The Met Office has extended the yellow warning for heavy rain and thunderstorms across the whole of East Anglia.
Its warning of the risk of localised flash flooding and hail along with potential for disruption to travel and power supplies.
The weather warning is valid until 9pm on Wednesday 20 July 2016
The Met Office says areas of heavy thunderstorms will continue to affect parts of Scotland and northern England into this afternoon before slowly clearing away northeast.
However isolated heavy thunderstorms may still develop across Scotland and parts of England, including some central, eastern and southeastern areas, this afternoon and this evening.
The Met Office said: "Whilst most places will miss the worst, please be aware of the risk of localised flash flooding. Frequent lightning, large hail and strong winds could be additional hazards. All of this could lead to some flooding of homes, businesses and transport networks. Disruption to power is also possible."
"Hot, moist air spreading north and northeast across the UK today will produce thunderstorms, initially organised within large areas of rain before becoming more isolated this afternoon.
"Rainfall will be very variable, but some places could see around 30 mm in an hour and more than 50 mm in a few hours.
"The thunderstorms later this afternoon are likely to be most widespread across northern England and Scotland, and it is here that there is the greatest risk of disruption.
"Further south, they will be much more isolated, with disruption less likely, across the rest of England."
Tuesday was the hottest day of 2016 so far with temperatures in the Anglia region climbing close to 32°C.Read the full story ›
A huge inflatable water slide has been set up in Norwich city centre as part of the Lord Mayor’s Celebration events.
Hundreds of spectators lined the streets to see people having a go on 100-metre three lane SlideRider.
The slide was there to raise money for Cancer Research UK. It was also the perfect way to cool down in the heat!
Norwich was the hottest place in the UK at midday on Saturday 4th July 2015 with a temperature of 28.6°C (83.5°F) recorded at the city's international airport.
Many places in the Anglia region had their hottest July day on record on Wednesday when the thermometer touched 35.3°C (95.5°F) at Wittering in Cambridgeshire.
With every good heatwave in the British summer there is nearly always a spectacular thunderstorm or two.
The early hours of Saturday 4 July saw widespread electrical storms across East Anglia.
At Hitchin in Hertfordshire there was 35 mm of rain, which is more than normally falls in two weeks in July.
The overnight deluge make it the wettest day of the year so far in the East of England.
Rainfall totals in the Anglia region in the 12 hours to 10am on Saturday
- 21.4 mm in Bedford
- 21.2 mm in Woburn, Bedfordshire
- 17.6 mm in Monks Wood near Sawtry, Cambridgeshire
- 15.0 mm in Harpenden, Hertfordshire
- 13.6 mm in Holbeach, Lincolnshire
- 11.8 mm in Wattisham, Suffolk
- 8.0 mm in Writtle, Essex
- 7.2 mm in Cambridge
- 3.8 mm in Norwich
Fine and dry throughout the day with some good long sunny spells, feeling hot in the afternoon sun. Highs of 29 deg C (84 deg F).Read the full story ›
After what's been the hottest day in the region for almost 10 years there are warnings tonight about the dangers of swimming in open water.Read the full story ›
There are fresh warnings today of the dangers of open water swimming after a man died at a Suffolk Reservoir last night.
The body of a man, believed to be in his 20s, was pulled from Alton water Reservoir in Tattingstone, near the Dedham Vale, after a major search by emergency services.
They were called at around 8pm last night after reports that the man was seen going under the water.
"We are asking people to stay safe following a tragic incident at Alton Water near Ipswich last night.
The best way to stay safe in or near the water is to take some sensible precautions and prevent accidents from happening."
The start of July could see the hottest day in East Anglia for nine years if temperatures rise above 33.4°C.Read the full story ›
With temperatures rising and expected to top 30 degrees here are some top tips from experts on how to stay safe in the sunRead the full story ›