The Anglia region is included in a Met Office yellow weather warning for the risk heavy rain and localised downpours on Friday and Saturday.
The heatwave has erupted into a string of thunderstorms across the Anglia region. Here is a selection of pictures from ITV Anglia viewers.
The week-long July heatwave in the Anglia region was ended with thunderstorms and torrential rain on Sunday.
If it's safe to take pictures - please email them to firstname.lastname@example.org
The Met Office has issued a yellow weather warning for the risk of heavy thundery rain in parts of the Anglia region.
The warning is valid from noon on Monday until 8pm.
The Met Office says: "Scattered but potentially intense thundery downpours are likely to develop from the middle of the day onwards across this region.
"The public should be aware that where these occur, they could bring a risk of surface water flooding, with hail and gusty winds posing additional hazards locally."
The Met Office chief forecaster's assessment: "Plenty of energy and moisture in the atmosphere again today, but (as often in such situations) it is difficult to pin down the counties most at risk from intense downpours.
"Around 20 mm of rain could fall within an hour at a few locations but the majority of places will see much less."
The Met Office has updated its yellow weather warning for heavy thundery rain on Saturday. The warning covers the whole Anglia region and other areas and is valid until 9pm on Saturday.
The Met Office warning says: "Heavy, thundery rain is expected to affect parts of the UK on Saturday.During the morning the south will be at risk from more widespread thundery developments and locally intense rainfall.
"The focus is then expected to shift into northern England, southwest Scotland and eastern fringes of Northern Ireland during the afternoon, while parts of southern Britain see improving conditions.
"The public should be aware of the potential for localised flooding due to the intensity of the downpours although the location of the heaviest rainfall remains uncertain."
The Met Office has issued two yellow warnings of heavy rain for the east of England.
The first alert covers Essex, Southend-on-Sea, Thurrock & Hertfordshire. It is valid from 1800 on Wed 21st May to 2355 Wed 21st May.
The second alert covers Bedford, Cambridgeshire, Norfolk, Peterborough, Central Bedfordshire, Essex, Hertfordshire, Luton, Southend-on-Sea, Thurrock & Suffolk. It is valid from 0005 Thu 22nd May to 2100 Thu 22nd May
The Met Office says: "Outbreaks of heavy and locally thundery rain are expected to move northwards across southeast England later today, perhaps accompanied by gusty winds. The public should be aware of the risk of localised flooding."
The Met Office Chief Forecaster said: "As is usual in such situations there are uncertainties in the details. Whilst some spots could get 20 mm in less than an hour and over 30 mm in 2 or 3 hours, other places could well miss the worst."
It was a stormy weekend across the ITV Anglia region.Firefighters in Chelmsford were called to a house on the city's St Catherine's Road which was struck by lightning. Thankfully the strike didn't cause a fire but did leave a chimney in a precarious position.
House owner Pam North said the noise was like "ten pin bowling balls" hitting the roof
Well it had to end some time and for many of us the heatwave came to a dramatic conclusion last night as violent storms swept across some parts of the region.
There were spectacular displays of lightning and thunder, coupled with torrential downpours.
Cambridgeshire was one of the worst hit areas: homes were struck by lightning and over half an inch of rain fell in some places. And for one family, a lightning strike led to a dramatic escape.
Click above to see ITV News Anglia's Elodie Harper report in the thunderstorms
Dramatic thunder storms have been causing major disruption across the East, with fires, flooding and power cuts. Lightning strikes and heavy rain fall have been causing lengthy delays on the roads and train lines, and flights at Stansted Airport were also affected.
Emergency services have been busy dealing with house fires in Bedford, Milton Keynes, parts of Northamptonshire and Cambridgeshire