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Rhybuddion

Mawrth 2 Medi Cyhoeddwyd am 00:12

Rhybuddion DU

Rhybudd Tywydd

Cyhoeddwyd gan y Swyddfa Dywydd

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

Tuesday 2nd September 2014

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

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 2nd September 2014

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 1 Medi Cyhoeddwyd am 10:00

Rhagolwg Misol

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

Crynodeb
Better than August!

Summer 2014 had been warmer and drier than normal, until August came along. August 2014 was much cooler and wetter than normal. In fact it was the coolest August for over twenty years and also made the top twenty wettest Augusts on record. But with August behind us, we can now look forward to a September that promises to bring an improving weather picture for many.

Llun 1 Medi—Llun 8 Medi
Mostly dry with some sunny spells

Pressure will build during the first week of September with the weather often dry. The amount of cloud however, will vary day to day. In any sunshine the weather will become locally warm for the time of year, with temperatures reaching the twenties, perhaps the mid-twenties given there will be some lengthy sunshine later in the week.

By Friday there is increased uncertainty in the forecast, with a chance of some rain in approachng the southwest. Otherwise the weather will stay settled.

Llun 8 Medi—Llun 15 Medi
Warmth might hold on in the south

Changeable conditions are most likely into the following week, with variable amounts of cloud. There will be some bright or sunny spells, but also showers or rain at times, particularly over central and eastern parts. Temperatures ranging from near normal in the north to rather warm in the south.

Llun 15 Medi—Llun 22 Medi
Typical September weather

During mid to late September most regions can expect to see periods of fine weather, with some warm sunshine at times. However, these fine periods may well be interspersed with occasional spells of cloudier, more unsettled conditions bringing showers or longer spells of rain.

Northern and western parts are probably most likely to see the more frequent bouts of unsettled weather, whilst southern and eastern parts should see the better fine and dry spells. Daytime temperatures are likely to be above average during fine weather which will leave conditions feeling pleasantly warm. Nights, however, may well be on the chilly side. During any unsettled weather, daytime temperatures are more likely to be near or below average leaving conditions feeling cool.

Wythnos nesaf

The weather at the end of the month is uncertain.

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 8 Medi

Crynodeb

Mawrth 2 Medi Cyhoeddwyd am 03:37

Crynodeb

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

Sunny spells in the west, cloudier in the east.
Today

Early mist and fog patches will clear this morning, then northern and western areas will remain mainly dry with warm sunny spells and light winds. Probably cloudier in parts of eastern and central England, with the odd light shower possible.

Tonight

It will remain mostly dry overnight, with light winds, but further low cloud, mist or fog patches are likely to form in places.

Wednesday

Early mist and fog patches will lift and break, then it will be another mainly fine and dry day with variable amounts of cloud and some warm sunny spells.

Outlook for Thursday to Saturday

Remaining largely fine, with variable cloud allowing some warm sunny spells at times. Cloud may occasionally be thick enough for some light rain or drizzle.

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UK Fideo Rhagolwg

Rhagolwg UK Diweddarwyd 07:53, Mawrth 2 Med Mae’r fideo yma ar gael yn Saesneg yn unig.