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Rhybuddion

Mawrth 28 Chwefror Cyhoeddwyd am 11:08

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

YELLOW WARNING OF ICE for Northern Scotland

Updated 28 February at 10:15

Valid from 22:00 on 28 February to 09:00 on 1 March

Frequent wintry showers and falling temperatures are likely to lead to some icy surfaces later on Tuesday and early on Wednesday morning.

As an additional hazard, sleet and snow showers are expected to fall to increasingly low levels, more frequently so across the Northern Isles, Hebrides and Northwest Highlands. Up to 2 cm may accumulate, mainly above 100 m, away from northern coasts, with 2-5 cm over higher ground.

Expect difficult driving conditions on untreated roads as well as slippery conditions on pavements and cycle paths.

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 28 February

There are no flood warnings in force anywhere in the United Kingdom.

Ynglŷn â Rhybuddion Tywydd y Swyddfa Dywydd

Mae’r Swyddfa Dywydd yn rhybuddio’r cyhoedd a’r rhai sy’n ymateb i argyfyngau o dywydd garw ac enbyd a allai fod yn beryglus i fywyd neu a allai gael effaith eang, drwy’r Gwasanaeth Rhybudd Tywydd Garw Cenedlaethol (NSWWS).

Mae’r Swyddfa Dywydd yn darparu rhybuddion am law, eira, gwynt, niwl a rhew. Bydd lliw yn cael ei roi i bob rhybudd, yn dibynnu ar gyfuniad o debygrwydd hyn yn digwydd a’r effaith gallai ei gael.

Am fwy o wybodaeth, darllenwch Ganllaw Rhybuddion Tywydd y Swyddfa Dywydd (dolen 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 27 Chwefror Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Spring arrives

In stark contrast to the prevailing dry and settled theme of the majority of winter 2016/2017, the last full week of the climatological winter brought dangerous Storm Doris across the shores of the UK, which had some locally devastating impacts. Winds widely gusted to 60 to 70 mph, and even higher in some exposed locations, in addition to some heavy rain for many areas.

As we look ahead into first few days of Spring, although perhaps not as intense, the weather still has the potential to be eventful, with some heavy showers and blustery winds anticipated at times this coming week. Indeed, the unsettled theme looks likely to continue into the middle of March, although there will doubtless be quieter interludes at times, and perhaps a colder spell towards the end of the month.

Read on to find out the details ...

Llun 27 Chwefror—Sul 5 Mawrth
Chilly and showery at first, a touch milder later

The week will get off to a chilly start, as a slow moving area of low pressure and its associated cold air drifts in from the northwest. Heavy and often thundery showers will affect most parts of the UK through Monday, although some good spells of sunshine can be expected in between such showers. The showers will turn wintry at times, even to low levels, and particularly across the northern half of the UK, where there could even be some settling of snow on higher ground. Frost will be particularly prevalent overnight into Tuesday, along with some patchy ice.

Tuesday will be a similarly showery day, but although the showers will be just as wintry, they are unlikely to be as heavy.

Through the midweek period, conditions will settle down across the north of the UK, but it will remain cold. Further south, weather fronts are expected to cross from the west at times, with a slightly milder feel developing.

Through Friday and into Saturday, another Atlantic weather system is expected to move up from the south, introducing the possibility of a spell of heavy rain to many areas for a time. Any rain on Friday and into Saturday could also briefly turn to snow over higher ground in the north. An unsettled theme is expected to continue through Sunday across most parts.

Llun 6 Mawrth—Sul 12 Mawrth
Still changeable but changes happening more slowly

With low pressure still anticipated to be centred just to the west of the UK, it is likely that the first full week of March will start on an unsettled note, with bands of rain moving up from the south or southwest at times. Any wet spells will be followed by drier interludes and a few showers. It is likely that the northern half of the UK will be colder than the March average for much of the time, so some periods of (chiefly hill and higher ground) snowfall are possible, both from rain bands and any following showers. Milder conditions are expected across the south. The colder regions of the UK are likely to experience some overnight frosts, with patchy fog also possible at times.

As we progress through this period, it is possible that although the changeable theme will remain, the changes in weather will tend to be slower, with lengthier dry spells in between weather systems.

Confidence in this forecast scenario is reasonable. However, some computer model solutions do hint at the possibility of an extensive anticyclone centred broadly to the north of the UK drifting close to or over northern and eastern areas of the UK. Should the high move in this fashion, a cold east to southeasterly flow will develop across all parts of the UK, resulting in widespread cold, settled conditions with overnight frosts, bright days and the possibility of coastal showers in the east.

Llun 13 Mawrth—Sul 26 Mawrth
A chilly end to March?

Moving into the second half of March, the suite of different of computer models that we utilise to produce the longer range forecast are offering an unusually broad range of different forecast solutions. This broad range does not inspire particular confidence in any given individual forecast solution. That said, the solutions can be broadly grouped into two categories; those that allow the continuation of Atlantic weather systems moving across the UK to bring a succession of wet and windy spells followed by drier interludes, and those where an anticyclone centred over Scandinavia brings colder, drier weather to our shores from the east. At time of writing, the former scenario is slightly favoured, but there are increasing signs that as we move towards the end of March, a colder, drier and more settled theme could well begin to develop. As always we will continue to monitor trends in the forecast model and keep you updated.

Wythnos nesaf

If high pressure does set in across the UK towards the end of March, a typically showery start to this coming April will not happen. Be sure to stay up to date with the latest thinking on April's weather, and all other weather matters, by staying in touch with the BBC Weather Centre.

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 6 Mawrth

Crynodeb

Mawrth 28 Chwefror Cyhoeddwyd am 01:41

Crynodeb

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

Cold, unsettled and windy.
Today

The east and far north start dry with sunny spells, but showers in the west will eventually spread into most areas, as well as some hill snow further north. Winds will increase and become strong on western coasts.

Tonight

Showers easing for most, aside from the north of Scotland. Winds easing, and cold again, although not as cold as last night. Rain arrives in the far south-west towards dawn.

Wednesday

Band of rain spreading north through southern and central parts, but mostly dry with sunshine and the odd shower elsewhere. Winds increase again in the far south-west later.

Outlook for Thursday to Saturday

Unsettled with further bands of rain affecting the country with strong winds at times. Some brief brighter, drier spells. Cold in the north with night frosts. Milder in the south.

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