05/06/2026
Latest 18 GMT NOAA OPC Surface Analysis
Dadansoddiad Arwyneb NOAA OPC Diweddaraf 18 GMT
Technical:
This is UKSWN text analysis from this evening’s NOAA chart showing a Atlantic Storm System (988mb) that was located about 400 miles southwest of Shannon Airport, Ireland, which had an Occluded surface front draped to a Frontal Zone near the Celtic Sea with a narrow Warm Sector extending into Brittany, France and the Atlantic surface Cold front swings through south of the Azores; also a Longwave Surface Trough extends from 46.50 North x 12.25 West and extending through the Azores at 37.85 North x 28.50 West. There was an Atlantic Gale low (1002mb) that was located about 1725 miles east-northeast of Cape Race Newfoundland, Canada, which had a surface Cold front slide towards a Frontal low south of Cape Race and a Stationary Boundary extends to 47.75 North x 25.20 West. Finally the Azores surface high (1028mb) which continues to ridge into Central and Western Europe.
Nowcast/Futurecast:
Bands of moderate to heavy rain will move across parts of Southwestern England and South Wales through tonight and into the overnight hours; elsewhere bands of light to moderate rain will move along the leading edges of the Occluded surface front into Northern Ireland and Wales through tonight, also a few isolated to scattered showers should remain likely across parts of Northern England and Scotland.
The Occluded surface front will continue to move a band of moderate to heavy rain across much of England, the Isle of Man, Northern Ireland and Wales through the overnight hours; elsewhere isolated showers will be possible across Southern Scotland, also an Atlantic surface Cold front will move into Southwestern England by early morning, otherwise it will be mostly cloudy for many; it will remain mild for all at the surface through the overnight hours. The Occluded surface front/Atlantic surface Cold front should continue to spread bands of moderate to heavy rain across England, the Isle of Man, Northern Ireland and Wales; elsewhere a band of light to moderate rain will move into Southern Scotland by morning, otherwise it should remain mostly cloudy for many; it will remain mild for many at the surface through the early morning hours and portions of Scotland becoming chilly. Bands of moderate to heavy rain will continue across much of England, the Isle of Man, Northern Ireland and much of Wales through tomorrow morning; otherwise moderate to heavy bands of showers may track across parts of Southwestern England and South Wales as the center of an Atlantic Gale low tracks over the St George’s Channel toward the mid morning hours, also a band of light to moderate rain continues to lift across Scotland through the morning hours, otherwise it should be mostly to partly cloudy for many; it will be mild for many at the surface through the morning hours with a portion of Scotland remaining chilly. Bands of moderate to heavy rain should continue into the early afternoon hours across much of England, the Isle of Man; however light to moderate band of rain should continue across Northern Ireland and much of Scotland, otherwise it should remain mostly cloudy for many; it will remain mild for all at the surface through the mid-late morning hours.
Will provide a full Nowcast/Futurecast at around 09:00 GMT (10:00 BST) tomorrow morning.
Cymraeg/Welsh
Technegol:
Dyma ddadansoddiad testun UKSWN o siart NOAA heno sy'n dangos System Stormydd yr Iwerydd (988mb) a oedd wedi'i lleoli tua 400 milltir i'r de-orllewin o Faes Awyr Shannon, Iwerddon, a oedd â ffrynt wyneb wedi'i oresgynnu i Barth Ffrynt ger y Môr Celtaidd gyda Sector Cynnes cul yn ymestyn i Lydaw, Ffrainc ac mae ffrynt oer wyneb yr Iwerydd yn siglo trwy'r de o'r Azores; hefyd mae Cafn Arwyneb Ton Hir yn ymestyn o 46.50 Gogledd x 12.25 Gorllewin ac yn ymestyn trwy'r Azores ar 37.85 Gogledd x 28.50 Gorllewin. Roedd isafbwynt Gwynt yr Iwerydd (1002mb) a oedd wedi'i leoli tua 1725 milltir i'r dwyrain-gogledd-ddwyrain o Cape Race Newfoundland, Canada, a oedd â llithro ffrynt oer wyneb tuag at isafbwynt Ffrynt i'r de o Cape Race ac mae Ffin Sefydlog yn ymestyn i 47.75 Gogledd x 25.20 Gorllewin. Yn olaf, uchafbwynt wyneb yr Azores (1028mb) sy'n parhau i gribio i Ganol a Gorllewin Ewrop.
Nowcast/Futurecast:
Bydd bandiau o law cymedrol i drwm yn symud ar draws rhannau o Dde-orllewin Lloegr a De Cymru drwy heno ac i mewn i oriau'r nos; mewn mannau eraill bydd bandiau o law ysgafn i gymedrol yn symud ar hyd ymylon blaenllaw'r ffrynt wyneb wedi'i guddio i Ogledd Iwerddon a Chymru drwy heno, hefyd dylai ychydig o gawodydd ynysig i wasgaredig barhau i fod yn debygol ar draws rhannau o Ogledd Lloegr a'r Alban.
Bydd y ffrynt wyneb wedi'i guddio yn parhau i symud band o law cymedrol i drwm ar draws llawer o Loegr, Ynys Manaw, Gogledd Iwerddon a Chymru drwy oriau'r nos; mewn mannau eraill bydd cawodydd ynysig yn bosibl ar draws De'r Alban, hefyd bydd ffrynt oer wyneb yr Iwerydd yn symud i Dde-orllewin Lloegr erbyn y bore cynnar, fel arall bydd yn gymylog yn bennaf i lawer; bydd yn parhau'n fwyn i bawb ar yr wyneb drwy oriau'r nos. Dylai'r ffrynt wyneb wedi'i guddio/ffrynt oer wyneb yr Iwerydd barhau i ledaenu bandiau o law cymedrol i drwm ar draws Lloegr, Ynys Manaw, Gogledd Iwerddon a Chymru; mewn mannau eraill bydd band o law ysgafn i gymedrol yn symud i Dde'r Alban erbyn y bore, fel arall dylai aros yn gymylog yn bennaf i lawer; Bydd yn parhau'n fwyn i lawer ar yr wyneb yn oriau mân y bore a rhannau o'r Alban yn mynd yn oer. Bydd bandiau o law cymedrol i drwm yn parhau ar draws llawer o Loegr, Ynys Manaw, Gogledd Iwerddon a llawer o Gymru tan fore yfory; fel arall gall bandiau o gawodydd cymedrol i drwm olrhain ar draws rhannau o Dde-orllewin Lloegr a De Cymru wrth i ganol gwynt isel yr Iwerydd olrhain dros Sianel San Siôr tua chanol oriau'r bore, hefyd mae band o law ysgafn i gymedrol yn parhau i godi ar draws yr Alban yn ystod oriau'r bore, fel arall dylai fod yn bennaf i gymylog yn rhannol i lawer; bydd yn fwyn i lawer ar yr wyneb yn ystod oriau'r bore gyda rhan o'r Alban yn parhau'n oer. Dylai bandiau o law cymedrol i drwm barhau i oriau cynnar y prynhawn ar draws llawer o Loegr, Ynys Manaw; fodd bynnag, dylai band ysgafn i gymedrol o law barhau ar draws Gogledd Iwerddon a llawer o'r Alban, fel arall dylai aros yn bennaf gymylog i lawer; bydd yn parhau'n fwyn i bawb ar yr wyneb trwy ganol i ddiwedd oriau'r bore.
Byddwn yn darparu Nowcast/Futurecast llawn tua 09:00 GMT (10:00 BST) bore yfory.
