A more severe warning for thunderstorms and “torrential rain” which could cause a “danger to life” has been issued.
The Met Office has issued a further amber warning for thunderstorms for tomorrow, July 19, between 4am and 11am.
The alert covers both East and West Sussex.
It states that torrential rain, with thunderstorms, could lead to some “significant surface water flooding” during Saturday morning.
A yellow weather warning for thunderstorms is already in place for this evening, July 18, from 9pm until 11.59pm.
The Met Office said communities could become cut off by flooding, while railway and bus delays, difficult driving conditions, power cuts and flooding are likely.
It also warned that “fast flowing or deep floodwater is likely, causing danger to life”.
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The warning reads: “Areas of heavy rain with embedded thunderstorms will move northwards during the early hours of Saturday, with torrential downpours in places.
“Accumulations of 20-40 mm are possible in one hour, and where heavy downpours persist then as much as 70-100 mm could accumulate in just a few hours.
“Significant impacts are possible if this occurs over more urban areas.”
People are advised to avoid travelling, prepare a flood kit and consider checking in on vulnerable people.
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