Weather forecasters are warning of “very significant disruption” in Derbyshire because of thunderstorms triggered by the current heatwave.
The Met Office has issued a yellow ‘be aware’ alert of rain for Derbyshire between 4pm and 11.50pm on Wednesday.
A Met Office spokesman said: “By Wednesday, a hot and increasingly humid airmass is expected to be in situ across much of the UK.
“This airmass looks conducive to isolated thunderstorm development during the afternoon and into the evening.
“With large amounts of energy available in the atmosphere, storms could be severe, with torrential downpours and hail of up to 1cm in size.
“20 to 30mm of rain is possible in less than an hour, with as much as 60mm possible in three hours very locally.
“The public should be aware that there is a chance of some very localised significant disruption.”