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Rhybuddion

Iau 5 Mawrth Cyhoeddwyd am 00:11

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

EARLY YELLOW WARNING OF RAIN for Scotland.

Updated 0000 on Thu 05 March 2015

Valid from 1200 Fri 06 March to1200 on Sun 08 March.

Rain will be persistent and heavy at times through much of Friday and Saturday and lasting into Sunday morning. The public should be aware of the risk of localised flooding and some travel disruption, especially on Saturday and on Sunday morning.

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 5 March

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 2 Mawrth Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Is winter coming or going?

March signals the start of the meteorological spring which we tend to associate with very changeable conditions; early morning frosts, occasional showers and a gradual increase in temperature. The winter months are December-February and whilst provisional statistics suggest it's very likely that the UK has seen its sunniest winter since records began in 1929, figures for temperature and rainfall have been fairly average.

Early figures for February show a drier and cooler than average month thanks to high pressure and settled conditions at the start.This trend for cooler than average conditions looks set to continue into March with strong winds, chilly temperatures, overnight frosts and heavy wintry showers. As we move towards the middle of the month, high pressure seeks to establish itself bringing more settled weather and a gradual increase in daytime temperatures.

Llun 2 Mawrth—Sul 8 Mawrth
A wintry feel to the start of spring

Monday will be characterised by strong winds and gales across the UK bringing a mix of sunshine and showers. The best of the sunshine will be found in southern and eastern areas with heavy, thundery showers to the north and west. These showers are likely to bring hail and snow at times, particularly over higher ground but even to low levels for a time. Mid-single figure temperatures will feel much colder in the wind. Tuesday brings a slight easing of the wind but with further heavy, thundery and wintry showers for the north and west. A ridge of high pressure will build in through the middle part of the week to settle things down with fewer showers and much lighter winds but this will allow a widespread sharp frost for Thursday morning. Through the end of the week a band of rain will slip south-eastwards across the UK before an area of high pressure starts to push in from the south bringing drier and less windy conditions.

Llun 9 Mawrth—Sul 15 Mawrth
Starting to feel a bit more spring-like

As high pressure continues to build from the south, much of the UK will see dry and settled weather with temperatures near or slightly above average by day but with temperatures falling away quickly overnight with widespread frost. It is likely that the settled weather will bring periods of sunny weather but there will also be cloudier interludes. Across northwestern areas it looks likely that there will be occasional outbreaks of rain as weather systems from the Atlantic sneak around the top of the ridge of high pressure.

Llun 16 Mawrth—Sul 29 Mawrth
Staying settled for most but still chilly by night

In the second half of March it looks probable that the UKs weather will be dominated by high pressure at first, but that this will weaken and become more localised to the south of the by the end of the month. Under the high pressure, conditions will remain dry and settled with mild temperatures by day and cold, possibly frosty nights. Further north, sporadic rain and showers will continue to edge around the high pressure but any extended wet and windy period looks unlikely.

Wythnos nesaf

Will April bring the customary showers?

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 9 Mawrth

Crynodeb

Mercher 4 Mawrth Cyhoeddwyd am 15:37

Crynodeb

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

Cold overnight. Dry in the south, rain in the northwest.
This Evening and Tonight

Staying cold, dry and clear in the south and east, leading to a widespread frost developing. Turning cloudy, milder with occasional outbreaks of rain and strengthening winds in the northwest with local gales likely in exposure.

Thursday

Rain in northwestern areas turning heavy and persistent over hills. Further south, brighter, drier conditions will prevail, although probably becoming cloudier later. Windy in north with local gales. Turning milder.

Outlook for Friday to Sunday

Rain affecting northwest Scotland, often heavy and persistent. Elsewhere, variable cloud with sunny spells. Windy with gales in the northwest. Rain edging south Sunday. Mild or very mild for most.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 23:34, Mercher 4 Maw Mae’r fideo yma ar gael yn Saesneg yn unig.