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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A mostly dry and bright day for many but cloud will increase from the west ahead of more rain.
After a mostly dry start with some sunny spells, but thickening cloud and scattered showers will spread from the west later.
March in the Anglia region has been much drier and sunnier than normal although temperatures have been around average.