THE Met Office has issued another yellow warning ahead of thunderstorms and heavy rain predicted for the weekend.
The forecaster warns that lightning strikes could cause damage to buildings, with disruption to public transport and flooding also expected in the affected areas.
Friday's alert for thunderstorms covers most of south-west England, parts of Wales, the Midlands and west London and is in place from 12 noon until 8pm.
These areas may see between 15-24 mm of rain per hour before easing on Friday evening.
The second warning for thunderstorms is in place all of Saturday from 1am until midnight on Sunday.
It covers all of Wales and southwest England, the Midlands and parts of south-east England.
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A third weather warning for rain has been issued on Sunday for Wales and central south-west England as affected areas could see between 50mm and 70mm of rainfall over a few hours, accompanied by hail and frequent lightning.
The stormy weather follows a warm, dry spell as temperatures reached 25C in Inverness on Wednesday while southeast England saw the same high on Thursday, according to the forecaster.
The Met Office's chief meteorologist Jason Kelly said: "Thundery downpours have developed across parts of southern England, and will last into Friday evening, bringing frequent lightning, gusty winds, hail and spells of heavy rain.
"The risk of thunderstorms persists into the weekend with potentially longer spells of heavy rain for some along with a continued risk of hail and lightning accompanying the most intense storms.
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"The warnings cover the areas of the country most at risk of seeing thunderstorms but not everyone within a warning area will experience a thunderstorm. For many much of the time it will remain dry."
Met Office forecaster Alex Deakin warned that we're likely to see some "sunshine sparking some heavy, even thundery showers" in the south of England today.
He however noted that the storms would be "hit and miss" and that not everywhere in the yellow warning area would be hit.
The weather service said there would likely be some damage to a few buildings and structures from lightning strikes.
It added that driving conditions may be affected by spray, standing water and/or hail, leading to longer journey times by car and bus.
There may also be some delays to train services, as well as short term losses of power and other services.
It said: "A few thundery showers may be present across southern and southeast England early on Friday, but from the middle of the day they are expected to develop more widely within the warning area.
"Whilst some places will remain dry, where thundery showers do occur, they will bring frequent lightning, gusty winds, potentially some large hail, as well as brief spells of heavy rain.
"15-25 mm of rain fall may fall within an hour, with a very small chance of 30-40 mm falling in 3 hours; the latter most likely across southwest England.
"Showers will tend to ease and fade during Friday evening."
But while their may be a brief break in the storms on Friday evening, Saturday is expected to bring even more bad weather.
The warning issued for tomorrow affects the entirety of the South West, all of Wales, and much of the rest of southern England that lies west of London.
Much of the Midlands is also expected to be hit by the storms.
UK 5 day weather forecast
Today:
Low cloud across England and Wales will break as sunny spells develop, however the cloud is likely to linger across the northeast. Heavy and thundery showers developing across the south. Fine and dry across Northern Ireland and Scotland. Feeling warm.
Tonight:
Evening showers across Wales and the southwest will fade. Low cloud, with drizzle in places across the northeast will expand westwards across central areas. Elsewhere, mostly dry with clear spells.
Saturday:
Largely dry in the north with sunny spells, especially in the northwest. Showers or longer spells of rain across the south, these heavy and thundery at times. Warm for many.
Outlook for Sunday to Tuesday:
Unsettled across the south Sunday and Monday with showers, or longer spells of rain. Mostly dry with sunny spells across the north, but often cloudy. Drier for all on Tuesday.
Deakin warned that these downpours on Saturday could lead to sudden flooding causing difficult driving conditions and some road closures.
In addition, there is a small chance that some communities could become cut off by these flooded roads.
Where flooding or lightning occur, there could also again be delays or even some cancellations to train and bus services.
The Met Office added that there will be a slight chance of losses of power and other services to some homes and businesses.
There is also a small risk that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds.
The small chance of fast-flowing or deep floodwater could also pose a "danger to life".
: "Whilst there is some uncertainty in the details, scattered showers and thunderstorms are likely to develop and spread northwestwards at times later on Friday night and through Saturday.
"While much of the time it will be dry, and not all places will see these, where they do occur 20-40 mm could fall in less than an hour, with a small chance of isolated accumulations of 50-70 mm over the course of a few hours.
"In addition, hail and frequent lightning may accompany the most intense storms, especially during Saturday afternoon and evening in parts of the Midlands, southern England and east Wales."
A yellow weather warning has also been issued for most of the same regions for .
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Showers and thunderstorms are expected to merge into broader areas of heavy rain across parts of Wales, central and southern England.
Again, there is a risk of flooding and transport disruption.
Full list of regions affected by weather warnings
East Midlands
- Derbyshire
- Leicester
- Leicestershire
- Northamptonshire
- Rutland
East of England
- Bedford
- Cambridgeshire
- Central Bedfordshire
- Hertfordshire
- Luton
London and South East England
- Bracknell Forest
- Buckinghamshire
- Hampshire
- Milton Keynes
- Oxfordshire
- Reading
- Slough
- Southampton
- Surrey
- West Berkshire
- Windsor and Maidenhead
- Wokingham
North West England
- Cheshire East
- Cheshire West and Chester
- Halton
- Merseyside
South West England
- Bath and North East Somerset
- Bournemouth Christchurch and Poole
- Bristol
- Cornwall
- Devon
- Dorset
- Gloucestershire
- Isles of Scilly
- North Somerset
- Plymouth
- Somerset
- South Gloucestershire
- Swindon
- Torbay
- Wiltshire
Wales
- Blaenau Gwent
- Bridgend
- Caerphilly
- Cardiff
- Carmarthenshire
- Ceredigion
- Conwy
- Denbighshire
- Flintshire
- Gwynedd
- Isle of Anglesey
- Merthyr Tydfil
- Monmouthshire
- Neath Port Talbot
- Newport
- Pembrokeshire
- Powys
- Rhondda Cynon Taf
- Swansea
- Torfaen
- Vale of Glamorgan
- Wrexham
West Midlands
- Herefordshire
- Shropshire
- Staffordshire
- Stoke-on-Trent
- Telford and Wrekin
- Warwickshire
- West Midlands Conurbation
- Worcestershire