The forecaster said thunder and lightning, "torrential rain", "large hail" and flooding could occur as the stormy conditions spread into the north-east.
However, temperatures today are expected to peak above 30°C again, before dipping overnight.
Temperatures are forecast to be in the mid-30s for much of east and south-east England, reaching 37C in London, and could rise higher still if there is a lot of sunshine, Met Office meteorologist Alex Deakin said. The Royal College of Nursing (RCN) said high temperatures in hospitals were leaving nurses exhausted, sick and dizzy.
Amid tinderbox conditions, 56 fires were reported on grass verges next to England's motorways and a combine harvester caught alight in Nottinghamshire, scorching a field.
The Environmental Audit Committee also encouraged employers to relax dress codes, allow flexible working during warm weather and changing building regulations to prevent people from overheating.
The Met Office has issued a yellow weather warning for Yorkshire and the Humber, as thunderstorms are expected to hit between 2pm and 11.45pm on Friday July 27.
Edinburgh's soaring temperatures (peaking at 26C) will drop down to around 20C tonight as cloud cover rolls over the clear skies.
The Met Office says temperatures will keep rising into Friday and the UK's all-time temperature record of 38.5C (101F) - set in Kent in August 2003 - could be beaten.
"Large hail and strong, gusty winds will be additional hazards". Heavy rain and thunderstorms in the small hours of tomorrow will continue to bring the temperature down, making for a slightly cooler and rainy weekend in the capital, with some sunny intervals.
Where the thunderstorms occur, torrential downpours are possible, with as much as 30mm of rainfall in an hour and 60mm in three hours.
Hot with driest conditions in the west, thunderstorms in east.
Facebook's daily active users for the quarter were 1.47 billion, shy of the 1.49 billion forecast by StreetAccount and FactSet . The after-hours trading was on lower-than-expected revenue numbers from its second-quarter earnings report .
These sanctions were already in place but were suspended whilst the United States was a party to the nuclear deal. He does know those tweets don't just disappear, right? But, if anything, it at least concerns them a great deal.
But, she said, BRICS may use that adversity to seek to build a new world order, even beyond the five-member bloc. He will participate in the two-day BRICS Summit, whose theme this year is "BRICS in Africa".
SKAI TV news reported that residents and vacationers fled to nearby beaches in Rafina, where they were rescued by the coast guard. The prime minister, Tsipras , cut short his visit to neighboring Bosnia on Monday and quickly returned to Athens .
The team tweeted a photo of the boy with two baseballs, including one signed by All-Star second baseman Javy Baez. However, a later report suggested that the man gained notoriety based on the case of misunderstanding.
Cohen can be heard on the recording saying he needs to start a company to transfer information, and says he'll need financing. In sum, the first released Cohen tape gives the public and investigators a glimpse into the shady fix-world of Cohen.
Fiat Chrysler CEO Mike Manley has paid tribute to Sergio Marchionne , saying news of his death is "heartbreaking". Cape Town - Former Ferrari boss Sergio Marchionne has passed away after a brief illness.
Her boyfriend and a doctor who was in the restaurant attended to the woman who was shot in the thigh. People signed a makeshift memorial reading: "We are Danforth strong".
USA prepares new sanctions against Russian Federation
In the declaration, Pompeo took Russian Federation to task for it actions in Ukraine, particularly the 2014 annexation of Crimea. But Russia also did not immediately jump at the opportunity to schedule a second summit between the two leaders.
Zoo accused of painting a donkey, passing it off as a zebra
In 2009, a zoo in Gaza painted two donkeys with black stripes to circumvent an Israeli restriction on the importation of animals. The zoo denied the allegations, with the zoo's director, Mohamed Sultan, insisting the zebras were not fakes.
Pakistan cricket star Imran Khan leads amid slow vote count
The Pakistani election has been marred by allegations of fraud and militant violence after voters took to the polls on Wednesday. At least 31 people were killed in a suicide bombing outside a polling station in the southwestern Baluchistan province.
Hamilton rewards Mercedes with epic win in Germany
But, at the team's home race, Mercedes called off the fight: "Valtteri, this is James (Vowles - chief strategist)". It was important to score the double podium, the one-two, to recover some of the points we lost through bad luck".
Search continues for missing Iowa woman
Posters of the University of Iowa student can be seen around the small city of 1,500. However, with the extremely rural terrain, full of corn rows, it has not been easy.