A yellow thunderstorm warning has been issued by the Met Office for Southampton along with much of the country.
The warning is in place for tomorrow (Sunday) from 4am to 9pm.
The Met Office said: "A small chance of flooding and disruption from heavy showers and thunderstorms on Sunday in a few places."
What should we expect?
Spray and sudden flooding could lead to difficult driving conditions and some road closures.
Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services.
There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost.
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.
More detail from the Met Office
A few showers and isolated thunderstorms are expected to develop across parts of southern England on Saturday night, but by Sunday morning there is an increasing risk of more active and organised heavy showers and thunderstorms moving in to, or developing across, parts of southern England.
The risk of storms will then steadily transfer broadly northwards through the afternoon and into the early evening.
The extent of these thunderstorms is very uncertain, and many places will miss them, but where they do occur, 30 to 40 mm of rain may fall in less than an hour with perhaps over 75 mm in one or two places, leading to a chance of flooding and disruption.
Frequent lightning strikes and hail will be additional hazards, most likely across southern and central England.
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