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 stay cold this afternoon with an increased risk of sleet and snow showers, especially in the north and west.
The Met Office has issued at yellow "be aware" warning for snow and ice in the Anglia region for Thursday evening into Friday.
A warning has been issued for Norfolk and Suffolk for the risk of snow on Sunday and Monday. Wintry showers are possible in all areas