A amber thunderstorm warning covers regions across England and Wales starting at 6am on Friday, July 17. Intense gusts of 30 to 40 mph are likely, with some sizeable hail possible. The main hail risk focuses on East Midlands and London corridors during early and evening travel times. The alert lasts throughout the day until evening but heavy rain could still lead to limited floods in places where drains become overwhelmed in vulnerable zones.