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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Parts of the Anglia region have seen nearly a month's worth of rain in just a few hours during intense thunderstorms overnight.
A wet and windy start, with heavy and perhaps thundery rain in places. This will gradually ease away westwards through the morning.