The Met Office issued this warning today.
The warning period is from 12:00 noon until 7 pm on Friday 9 September.
Showers will develop fairly widely again by this afternoon, some being heavy with scattered thunderstorms.
A few of these may become slow-moving or aligned over one particular place, more likely over the East Midlands and Eastern England. 15-20 mm of rain within an hour in places; one or two spots might see 30-50 mm in around 3 hours, where successive, or slow-moving, showers occur. Frequent lightning is also possible in a few places, along with hail.