Severe weather forecast for Sunday August 31 for eastern UK

The Met Office has issued an early warning for heavy showers and thunderstorms for eastern England and Scotland on Sunday 31 August, which could add to an already tricky harvest for arable farmers..
The warning says parts of eastern UK will see very heavy downpours during the afternoon and evening of Sunday.
Friday [29 August] and Saturday [30 August] are both forecast to be warm and dry with some sunshine in most areas apart from the very far north-west, the Met Office suggests.