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Rhybuddion

Mercher 22 Hydref Cyhoeddwyd am 00:32

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Wednesday 22 October

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.

Wednesday 22nd October 2014

There are flood warnings in force across the following locations:

ANGLIAN (2)

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 20 Hydref Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Gonzalo heads for the UK

Ex-Hurricane Gonzalo has been the strongest Atlantic Hurricane since 2010 when it peaked at a Category 4 storm. Since his formation he has battered Antigua, Bermuda and Newfoundland before making extra-tropical transition and beginning his journey across the Atlantic. Gonzalo's remnants will lose a lot of their energy as they cross the relatively cool waters of the Atlantic, and, as they reach the shores of the UK, extreme conditions seem unlikely. Rather, there will be brief spells of wet and windy weather during the start of the week - all fairly typical for this time of year.

Llun 20 Hydref—Sul 26 Hydref
Unsettled throughout and turning increasingly cool

A strong westerly flow from the Atlantic is expected this week with high pressure to the south of the UK and low pressure to the north. This set up will bring bouts of wet and windy weather to the UK equally mixed with some brighter, more showery conditions.
Monday starts with a quiet, cloudy day and occasional light showers. However, with the remnants of Hurricane Gonzalo fast approaching, wet and very windy weather is set to push in overnight. The heavy rain associated with this system will clear overnight although the strong winds will persist into Tuesday. Tuesday itself looks windy and showery with some brighter interludes, feeling cooler too which could mean the odd snow flurry over the higher ground of northwest Scotland.
The unsettled weather continues for the end of the week too, with winds easing slightly, spells of rain for all and feeling cooler with temperatures returning to the seasonal norm.

Llun 27 Hydref—Sul 2 Tachwedd
Textbook autumn continuing

From next weekend onwards the signs point to high pressure starting to build from the southwest, extending north over England and Wales. This will create a north-south split in the UK weather with the driest and brightest conditions towards the south and breezier conditions with outbreaks of rain further north. In this set up, temperatures are likely to sit where they should be for this time of year.

Llun 3 Tachwedd—Sul 16 Tachwedd
North - south split continues

Conditions look set to continue the trend of a north-south split for the first half of November with wet and windy weather most likely for the north of the country and drier and brighter weather further south. This does not mean that rain will be confined solely to northern and western areas; from time to time it could affect the whole country. Southern areas are more likely to have drier interludes with some sunny spells - however, this may lead to the risk of mist or fog forming overnight. During this period daytime temperatures are likely to be around the seasonal norm.

Wythnos nesaf

As we approach the end of autumn will we soon start to feel the cold grasp of winter?

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 27 Hydref

Crynodeb

Mawrth 21 Hydref Cyhoeddwyd am 15:40

Crynodeb

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

Gales and showers slowly easing. Rain returning to the northwest.
This Evening and Tonight

Gales will steadily ease, although it will remain breezy in many areas. A few showers will linger on into the early hours, but most places will become dry. Turning chilly in sheltered spots, with a touch of grass frost.

Wednesday

A dry, bright start for many southern and eastern areas, though turning cloudier through the day. Rain and freshening winds will return to Northern Ireland, Scotland and northern England.

Outlook for Thursday to Saturday

A band of rain will push southeast across all parts, clearing southeast England early on Saturday. Generally quite windy, with a risk of gales and squally showers in the northwest.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 23:50, Mawrth 21 Hyd Mae’r fideo yma ar gael yn Saesneg yn unig.