Heatwave brings cold-water shock warnings after fatal open-water incidents
A 35C heatwave sent people to rivers and coasts, but rescuers warned water stayed cold enough to trigger shock, panic and drowning.
Hot air drew people toward rivers, lakes and beaches, but the water stayed cold enough to turn a swim into a medical emergency. The Royal National Lifeboat Institution said anything below 15C counts as cold water, and warned that even when the air feels warm, the sea, rivers and lakes can still trigger cold water shock, an involuntary gasp, faster breathing, panic and a sudden loss of swimming ability.
That danger mattered as the Met Office forecast temperatures as high as 35C in parts of England during the bank holiday heatwave. The agency warned that cold water shock can strike when someone is unexpectedly immersed in water below 15C, and said the initial effects typically last around 90 seconds. The National Weather Service has made the same point: warm air does not mean warm water, and cold shock can sharply alter breathing, heart rate and blood pressure.
The RNLI said the average sea temperature around the UK and Ireland is only about 12C, and that rivers such as the Thames can be even colder in summer. It warned that the first gasp can be enough to inhale water, while breathing may speed up as much as tenfold. Even strong swimmers can lose control in the first moments after entering cold water.
The warnings came after a string of fatal incidents in open water. The Telegraph reported that police were called to six fatal open-water cases involving five teenagers and one man in his 60s. One of the victims was named as 13-year-old Reco Puttock, who died after getting into difficulty at Leadbeater Dam near Halifax.
The National Fire Chiefs Council and the RNLI issued separate water-safety appeals telling children and teenagers not to enter unsupervised open water, to use lifeguarded beaches where possible, and to follow Float to Live advice if they get into trouble. The NFCC said its Be Water Aware campaign supports the UK Drowning Prevention Strategy, which aims to cut accidental drownings by 50% between 2016 and 2026.
The message from safety officials was blunt: a hot day can hide a cold-water hazard. As temperatures climbed, rescuers urged people heading to the coast or inland waters to treat every untested stretch of water as dangerous, because the air may feel like summer while the water still behaves like winter.
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