The UK is bracing for its fourth heatwave of the year, with temperatures forecast to reach 35C by Wednesday, prompting heat health alerts and an urgent appeal from fire chiefs for caution in parched parks and rural areas.
Record-Breaking July Heat
According to provisional Met Office data, July has been 3C above average across the UK. With more than a month of summer remaining, the UK has already experienced more days above 30C than ever before. Southern England has received just 1% of its average July rainfall, while England as a whole has had 5% and the UK 20%.
Short-Lived but Intense
Forecasters predict this heatwave will be short-lived. Temperatures are expected to rise from Tuesday, reaching 30C as a high-pressure system sits across the east and south-east, peaking on Wednesday. The Met Office said temperatures will gradually cool from Thursday, except in the south-east where another hot day could keep the region in official heatwave conditions.
Health Service Impact
The UK Health Security Agency issued amber heat health alerts for the east and south-east of England, beginning Wednesday at 9am and ending Thursday. Yellow alerts remain in place for Yorkshire and the Humber, West Midlands, and south-west regions. Ambulance and emergency medical teams anticipate a surge in patients suffering dehydration, heat exhaustion, heatstroke, and exacerbated heart and respiratory illnesses.
Helen Vine, assistant director of the Association of Ambulance Chief Executives (AACE), said: "Recent episodes of extreme heat have shown how quickly patients can become seriously unwell. With amber heat health alerts in place, we would urge people to take the risks seriously by staying hydrated, avoiding strenuous activity during the hottest parts of the day, limiting alcohol consumption and seeking advice from NHS 111 for non-emergency health concerns."
Wildfire Risk
With wildfires across Europe displacing hundreds of thousands in France and Spain, UK fire chiefs are preparing for increased wildfire risk. Residents of Nethy Bridge in Scotland were evacuated at the weekend after a large fire in the Cairngorms national park. During the third heatwave in mid-July, firefighters battled 19 significant wildfires simultaneously in England and Wales.
A spokesperson for the National Fire Chiefs Council urged the public to avoid disposable barbecues in parks and countryside, and to take care with cigarette butts. "It only takes one spark to start a wildfire, and what may appear to be a small fire can quickly escalate, threatening communities, wildlife, natural habitats and the firefighters tackling the incident."
Climate Context
Human-caused climate breakdown is making every heatwave more intense and more likely. The sustained temperature increase may lead to a redefinition of heatwave criteria. Met Office meteorologist Marco Petagna noted that thresholds for some counties were raised by a degree four or five years ago. "Going forward they'll need to be adjusted to take into account current climate, otherwise we're going to more frequently go into heatwaves. It's a moveable thing, really, as we go through a warming world."
