A weather warning has been issued for Norfolk and Waveney with predictions of thunderstorms and heavy rain.
The yellow warning is in place from 12midnight to 3pm on August 25, according to the Met Office.
The temperature is due to be about 20C all day across the county
There is a good chance that driving conditions will be affected by spray, standing water and hail which could lead to delays.
Delays are also possible for train services.
The Met Office has also warned of short-term loss of power and other services.
Lightning could potentially damage buildings and structures.
And some flooding of businesses and home is likely, which could lead to damage.
The yellow warning is in place for Norfolk, Suffolk, Essex, Kent, East and West Sussex, London, Surrey as well as parts of Hertfordshire and Cambridgeshire.
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