Thunderstorms are being forecast across Essex on Friday.
The Met Office has put a yellow weather warning in place between 2pm and midnight due to the high risk of thunderstorms.
The warning reads: "Most places will be dry but there is the potential for slow-moving thundery downpours in places.
"There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater.
"Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train, bus and tube services, particularly during the evening rush hour.
"Spray and sudden flooding could lead to difficult driving conditions with the possibility of road closures.
"There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost."
The warning covers most of south east England.
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