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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Warm with an increasing chance of heavy showers.
The UK has seen its hottest day in April for nearly 70 years and temperatures in the Anglia region peaked at 28°C in the Anglia region.
Weather conditions will be mainly dry, very warm and often sunny. Isolated showers may break out during the afternoon.