The Met Office has issued yellow weather warnings for parts of the UK, including east Wales, the Midlands, northern England, East Anglia, and southern England, due to forecast heavy rain and thunderstorms on Wednesday and Thursday. Up to 40-50mm of rain is possible in two to three hours in the hardest hit locations, with flash flooding a risk in areas where the ground is dry and hard. The storms may bring lightning, large hail, and gusty winds, with some areas potentially seeing over 75mm of rain within 12 hours on Thursday. The Met Office notes that thunderstorms are difficult to predict due to their quick development and sensitivity to small changes in temperature and atmospheric conditions.
Written by the local model on 2026-08-25,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
Story summary
Heavy rain and thunderstorms are forecasted to break out over parts of the UK on Wednesday and Thursday. The Met Office has issued yellow weather warnings for areas including east Wales, the Midlands, northern England, East Anglia, and southern England, which includes London. This is expected to be one of the most widespread outbreaks of heavy rain across southern and central parts of the UK this summer. While some areas may benefit from the rain due to drought conditions, other regions may experience flash flooding if the downpours cause too much water to accumulate on already dry ground. In addition to heavy rain, the storms are likely to bring lightning, large hail, and gusty winds.
Written for “UK Weather Warning System” on 2026-08-31,
grounded in this article and the 0 other(s) covering the same event.
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- Published
Yellow weather warnings have been issued by the Met Office as heavy rain and thunderstorms are forecast to break out over parts of the UK later this week.
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rain → publish → UK
The warnings span Wednesday and Thursday and include parts of east Wales, the Midlands, northern England, East Anglia and southern England - including London.
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warnings → span → London
While good news for regions plagued by drought, significant accumulations could lead to flash flooding where the ground is too dry and hard to absorb the downpours.
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ground → plague → downpours
Thunderstorms to fire up on Wednesday morning
The storms, which will drift out of France and move northwards, will be sparked as warm and humid air sets in from the south.
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air → fire → south
Initially, a few showers are likely to reach Cornwall and the West Country during Tuesday evening, but heavier downpours bringing thunder and lightning are likely to hit later in the night.
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downpours → reach → night
The first band of heavy showers may reach the southeast coast of England around midnight, and then cross Greater London before moving northwards into the home counties and East Anglia.
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band → reach → counties
The first yellow weather warning is set to come into force at 03:00 BST on Wednesday and last until 22:00 BST.
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warning → set → BST
Though not all locations in the warning area will experience thunderstorms, flooding is possible in those that do, with 20-30mm of rain possible in less than an hour.
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mm → experience → hour
The hardest hit locations could see up to 40-50mm in two to three hours.
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locations → hit → hours
Flash flooding is possible in areas where the ground is dry and very hard, making it difficult for rainfall to be absorbed.
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rainfall → make → areas
The most intense downpours could also bring large hail with gusty winds.
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downpours → bring → winds
During the morning on Wednesday, the storms may spread further north into the Midlands and the Peak District but the forecast becomes less certain in terms of location and intensity.
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forecast → spread → location
Thunderstorm and flood threat continues on Thursday
The storms and downpours which will have brought flash flooding and hail are forecast to continue into Thursday.
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which → continue → Thursday
A second weather warning for thunderstorms will come into force at 06:00 BST and last until 22:00 BST.
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warning → come → BST
Some may become slow moving across the Midlands, Wales and Northern England leading to more flash flooding.
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Some → become → flooding
Many areas could see 20-30mm of rain in just three hours, with up to 50mm possible in some places.
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mm → see → places
According to the Met Office, there is also a small chance of considerably higher totals, particularly over east-facing higher ground, where more than 75mm could fall within 12 hours.
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mm → accord → hours
Lightning may be frequent and hail of around 1-2cm could fall.
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hail → fall → cm
Why are rain and thunderstorms difficult to forecast?
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rain → forecast → ?
Thunderstorms are notoriously difficult to predict because they can develop very quickly and on a relatively small scale.
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they → predict → scale
Tiny differences in temperature, humidity, wind and atmospheric instability can determine whether a storm forms at all or where it moves.
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it → determine → temperature
Forecast models can often identify the risk of thunderstorms across a wider area, but pinpointing precisely where and when an individual storm will strike is very hard.
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storm → identify → area
Even a few kilometres can make the difference between a torrential downpour with thunder and lightning, and somewhere staying completely dry.
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kilometres → make → thunder
