Headline: Heavy showers and thunderstorms will affect parts of Southern Britain on Saturday - particularly during Saturday evening.
What To Expect: There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds.
There is a small chance of fast flowing or deep floodwater causing danger to life.
Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services.
Spray and sudden flooding could lead to difficult driving conditions and some road closures.
There is a small chance that some communities become cut off by flooded roads, there is a slight chance that power cuts could occur and other services to some homes and businesses could be lost.
Very warm and humid conditions will lead to thunderstorms developing across parts of Southern England, the South and West Midlands and Wales on Saturday.
Whilst many will miss the worst of the heavy rain the thunderstorms that develop will produce torrential rain and hail therefore some places could see up to 30 mm falling in an hour.
The warning has been updated to just cover Saturday with a new warning for Sunday and into Monday morning also in force.