A thunderstorm warning has been issued by the Met Office for much of southern England on Thursday, with the risk of torrential downpours which may cause travel disruption and, in a few places, flooding.
Thousands of people heading to Glastonbury Festival, which opened on Wednesday, could bear the brunt of the conditions – with the event close to the edge of the weather warning area..
The yellow thunderstorm warning is in place between 10am and 11.59pm.
The Met Office said there was a small chance homes and businesses could be flooded as well as the possibility of fast flowing floodwater causing danger to life.
Flooding may also cause some road closures, with heavy traffic on the roads already expected around the UK due to rail strikes.
A possible deluge will add to the problems experienced by people on the second of three days of rail strikes this week, due to take place on Thursday.
Friday is not looking too good either.
It is forecast to be “cooler overall, with widespread showers or longer spells of rain”, Sky News weather producer Chris England said.