Chester weather turned wetter for people in western parts of the UK after the Met Office issued thunderstorm warnings for the coming days. The first impacts are most likely along parts of the Devon and Cornwall coasts, where heavy downpours, frequent lightning and gusts of 50–60 mph could arrive quickly.
The timing matters because the warnings followed another very hot day, and thunderstorms are most likely when warm air near the ground sits beneath much cooler air above it. As that air rises, cools and condenses, it can build the towering cloud needed for storms.
Devon and Cornwall coasts
People in Devon and Cornwall are the first to watch conditions closely. The Met Office said some of the most frequent impacts are likely along parts of those coasts initially, with storms capable of developing in a matter of hours and staying highly localised.
Manchester Weather reported Harry Paticas citing more than 40C in Hertfordshire school, a separate example of how the same hot spell has already pushed temperatures sharply higher in other parts of the UK.
Friday warnings
On Friday, further warnings are expected as the storms spread more widely across the UK. That broader reach means readers outside the first-warning areas should still keep an eye on short-term changes, because thunderstorm cells can move fast and bring sharp shifts in conditions.
The same storms can also cut the other way: the rain may offer relief after hot weather, but the Met Office says they can also bring torrential rain, strong winds and lightning. That combination raises the risk of flash flooding, travel disruption and power cuts, especially where heavy downpours arrive over a short period.
What people should do
People in areas that could be affected should think ahead before the weather turns. The Met Office advises checking whether a location could be at risk of flash flooding, securing loose outdoor items before gusty winds arrive, and moving indoors if storms develop.
If a thunderstorm starts while you are outside, the advice is to find safe, enclosed shelter such as a building or car. Avoid trees and tall structures, and if you are in an exposed or elevated area, move to lower ground as soon as possible.
