Weather warning for thunderstorms issued for Wales
Heavy downpours are expected across eastern parts of the county on Thursday
The Met Office has issued a yellow weather warning for thunderstorms for much of Wales.
Eastern parts of the country are covered by the alert, including Cardiff, Bridgend and Wrexham.
It comes into force at 12am on Thursday and ends at 11.59pm.
Much of the UK set to enjoy "very warm, locally hot weather" over the next few days, forecasters have said.
The Met Office said the mercury could reach up to 32C in London by Tuesday while long-term forecasts remain warm despite the chance of thunderstorms during the week.
The heatwave threshold is met when a location records at least three consecutive days with maximum temperatures exceeding a designated value, according to the Met Office.
The warm surge is down to a wave of high pressure across the country and warm air rising from the south, creating dry, fine and sunny conditions and bringing temperatures up.
Simon Partridge, forecaster at Met Office, said: "There is certainly potential that it could become an actual official heatwave, because in the spells you've had before it hasn't actually met all the criteria.
"If there's not, it's very close to it, and if you're out and about and a member of the public then it's going to feel like a heatwave anyway, because also overnight things are going to turn a little bit more humid and muggy day-on-day as well."
Mr Partridge said: "Usually you get these thunderstorms come through and then everything's a lot cooler and fresher, but although it will be a bit fresher at the end of the week, it will still be about where we should be, if not a degree or so warmer. So a bit of summer is on the cards."