A yellow thunderstorm warning covers parts across England and Wales starting at 6am on Friday, July 17. Strong gusts of 30 to 40 mph are forecast, with some large hail possible. The main hail risk centres on the East Midlands and London routes during early and evening travel times. The alert lasts from dawn to dusk until evening but heavy rain could still cause minor floods in places where drains overflow in low‑lying areas.