, across the rest of northern England and north Wales by evening. Largely dry and fine either side.

Outlook for Wednesday to Friday

Cloud and rain clearing southwards on Wednesday with the odd shower following. Largely cloudy on Thursday and Friday with outbreaks of rain or drizzle for many. Breezy throughout, especially Thursday.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 12:45, Llun 22 Med Mae’r fideo yma ar gael yn Saesneg yn unig.