Flash flooding has hit the South due to heavy storms, which began last night.
The Thames Valley has been particularly affected, with large hailstones also being seen in Reading.
Transport links across the region have been disrupted by the weather.
Flooding at Woking station means all South West train services are affected, with fewer trains able to run. Disruption is expected until the end of the day.
There has also been flooding at Newbury Station, meaning some Great Western Railway services will be unable to reach the station and trains are delayed by up to thirty minutes.
Lightning has damaged the signalling system between Ascot and Guildford, affecting South West train services between the stations, with problems expected to last all day.
A number of roads in the region have already been closed or partially closed due to flooding.
The M4 Westbound at J8 near Maidenhead has had two lanes closed and there have also been closures on the A25 near Guildford.
Drivers are being urged to stay safe on the roads this morning,