A yellow weather warning has been issued in North Wales.
The Met Office says "severe thunderstorms are expected" across Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Anglesey, Powys and Wrexham today.
People are being told to be aware of the risk of flash flooding with some places to see as much as 30mm of rainfall in an hour.
The warning runs until 9pm tonight.
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Tuesday is being billed as the hottest day of the year so far, so it's very hard to believe that a yellow weather warning has been issued for rain.
It is valid between 5pm on Tuesday evening and runs until 9pm on Wednesday.
It covers much of North Wales including Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Anglesey, Powys and Wrexham.
Some places could see as much as 30mm of rainfall in an hour.
The Met Office said there was the potential for "severe thunderstorms" across Wales, northern England and the Midlands.
Hot, moist air spreading north and northeast across the western side of the UK is expected to produce thunderstorms later on Tuesday, these then transfer erratically northeastwards during Wednesday.
Rainfall will be very variable, and the extent of the thunderstorms is uncertain, but some places could see around 30mm in an hour and more than 50mm in a few hours.
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Forecasters say a mini-heatwave will see the temperature rise in parts of Wales to 30C (86F) today.
Yesterday saw Cardiff reach 28.7C (84F) although Mid and West Wales are expected to see the highest temperatures today.
But the hot and humid air is expected to trigger thunderstorms across much of the UK from this evening until late on Wednesday, with a severe weather warning for rain and the possibility of flash-flooding.
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