Y Tywydd Y Deyrnas Unedig


Y Deyrnas Unedig


Mercher 25 Tachwedd Cyhoeddwyd am 10:46

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

YELLOW EARLY WARNING OF HEAVY RAIN for West Highlands of Scotland.

Updated 25 November at 10:30

Valid from 00:05 to 15:00 on Friday 27 November

Following some wet weather on Thursday afternoon, rain will turn heavier on Thursday night and Friday morning, before turning showery during the afternoon. Be aware of the risk of some low level disruption due to localised flooding of roads.

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 25 November

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 23 Tachwedd Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Atlantic winds set to dominate

November's exceptional mild spell came to an abrupt end over the weekend. A northerly blast brought snow to some places on Saturday, and many parts of the country finally saw a couple of frosty nights. Early morning temperatures as low as minus 6 Celsius were quite a shock after so many days of 15 degrees or more. Temperatures will head back up to normal as winds from the west return, and the coming month is set to see winds predominantly from a westerly quarter.

Llun 23 Tachwedd—Sul 29 Tachwedd
Windy and unsettled but also some sunshine

The weekend's cold, bright weather hangs on over England and Wales on Monday, once freezing fog patches clear away, before rain and higher temperatures over Scotland and Northern Ireland spread southeastwards later. After early rain in the southeast, Tuesday and Wednesday will see quite strong or even gale force northwesterly winds across the whole country. There'll be some sunshine but showers will run into many western and northern parts, these becoming persistent for a time. With temperatures near normal, it will feel chilly in the wind, and the showers will be of snow on Scottish hills. It becomes less windy and milder during Thursday but also more cloudy, with some rain in the west. Friday and Saturday will then see further quick changes in the weather, as a spell of rain is carried eastwards across all parts followed by strong and colder westerly winds with showers - these wintry in Scotland.

Llun 30 Tachwedd—Sul 6 Rhagfyr
Wind, rain, sun. High risk of gales.

December looks set to start with a period of very unsettled and often windy weather. In fact, there's a high chance of gales or severe gales during this week. The strong winds will occasionally push bands of rain across the country, the rain heaviest in the north and west. In between the rain bands, colder west or northwesterly winds will bring brighter days with blustery showers. The north will feel the impact of these colder interludes most, with showers falling as snow to quite low levels at times. On the other hand, southern areas will see the mild intervals last longer, and with all the wind there'll be very little in the way of overnight frost or fog anywhere.

Llun 7 Rhagfyr—Sul 20 Rhagfyr
In the zone

The pattern of frequent, and strong, westerly winds that have characterised this very unsettled November is known as 'zonal flow'. At present, indications from the computer models are that the middle fortnight of December will continue with this weather pattern. So expect a continuation of unsettled weather with active low pressure systems bringing bouts of wet and potentially very windy weather, but with colder showery interludes. Overall, temperatures will probably range from a bit below normal in the north to a little above normal in the south. Frost is likely to be infrequent, but northern hills will often see snow in the showery periods.

Wythnos nesaf

Will the shortest, darkest days of December also be wet and windy?

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 30 Tachwedd


Mercher 25 Tachwedd Cyhoeddwyd am 15:36


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

Cloudy with patchy rain in west, drier in the east.
This Evening and Tonight

Mostly cloudy and fairly mild in the west this evening and overnight with some outbreaks of rain at times. Drier in the east with some clear spells and becoming chilly in places. Breezy in the north, but light winds elsewhere.


Mostly dry and bright in the east. Cloudier elsewhere with rain at times, especially in western Scotland. Breezy, with a risk of gales in the north. Damp and windy overnight.

Outlook for Friday to Sunday

Windy with heavy rain moving eastwards on Friday, then colder with gales and blustery showers on Saturday. Windy with further rain in places on Sunday, heavy in the north.

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Fideo Rhagolwg: DU

Rhagolwg: DU Diweddarwyd 12:42, Mercher 25 Tach Mae’r fideo yma ar gael yn Saesneg yn unig.