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Warning of scattered thunderstorms in the Anglia region

A thunderstorm earlier in July in Peterborough. Credit: Carl Rumble

The Met Office has issued a yellow weather warning for the the risk of scattered thunderstorms and heavy downpours in the Anglia region on Tuesday night into Wednesday.

The warning is in force in the south of the Anglia region from 5pm on Tuesday 18 July extending to the whole Anglia region from midnight.

It will remain in force until 8pm on Wednesday 20 July 2017

The Met Office says thundery showers are expected to push north across southern parts of the UK through Tuesday evening, perhaps turning more widespread towards midnight.

Forecasters say that although many places won't see these showers, there is a chance of localised flooding of homes, businesses and susceptible roads.

Frequent lightning may be an additional hazard with potential disruption to power networks. Similarly, but very locally, hail may cause impacts.

The area covered by a yellow weather warning from 5pm until 1155pm on Tuesday. Credit: Met Office

"Southwest England looks like it will be first to see scattered thunderstorms, the threat then expanding northeastwards through the course of the evening.

"There is relatively low confidence in the areas more at risk of intense downpours.

"Some places will miss them altogether but where they do occur, there is the potential for locally 20 to 30 mm of rain within an hour.

"This may result in surface water flooding, particularly should these amounts fall across urban areas."

– Met Office Chief Forecaster's assessment

The animation shows the rain forecast from 9pm on Tuesday until 3pm on Wednesday

The area covered by a yellow weather warning from 0005am until 8pm on Wednesday 19 July 2017. Credit: Met Office

The text of the Met Office weather warning for Wednesday 19 July 2017:

"Scattered thunderstorms with locally intense downpours will continue to move north across England and Wales in the early hours of Wednesday morning.

"Although the thunderstorms may tend to ease from the south later in the night, further, possibly severe storms may break out again on Wednesday afternoon.

"These appear more likely across central and eastern parts of England.

"Although many places will miss the thunderstorms, there is a chance of some localised flooding of homes, businesses and roads.

"Frequent lightning may be an additional hazard with potential for disruption to power networks. Large hail may be an additional hazard on Wednesday afternoon."

Up to 30mm of rain could fall in an hour in some parts of the region. Credit: Joanne Joyce

"Although many places are likely to miss the worst of the rain, intense downpours associated with the thunderstorms may give over 30 mm in an hour very locally and perhaps 50 mm in 2 or 3 hours.

"As is usual in this type of situation there is considerable uncertainty in the areas that are most likely to be affected."

– Met Office Chief Forecaster's assessment