Thunderstorms have started to break out over eastern parts of Norfolk, Suffolk and Essex.
The Met Office has a yellow weather alert in force warning of torrential thundery downpours in places with the risk of surface water flooding. There's also the possibility of hail and strong gusts of wind.
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The cloud will thicken and lower again overnight but temperatures will stay mild. Chance of some bright spells developing tomorrow.
Provisional figures from the Met Office suggest this autumn will end up as the third mildest on record for both the UK and the Anglia region