The Met Office has issued a yellow weather warning for the risk of torrential thunderstorms in the East of England as the heat builds.
Up to 60 mm of rain could fall in a few places on top what has already been record June rainfall in some areas.
The Met Office says: "Further thunderstorms are likely, these potentially severe, bringing a risk of flooding and disruption to travel."
What to expect
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
There is a small chance of fast flowing or deep floodwater causing danger to life
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