The Met Office has issued a yellow weather warning for the the risk of scattered thunderstorms and heavy downpours in the Anglia region on Tuesday night into Wednesday.
The warning is in force in the south of the Anglia region from 5pm on Tuesday 18 July extending to the whole Anglia region from midnight.
It will remain in force until 8pm on Wednesday 20 July 2017
The Met Office says thundery showers are expected to push north across southern parts of the UK through Tuesday evening, perhaps turning more widespread towards midnight.
Forecasters say that although many places won't see these showers, there is a chance of localised flooding of homes, businesses and susceptible roads.
Frequent lightning may be an additional hazard with potential disruption to power networks. Similarly, but very locally, hail may cause impacts.
The animation shows the rain forecast from 9pm on Tuesday until 3pm on Wednesday
The text of the Met Office weather warning for Wednesday 19 July 2017:
"Scattered thunderstorms with locally intense downpours will continue to move north across England and Wales in the early hours of Wednesday morning.
"Although the thunderstorms may tend to ease from the south later in the night, further, possibly severe storms may break out again on Wednesday afternoon.
"These appear more likely across central and eastern parts of England.
"Although many places will miss the thunderstorms, there is a chance of some localised flooding of homes, businesses and roads.
"Frequent lightning may be an additional hazard with potential for disruption to power networks. Large hail may be an additional hazard on Wednesday afternoon."