A yellow weather warning from the Met Office starts at 9am and goes through the day until 7pm.
It covers the entirety of Norfolk and much of the midlands, stretching across areas of the country from Manchester to London.
READ MORE: When will Norfolk be hot and sunny again?
In Norfolk, there will be temperatures between 15C and 20C.
The Met Office has warned there is a chance that lightning strikes could damage buildings and structures.
Spray, standing water and hail could affect driving conditions, causing road delays.
Short-term loss of power and flooding are also possible.
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