Lightning, hail, strong gales, and thunderstorms will batter the country today.
Brits are being warned more 'thundery' showers and torrential downpours are on the way as the Met Office extends its yellow weather warning.
The initial warning ran from Sunday afternoon until Monday morning, but another alert has been issued and is in place until this evening.
A second alert is in place for thunderstorms, to begin at 12pm today until 10pm, with "scattered torrential thundery downpours" impacting those in the highlighted areas.
Residents may see flooded roads, disruptions to public transport, and lightning strikes.
In some places, there may also be power cuts due to adverse weather.
It comes after Brits endured a miserable washout weekend, with areas in the south west and far south seeing more rain.
Now, the lightning storms are forecast to go on for even longer and leaving Monday soggy and wet.
Although the weather service claims 'most' will not see the worst of the thunderstorms, those who do will be lashed with "persistent rain".
The Met Office alert said: "Persistent rain, heavy and possibly thundery at times, will move across southern and southwestern areas of England and parts of south Wales through Sunday afternoon, persisting into Monday morning, before easing.
"20 to 40mm is likely to fall quite widely across the area but a few places could see 60 to 80mm over this period, including 15 to 25mm within an hour. Such totals may cause travel disruption and some flooding."
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Alongside the thunder and lightning, the second warning which lasts until 10pm, is expected to bring hail and strong gales as well.
The areas most likely to be swept up in the weather include the south west of the UK, from Bath down to Plymouth and Cornwall.
The southern parts of Cardiff, Wales, and Bath are also likely to be hit, as well as Portsmouth down to Brighton, according to the latest from the meteorologists.
Looking at the rest of the week, areas are set to be rather cloudy with showers and longer spells of rain.
More thunderstorms are forecast to cause chaos in some places, but the northern parts of England will stay mostly dry with warm sunny spells.
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