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Rhybuddion

Mawrth 21 Hydref Cyhoeddwyd am 00:00

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Tuesday 21st October

YELLOW WARNING of WIND

Gales, and more locally severe gales, are expected to affect much of the country on Tuesday. Whilst Monday night will see wet and windy conditions sweeping eastwards, the strongest winds are expected to occur after the rain clears and winds veer northwesterly through Tuesday morning. Gusts exceeding 55 mph are likely inland, with 60 to 70 mph gusts in some exposed coastal areas in the west and possibly to around 80 mph around coasts in northern Scotland.

The public should be aware of the potential for disruption to travel and possible damage to trees. Difficult driving conditions will result, perhaps exacerbated by surface water and spray in places. This is an update of the warning first issued on Saturday, including adjustments to the areas at risk, and a slight increase to expected windspeeds, taking into account the latest information.

Valid from 0015 to 1800 on Tuesday.

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.

Tuesday 21st October 2014

There are flood warnings in force across the following locations:

SCOTLAND (1)

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 04:42

Crynodeb

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

Rain clearing southeast, then sunny spells and squally showers. Gales.
Today

Gales with severe gales around exposed coasts. The rain from overnight soon clears southeast, then colder conditions with squally showers and a risk of hail and thunder spread across the UK. Showers become wintry over the hills in the northwest.

Tonight

Showers becoming more isolated overnight, with clear skies developing across much of the UK. Cold with a grass frost possible in places. Further rain in the far northwest by dawn.

Wednesday

Becoming cloudy across the UK but with rain moving east across northern parts. Staying dry in the south. Milder than on Tuesday. Windy for all with gales in the north.

Outlook for Thursday to Saturday

Less windy with rain in western parts Thursday and some more widespread rain over England and Wales Friday. A brighter day here Saturday. Windy with blustery showers throughout in northwest.

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Rhagolwg UK Diweddarwyd 07:58, Mawrth 21 Hyd Mae’r fideo yma ar gael yn Saesneg yn unig.