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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Cloudy and damp ahead of Storm Doris
The region has enjoyed its warmest day of the year and the hottest February day for five years.
The region is seeing its warmest February day in five years, with temperatures set to climb to 10 degrees higher than expected for February