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Rhybuddion

Iau 3 Medi Cyhoeddwyd am 05:27

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Thursday 3 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.

Thursday 03 September

There are flood warnings in force in the following regions;

NORTHEAST (3)

SCOTLAND (2)

Further updates will appear here.

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 31 Awst Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Autumn is officially here

Monday is the last day of the meteorological summer and whilst there were a few hot days for some, they didn't last and they certainly weren't very widespread. The word heatwave certainly didn't crop up all that much over the last three months. We've seen periods of unseasonably windy weather and wetter than average conditions, most notably so in the north and west.

Looking forward into autumn it looks like high pressure will slowly start to edge into the UK settling our weather down, but not before some wet and windy weather through the first couple of days. High pressure will bring mainly dry weather from then on with some chilly nights and settled days where cloud cover will be all important in each day's temperature. There will be showers at times and as we approach the latter half of the month, these will become more and more frequent, particularly in the north and west.

Llun 31 Awst—Sul 6 Medi
The start of meteorological autumn

Monday looks like an unsettled day with frequent showers across northern and western areas, some of which may be heavy and thundery. An area of low pressure in the south will bring more prolonged rain which again will be heavy at times and not without the risk of one or two flashes of lightning as well.

As this area of low pressure is pushed east into the North Sea by an approaching Atlantic high pressure system the UK will come under a northerly regime. Winds will be strong and cold along the east coast, perhaps reaching gale force through Tuesday and Wednesday before easing into the end of the week. Showers will become fewer and further between as the high pressure exerts its influence, bringing a mainly dry end to the week.

As always, forecasting cloud amounts under areas of high atmospheric pressure will prove tricky but under clear spells you can expect warm days and chilly nights with patchy fog. The best of the temperatures will be found in the south and west but elsewhere they are likely to be at or below average.

Llun 7 Medi—Sul 13 Medi
Calm conditions but not necessarily warm

The centre of the high pressure system over the UK will tend to drift to the northeast towards Scandinavia bringing easterly winds across the southern half of the UK to start the week, which may well lead to showers, some of which could be heavy. Apart from this the settled, mainly dry weather will continue and whilst temperatures will be generally below average, cloud amounts will have a huge impact of the feel of the day. Clear spells by day will lead to warm autumn sunshine but clear spells by night will lead to chilly, occasionally foggy nights with the risk of patchy rural frosts.

Llun 14 Medi—Sul 27 Medi
The start of astronomical autumn

Into the second half of September the area of high pressure is expected to enter a period of decline, allowing more unsettled weather to push into the UK on strengthening southwesterly winds. The most frequent showers and longer spells of rain will affect northern and western areas with a cool feel as the remnants of the high pressure provide shelter for southern and eastern areas where temperatures are likely to be above average for the time of year.

Wythnos nesaf

This may be the last chance for an Indian summer - will we get one?

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 7 Medi

Crynodeb

Iau 3 Medi Cyhoeddwyd am 01:39

Crynodeb

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

Rain for eastern parts, sunshine and showers elsewhere. Breezy.
Today

Mixture of cloud, bright spells and scattered showers, these lighter and less frequent for southern areas. A cloudier picture further north, with persistent rain affecting eastern coastal sites. Staying windy, especially in the east. Feeling rather cool for early September.

Tonight

Showery rain in eastern England, turning thundery in parts of East Anglia. Drier but rather cloudy elsewhere, with scattered showers in the far north and west. Breezy, especially in east.

Friday

Rain clearing eastern parts. Largely dry elsewhere with variable amounts of cloud. Some outbreaks of rain in Scotland. Best of the brightness in south and west. Breezy and rather cool.

Outlook for Saturday to Monday

Turning drier as high pressure builds from the west. Variable amounts of cloud with some bright spells, more sunshine likely on Monday. Feeling warm in any sunshine, but chilly overnight.

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Fideo Rhagolwg: DU

Rhagolwg: DU Diweddarwyd 07:57, Iau 3 Med Mae’r fideo yma ar gael yn Saesneg yn unig.