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Rhybuddion

Iau 28 Awst Cyhoeddwyd am 15:51

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Thursday 28th August 2014

YELLOW WARNING of RAIN for Northern Ireland.

Bands of heavy rain will move northeast across Northern Ireland this evening and into the early hours of Friday. The rain is likely to be accompanied, in places, by strong and gusty winds. Western parts of Northern Ireland appear most at risk. Much of the rain will clear eastwards later in the night.

The public should be aware of the risk of minor disruption to travel through the combination of locally heavy rain and gusty winds.

Valid from 1800 Thursday to 0500 Friday.

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 28 August

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 25 Awst Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
That was the summer that was?

With some of us waking up to a frost at the weekend and a wet Bank Holiday to follow, it seems that summer has already been and gone. Indeed the stats will almost certainly confirm that after a warm June and July, August has ended up cooler than average - the first below-par month since last November.

Looking back, it seems that the arrival of ex-Hurricane 'Bertha' earlier in the month jolted the weather pattern into this autumnal mode. Bertha's successor - Cristobal - is now spinning herself up off the coast of the USA. Maybe she will contribute to another switch in our fortunes as the month turns...

Llun 25 Awst—Sul 31 Awst
Briefly fine before the wind and rain return

Ironically the best of the weather to start the week has been in Scotland - where it wasn't a Bank Holiday! The dampness further south lingers on, but for a time through the middle of the week, a ridge of high pressure will give plenty of dry and bright weather. Pleasant too, with light winds and some sunshine, although the nights are chilly enough for a touch of frost in the glens.

After midweek, we look to the west for the next low pressure area to arrive, bringing further outbreaks of rain on a blustery wind.

By the weekend, the low will probably end up virtually on top of us. So although there will be some glimpses of late-summer sunshine, showers will never be too far away. Certainly no sign of much warmth to end the month.

Llun 1 Medi—Sul 7 Medi
'Cristobal' may be crucial

The low pressure may linger across the east, giving a few more showery days here. Meanwhile we forecasters will be looking closely at the western Atlantic and the behaviour of the remnants of 'Cristobal'. By this stage it will probably have wandered far enough north to be interacting with the jet stream.

Rather like jolting a skipping rope, the downstream ripples can be hard to predict.

One possibility is that Cristobal will throw up a large ridge of high pressure ahead of her, this ridge easing to the west of the UK through the first few days of September.

Llun 8 Medi—Sul 21 Medi
The equinox approaches

With the children back to school, there's no disguising the fact that the seasons are changing. Indeed it won't be long before the nights are as long as the days. Weatherwise, that doesn't mean that we have to give up on the prospect of some warmth.

Given the uncertainties surrounding Cristobal, it would be unwise to be too prescriptive at this range. So expect both rain and shine. Nights will get chilly when the skies clear, but they may not be clear for long - we're heading to the season of mists (and mellow fruitfulness) of course.

Wythnos nesaf

The harvest is coming to an end. Will the weather help all to be safely gathered in?

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 1 Medi

Crynodeb

Iau 28 Awst Cyhoeddwyd am 04:35

Crynodeb

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

Showery rain crossing the country. Sunshine either side.
Today

A band of showery rain across western areas this morning will move eastwards, reaching central areas by midday. Some heavy bursts at times, especially northern England. However, remaining dry for many eastern and southeastern parts. Sunshine away from the rain.

Tonight

A dry start to the night for most. Turning wet and windy for many northwestern areas through the early hours, and breezy elsewhere with a few showers in the west.

Friday

Windy with heavy, blustery showers in the northwest. Breezy elsewhere, with scattered showers, mainly towards the west.

Outlook for Saturday to Monday

Showers and wind easing from the west through Saturday. Mainly fine on Sunday. Monday cloudy with patchy rain in the northwest, drier and brighter further south and east.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 13:21, Iau 28 Aws Mae’r fideo yma ar gael yn Saesneg yn unig.