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A Flood Warning has been issued by the Environment Agency for Spixworth Beck from, and including Horsham St Faith to Crostwick to the north of Norwich.
Flooding is expected for Beck Lane Ford at Horsham St Faith.
The Environment Agency says the general area is also covered by a Flood Alert.
– Environment Agency
"We are seeing high river levels on the Spixworth Beck due to localised heavy thunderstorms. River levels are likely to continue to rise. Over the next 12 hours the forecast is for further thunderstorms. We are continuing to monitor the situation closely, working alongside partners including the Met Office and local authorities."
The Environment Agency has issued a flood warning for the River Roach, Prittle Brook and Eastwood Brook at Southend in Essex
The Environment Agency says immediate action is required and that properties are expected to flood along Prittlebrook, particularly Sutton Court Drive.
There's also a warning about waterside properties in Rochford, particularly Oak Road and St Andrews Road.
There are train delays of up to an hour on Greater Anglia services between Stratford and Southend Victoria in Essex due to lightning strike.
Lines in both directions are blocked and trains may be delayed by up to 60 minutes. Engineers are en route to assess the problem.
A teenager has died after becoming ill at Latitude this weekend.
The man, who was in his late teens, had to be air lifted to hospital from the festival site at Henham Park near Southwold at about 4.30pm on Saturday.
Organisers confirmed he had died in the early hours of this morning due to an "isolated medical condition".
It happened as more than 35,000 people attended each of the festival's three sold-out days.
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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There is a Met Office yellow weather warning in force for further heavy rain and thunderstorms across the Anglia region on Sunday.
The warning says: "Further heavy, thundery showers are likely to develop in some eastern parts of the UK today. Although many places within the warning area will stay dry, where storms do occur, torrential downpours are possible with lightning, hail and perhaps locally strong wind gusts. The most likely areas for local disruption are across parts of eastern and southeastern England."
The weather warning is valid until 11.55pm on Sunday 20 July 2014
– Met Office Chief Forecaster's Assessment
"The remnants of the very warm, humid, unstable airmass are still affecting eastern and some central parts of the UK today. As a result, further thundery showers are likely to develop across these parts in response to daytime heating today. There remains some uncertainty regarding exactly where these may develop and, as often happens in this situation, some areas will stay dry."
A teenager is in a fighting for his life in hospital this morning after becoming ill at Latitude this weekend.
He had to be air lifted to hospital from the festival site at Henham Park, near Southwold, at about 4.30pm on Saturday.
A spokesman for the East Anglia Air Ambulance said he had become "acutely unwell and was treated on the scene by EAAA medics".
The man, who is in his late teens, arrived at the Norfolk and Norwich University Hospital just after 5pm.