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Rhybuddion

Sul 23 Tachwedd Cyhoeddwyd am 03:12

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Sunday 23rd November 2014

YELLOW WARNING of RAIN

This warning is in force for parts of southeast England.

Rain will be persistent and locally heavy through much of Sunday, with more than 20mm expected in places.

Falling on saturated ground, it is likely to cause some surface water flooding in places before clearing eastwards. The public should be aware of this hazard.

Valid on Sunday from 0300 until 2100.

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.

Saturday 22nd November 2014

There are flood warnings in force for the following region:

SCOTLAND (5)

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 17 Tachwedd Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
What does the next month look like?

The past week has been one of transition. Initially wet and windy with Atlantic low pressure systems swinging in from the west; but ending with a drier easterly theme - rather cloudy with a lot of overnight mist and fog which, being mid-November, has been stubborn to clear. So, it is with an easterly wind that we start next week - the question is though, how long will this last?

Llun 17 Tachwedd—Sul 23 Tachwedd
A much drier week ahead

We start the coming week with an area of low pressure easing away to the south of the UK bringing in an easterly wind on its northern flank allowing high pressure to gradually build in. Monday is set to see a weakening area of rain bring wet weather and cloudy skies to many; however, it will weaken throughout the day meaning that by the time Tuesday arrives it will turn drier although it will remain fairly cloudy. Wednesday sees the arrival of a weather front into the west of the UK, it never makes it very far though as it is running into high pressure. By Thursday the weather front has become stranded over western areas bringing nothing more than cloudier skies and patches of drizzly rain and that's how we end the week - rather cloudy but mostly dry.

Llun 24 Tachwedd—Sul 30 Tachwedd
Another fairly settled week

The following week at this stage is looking fairly settled with an easterly/southeasterly wind keeping conditions predominantly dry but often fairly cloudy. Later in the period it is likely that areas of rain and stronger winds will try and push into western areas bringing some wet weather here, though the progress of these weather fronts further east will be erratic and uncertain as they run in to easterly winds therefore the lion's share of the brightness and dry weather looks to be found in eastern areas of England and Scotland.

Llun 1 Rhagfyr—Sul 14 Rhagfyr
Turning more unsettled from the west

The transition to a more mobile westerly pattern with areas of low pressure pushing in from the Atlantic is always a slow and uncertain process; however, as we move into the last month of 2014 it does look like western areas of the UK will start to see increasingly wet weather. These bands of rain may at times push all the way over to the east coast of England and Scotland; however, it is here where we are likely to see the driest and brightest weather. In the quieter spells of weather, cooler spells are likely with some overnight fog and frost, at the moment though, there is no strong signal for the temperatures to dip below where they should be for this time of year.

Wythnos nesaf

Looking further ahead into December will we start to see a dip in the temperatures?

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 24 Tachwedd

Crynodeb

Sadwrn 22 Tachwedd Cyhoeddwyd am 15:37

Crynodeb

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

Persistent rain in the southeast overnight. Showers in the northwest.
This Evening and Tonight

Misty and murky across central, southern and eastern England with rain becoming heavier and more persistent. Clear and cold in Northern Ireland and parts of Scotland with patchy freezing fog and localised ice patches where showers occur in the west.

Sunday

Persistent rain and murky conditions across southeast England, becoming lighter later. Brighter and colder conditions over the northwest will gradually spread south into central parts. Showers continue across northwestern parts.

Outlook for Monday to Wednesday

Many places largely dry with sunny spells by day and frost and fog patches overnight. Cloudier across the south by Tuesday with outbreaks of rain, gradually spreading further north Wednesday.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 23:15, Sadwrn 22 Tach Mae’r fideo yma ar gael yn Saesneg yn unig.