The Met Office issued a new warning for thunderstorms on Monday for large parts of Wales. Rain, thunder and lightning swept across parts of the UK overnight.
And now the forecasting agency has warned of more to come on Monday night into the early hours of Tuesday morning.
The warning states that the thunderstorms are likely to develop across parts of southwest England and Wales during Monday afternoon and "become more organised" through the evening.
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The yellow warning adds: "Lines of thunderstorms are expected to then move north during the early hours of Tuesday and gradually weaken as they clear into northern England before dawn.
"Whilst some places will see little or no rainfall, a few locations may see torrential rain with 20-30 mm falling in one hour and 50-80 mm in 3 hours. Additional hazards accompanying stronger thunderstorms include frequent lightning, hail and gusty winds, particularly during the evening period."
There were thunder and lightning strikes reported across London and south-east England, south-west England, most of Northern Ireland, large parts of Wales, east of England, Northamptonshire and Warwickshire.
The Met Office says the conditions will clear up for many this morning before showers return later for some south and central parts.
Here is the map of the warning area:
The areas covered by the new warning, which is in place from 2pm on Monday to 2am on Tuesday, in Wales are:
- Blaenau Gwent
- Bridgend
- Caerphilly
- Cardiff
- Carmarthenshire
- Denbighshire
- Flintshire
- Merthyr Tydfil
- Monmouthshire
- Neath Port Talbot
- Newport
- Powys
- Rhondda Cynon Taf
- Swansea
- Torfaen
- Vale of Glamorgan
- Wrexham.
An area of low pressure is set to bring sunshine and showers to Wales throughout the week.
The Met Office forecast for the region this week says: "Staying unsettled with sunshine and showers throughout. Showers potentially heavy at times with brisk winds, hail and thunder, leading to the risk of some localised flooding."
The unsettled theme continues because the low pressure is sitting to the southwest maintaining a feed of warm and moist air initially from the continent, but by mid-week, from the Atlantic. Though the main theme is unlikely to change, the details are still evolving.
Deputy Chief, Jason Kelly added: “Whilst we are confident that low pressure will dominate the weather this week, the day-to-day forecast is not certain at this stage. But more generally, each day there will be a risk of showers or longer spells of rain for many areas of the country.
"It is likely that more prolonged showers will bring a risk of thunderstorms too. And in some areas, most likely in the southwest, rainfall totals will build through the week.”
Temperatures are expected to continue to remain above average, with many areas in the low 20s Celsius by day and the mid-teens Celsius by night.
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