Heavy showers and thunderstorms could be on the way in Surrey this weekend, the Met Office has warned.
A yellow warning has been issued for for London and South East England for thunder and lightning between 9am and midnight on Saturday.
The worst of the weather is expected during the morning mainly over parts of England before becoming mainly focused over northern England and Scotland by late afternoon/evening.
Some intense downpours are likely and whilst rainfall accumulations will vary from place to place, as much as 50mm of rain could fall in a short space of time in some locations.
Hail, lightning and gusty winds will be additional hazards, say forecasters.
Flooding of homes and businesses could happen quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds.
Fast flowing or deep floodwater is possible, causing a 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.
Some communities might become cut off if roads flood.
Power cuts might occur and other services to some homes and businesses could be lost.