The Met Office has extended Thunderstorm weather warnings until next Monday.
The area has been warned to expect the extreme weather for six days.
Areas of showers and thunderstorms associated with a hot and humid air mass stranded across the southern half of the UK are expected to continue through the week until at least Monday.
As storms arrive they will bring heavy rain, hail, thunder and lightning which could cause some flooding in areas, as up to 50mm could fall in 3 hours.
Power cuts and damage to buildings could also be a problem where lightning strikes occur.
The Met Office say: “Areas of showers and thunderstorms associated with a hot and humid air mass stranded across the southern half of the UK are expected to continue through Friday, and not solely during daylight hours.
“Many areas encompassed by this warning will miss the thunderstorms altogether, but where they occur, heavy rain (20-30mm in an hour, and possibly as much as 50mm in 2 to 3 hours), frequent lightning, and in some places large hail are all potential hazards.
“The greatest chance of impactful showers is expected to be in the southern half of this warning area, where afternoon showers are more likely to be slow moving and prolonged
“Areas of heavy showers and thunderstorms are expected to develop on Sunday, with some persisting into the late evening.
“A similar day on Monday, though the thunderstorms more likely to clear earlier in the evening. Many areas within the warning area will miss the thunderstorms altogether, but where they occur , the heavy rain (15-25mm) is expected in an hour, and as much as 40mm in 2 or 3 hours. Thunderstorms are likely to be accompanied by hail , lightning and gusty winds.”