Yellow Warning of Rain for East of England covering Essex, Hertfordshire, Suffolk, Norfolk & Cambridgeshire between 9pm and 11:45pm tonight.
The Met Office weather warning for the predicted weekend thunderstorms has been upgraded from yellow to amber for most of England and Wales on Saturday.
Thunderstorms have already hit some parts of the Anglia region through Friday morning but more downpours are expected over the weekend.
Heatwave conditions are expected across the region today with temperatures forecast to rise to 32°C (90°F)
"Several areas of heavy, thundery showers will develop over England and Wales from Friday night before moving northwards during Saturday. Not everywhere within the warning area will see thunderstorms, and indeed some spells of warm sunshine are expected at times, but where thunderstorms do form, some torrential downpours are likely with frequent lightning, large hail and locally strong gusts. Significant flooding is possible where these do occur from surface water as well as from small, fast-responding watercourses."
Torrential downpours are affecting parts of the Anglia region as hot air arrives from the continent.
The white areas on the rainfall radar indicated rain rates in excess of 32mm per hour.
Heatwave conditions are expected in the area today with temperatures up to 32°C.
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People affected by December's tidal surge across parts of Norfolk are being asked to share their experiences to help update a community emergency plan.
Anyone affected in the areas around Great Yarmouth are being asked to take part in an online public survey called "Make it Happen".
The results will help the Borough Council improve its flooding responses.
There's a warning by Public Health England this morning of heatwave conditions across the East of England for the next few days.
The high temperature alert's been issued as forecasters predict at least two days of very high temperatures.
People are being advised to stay out of the sun during the hottest part of the day.
Writtle near Chelmsford recorded the highest temperature in the UK on Wednesday 16 July with a maximum of 27.9°C (82.2°F).
It is forecast to get much hotter on Thursday and Friday and the Met Office has issued a heat-health alert.
Other highs in the Anglia region on Wednesday 16 July
- 27.3°C in Cavendish, Suffolk
- 26.7°C in Santon Downham, Suffolk
- 26.5°C at Andrewsfield near Braintree, Essex
- 26.2°C in Wattisham, Suffolk
- 26.1°C in Weybourne, Norfolk
- 25.7°C in Cromer, Norfolk
Wattisham in Suffolk was the wettest place in Britain on Saturday night with 31 mm (1.2 inches) of rain falling between 10pm and 10am on Sunday morning.
That amounts to more than the fortnight's worth of rain in just 12 hours.
More scattered heavy showers are forecast for the rest of Sunday and the Met Office has issued a further yellow weather warning for more heavy rain.
With temperatures expected to rise during the coming week, it's possible it could hit 30°C for the first time this year in East Anglia.
Currently the highest temperature of the year in the Anglia region is 28.7°C recorded at both Writtle, Essex and Weybourne, Norfolk on 4 July.
The Met Office has issued a yellow weather warning for further heavy rain in Cambridgeshire, Essex, Norfolk, Suffolk and Lincolnshire.
The warning is in force from noon on Sunday 13 July until 7pm
The Met Office says: "Heavy showers and isolated thunderstorms are likely to develop across some eastern parts of England during Sunday afternoon.
"The public should be aware that localised downpours could lead to temporary surface water flooding, such impacts perhaps most likely where heavy thundery showers have occurred during the previous 24 hours."
The Chief Forecaster's assessment: "Rain will clear from the east this morning, but as the cloud thins and breaks to allow some sunshine, so heavy showers and isolated thunderstorms are likely to develop for the afternoon.
"Some of the showers may be slow-moving with the potential for a few places to see around 20 mm of rain within an hour. Showers should die out more rapidly this evening than on Saturday evening."
The Met Office have just issued the following severe weather warning for heavy rain.
Yellow Warning of Rain for East of England : Cambridgeshire, Essex, Norfolk, Peterborough, Southend-on-Sea, Suffolk & Thurrock valid between 1200 and 7pm.