The Met Office has issued a yellow weather warning for the risk of torrential downpours and thunderstorms in the Anglia region overnight Sunday into Bank Holiday Monday.
Although many areas will miss the heaviest rain, the Met Office says where the downpours occur there could be some disruption, with sudden flooding of roads, transport routes, homes and businesses possible locally.
The forecaster is also warning that frequent lightning in association with the heaviest rain may also temporarily disrupt power supplies.
Heavy showers overnight. Fine for most of Sunday.
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.