The Met Office is warning of the possibility of torrential downpours, strong winds and thunderstorms for Derbyshire on Friday.
A yellow warning for thunderstorms has been issued for between 2pm and 11.45pm on Friday.
It states: "There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds
"Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services
"Spray and sudden flooding could lead to difficult driving conditions and some road closures
"There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost
"Whilst many places are likely to remain dry, there is the potential for thunderstorms to develop during Friday afternoon, lasting well into the evening.
"Where these occur expect torrential downpours with a much as 30 mm of rainfall in 1 hour and 60 mm in 3 hours. Large hail and strong, gusty winds will be additional hazards."