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Rhybuddion

Sadwrn 25 Hydref Cyhoeddwyd am 00:13

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

YELLOW warning of rain

A slow moving frontal is expected to bring periods of heavy rainfall to northwestern parts of Scotland. Rainfall totals in excess of 100 mm are likely, with as much as 150 mm in places.

Gales or severe gales are also likely with gusts of 70 mph possible, especially in exposure. Some disruption can be expected due to surface water flooding, with large waves affecting some coastal areas, bringing the risk of over topping of flood defences.

Valid from 0010 Sunday to 2350 Monday

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 25 October

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 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

Sadwrn 25 Hydref Cyhoeddwyd am 03:36

Crynodeb

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

Windy with frequent showers northwest Scotland. Mostly fine elsewhere.
Today

Frequent showers will push across northwest Scotland, often heavy. It will be windy here too, with coastal severe gales. Variable cloud and sunny spells elsewhere, with a few showers, these mainly in the west.

Tonight

Persistent heavy rain will arrive in northwest Scotland. Generally dry elsewhere, but some patchy rain/drizzle in the west. Windy in the north, with severe gales continuing across northwest Scotland.

Sunday

The very wet and windy weather continues across the northwest. Generally windy elsewhere but much drier and brighter, particularly in the east, with some patchy drizzle in the west.

Outlook for Monday to Wednesday

Wet and windy northwest Monday, drier elsewhere. Wind and rain eases and moves south Tuesday, giving cloud and drizzle for south Britain Wednesday. Drier, chillier weather follows further north.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 07:38, Sadwrn 25 Hyd Mae’r fideo yma ar gael yn Saesneg yn unig.