Warm humid conditions have sparked thundery downpours in the south of the Anglia region in parts of south Bedfordshire and north Hertfordshire spreading into Essex and Suffolk.
The Met Office says the risk of thunderstorms could last into Sunday evening with the potential for localised surface water flooding. Heavy showers could hit any part of the Anglia region.
Nearly 5 mm of rain was recorded in one hour at 4pm in Harpenden in Hertfordshire.
Temperatures in the Anglia region at 4pm on Sunday 3 May 2015
- 20.4°C in Santon Downham, Suffolk
- 19.2°C in Weybourne, Norfolk
- 19.0°C in Monks Wood near Sawtry, Cambs
- 18.9°C in Cavendish, Suffolk
- 18.9°C at Norwich Airport
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It's been a day of clearing up for hundreds of people after flash flooding hit the region over the weekend.
In Essex more than 200 homes were affected - while the storms and sudden downpour also caused problems for more than 60 homes in and around Norwich.
In both cases residents are calling for action to prevent a repeat.
Click below to watch a report from ITV News Anglia's Tanya Mercer
People are beginning the clear-up after flash flooding caused damage across the region yesterday.
In Essex there are calls for an investigation after 200 homes were flooded on Canvey Island.
More than two inches of rain fell but at the same time the pump system that takes water out into the Thames Estuary failed because of a lightning strike.
Meanwhile, Norwich was the wettest part in the UK and several homes were flooded.
Residents want to see more done so the city can cope better with flash flooding in future.
"The last few summers, they've been fairly dry.
So, they seem to have left the drains and not serviced them, but not just in this area, it seems around the city as well.
What they are now doing is reactive.
If it was preventative, maybe it would never have flooded in the first place."
Parts of Norwich saw a month's worth of rain falling in a hour on Sunday causing flash flooding in some parts of the city. Norwich was the wettest place in the UK.
Norwich airport recorded 46 mm (1.8 inches) of rain between 3pm and 4pm which is more than normally falls in three weeks.
An unofficial reading in the Carrow Road area reported 57 mm in half an hour.
The torrential downpours were isolated with some areas in the Anglia region escaping with very little rain.
Rainfall totals between 10am and 10pm on Sunday 20 July 2014
- 48.6 mm at Norwich airport
- 29.4 mm in Shoeburyness, Essex
- 23.6 mm at Monks Wood near Sawtry, Cambs
- 13.2 mm in Wittering, Cambs
- 5.0 mm in Cavendish, Suffolk
- 2.8 mm in Bedford
- 2.6 mm in Cambridge
- 1.4 mm in Writtle, Essex
- 0 mm in Marham, Norfolk
- 0 mm in Northampton
- 0 mm in Woburn, Beds
Last night's storms have been followed by torrential downpours and flash flooding today. Here are some more of your photos.Read the full story ›
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.
"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.
The dramatic weather has continued. Fire services have been inundated with reports of flash floods after the afternoon's downpours.Read the full story ›
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.
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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