Thunderstorms have started to break out over eastern parts of Norfolk, Suffolk and Essex.
The Met Office has a yellow weather alert in force warning of torrential thundery downpours in places with the risk of surface water flooding. There's also the possibility of hail and strong gusts of wind.
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After a dry and hot spell last week, the weather changed to bring more than a month's worth of rainfall in 24 hours.
It will be a grey day with outbreaks of rain. The rain will be heavy at times in the north but further south it should turn drier
Some parts of the Anglia region have seen nearly a month's worth of rain in less than a day as a deluge breaks a three-week drought.