Blackpool can usually expect highs of 16C and lows of 13C during July, therefore this Thursday's peak of 25C is well above average.
He added: "There is the chance of thunderstorms breaking out over some eastern parts of England on Thursday, but it is Friday when we see intense thunderstorms affecting many central and eastern areas".
Public Health England urged Britons to do their best to stay out of the sun until the heatwave is over - especially between 11am and 3pm. Keep your home as cool as possible - shading windows and shutting them during the day may help.
If there's anybody you know, for example an older person living on their own, who might be at special risk, make sure they know what to do.
NET WEATHER BOILING Temperatures are forecast to reach all-time records this week
The Met Office says there is a 90 per cent probability of heatwave conditions between 9am on Monday and 9am on Friday in parts of England.
After weeks without rain, torrential downpours are forecast to hit parts of the United Kingdom, with as much as 30mm (1.2in) expected to fall in just an hour.
A humid plume of air from Europe, blamed by forecasters for the heatwave, has created the ideal conditions for thunderstorms.
The yellow warning is in place between 2pm and 11.45pm on Friday, July 27.
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The forecast is for scattered thunderstorms - and depending on where they fall, they could interfere with the opening of Sunderland International Airshow on Friday afternoon and evening.
"Large hail and strong, gusty winds will be additional hazards".
With a chance of hail and strong winds alongside the torrential downpours, the temperature could drop back to the high 20s, meteorologist Alex Burkill said.
Health warnings are being issued as temperatures are expected to rise to 35°C by the end of the week.
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Having been a 1/2 shot yesterday, it's now just 1/3 Britain will experience 35C or hotter before the week is out.
During the current heatwave, United Kingdom temperatures have been approximately 10C higher than average for this time of year.
The Committee on Climate Change has repeated its call for new standards on heat risks for new homes, while action is also needed to keep existing houses cool and create more green space in cities to prevent urban overheating, it said.
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