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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It will be a dry and warm night with some clear spells and light winds. Lows of 15 deg C (59 deg F).
Tuesday was the hottest day of 2016 so far with temperatures in the Anglia region climbing close to 32°C.
Plentiful rain and a lack of sunshine made June 2016 one of the wettest and dullest ever in East Anglia.