Meanwhile sun worshippers in the United Kingdom have sizzled in the hottest temperature of the year so far, with a scorching 33.3C recorded in England yesterday.
Where these take place, torrential downpours with a much as 30 mm of rainfall in 1 hour and 60 mm in 3 hours could occur.
The amber weather warning, which covers large swathes of England, advised people to avoid lengthy periods of sun exposure between Monday and Friday.
An amber "heat health watch" warning has been issued for parts of England.
Monday was the hottest day of the year so far, with 33.3C (91.9F) recorded in Santon Downham, Suffolk. Keep your home as cool as possible - shading windows and shutting them during the day may help.
The Met Office predicts that temepratures will hit at least 37C in parts of the United Kingdom during Friday.
Nurses have warned that some hospital wards have reached more than 30C (86F), leading to patients and relatives passing out or vomiting.
FLIR SWELTER The conditions at Covent Garden. On the right is temp in C
Becky Mitchell, Met Office meteorologist, said temperatures of 35°C were forecast for Thursday in East Anglia and London, adding: "There's potential it could go even warmer than that".
Mr Burkill also said that temperatures above 34C "can't be ruled out".
The longest dry spell this year is Brooms Barn, near Bury St Edmunds, where there hasn't been a drop of rain for 45 days.
Following the driest first half of summer on record, farming leaders warned crops are being hit and livestock are having to be fed with feed that should be held for winter as grasslands are parched.
England could see the all-time July record of 36.7C broken this week.
Met Office is warning that there is a 90 per cent probability of heatwave conditions across Portsmouth and Hampshire over the coming days.
Toronto shooting: 1 dead, 13 injured in Canada gunfire, gunman kills himself
Officials are urging any witnesses to come forward and for anyone who may have security video or dashcam video to contact police. A bomb disposal robot is seen deployed inside the police cordon near the scene of a mass shooting in Toronto on July 23, 2018 .
Mystery Egyptian Sarcophagus Is Finally Opened
The granite casket, which had been sealed, was thought to be the largest ever found in the Egyptian port city of Alexandria . Now experts will prise open the ancient sarcophagus in the hope new secrets will be uncovered .
Amazon faces web issues globally on Prime Day sale
Shoppers were anticipated to spend 40% more , up to $3.4 billion, on Amazon during the 36-hour promotion this year. Prime Day kicked off at 3 p.m. on Monday, but shoppers reported experiencing issues within a few minutes.