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 forecasters are using just one word to sum up the next few days: cold.
It will be dry and sunny for most over the next few days - but that won't help the temperatures.
A dry night with clear skies will leave to frost and fog patches overnight.