Third Heatwave Looms for the UK
The United Kingdom is bracing for a potential third heatwave, as meteorologists predict temperatures could climb to 30°C in certain regions within the coming days. This development follows what provisional Met Office data identified as England's warmest June on record, and the second warmest for the entire UK.
Weather Patterns and Forecast
A significant high-pressure system is currently developing, extending from the Azores towards the Iberian Peninsula. By the weekend, this heat is expected to spread across France and into southern Britain, potentially pushing some locations to meet heatwave criteria. While much of the UK may remain below these thresholds earlier in the week, temperatures in Greater London and the Home Counties could reach 28°C by Friday. Sunday is anticipated to see peak temperatures potentially hitting 30°C, which could mark the earliest declaration of a heatwave in some English locales.
Regional Temperature Variations
- Southern Britain: Hot air is forecast to establish itself, with daily highs approaching or exceeding 30°C. Initial westerly winds may mitigate the most extreme temperatures seen in late June, but a brief return of southerly winds later in the week could further elevate temperatures, though this remains uncertain.
- Northern Areas: Temperatures are not expected to reach heatwave levels as quickly, if at all. The high-pressure system may be positioned further south, allowing cooler Atlantic air and scattered rainfall to affect Northern Ireland, Scotland, and northern England. Cities like Belfast, Liverpool, and Glasgow are likely to experience more moderate temperatures, ranging from 20°C to 24°C.
Defining a Heatwave and Health Alerts
A heatwave in the UK is officially declared when daytime temperatures meet specific regional thresholds for three consecutive days. For instance, London and the south-east require 28°C, while northern Britain's threshold is 25°C.
In response to the anticipated conditions, the UK Health Security Agency has issued yellow heat health alerts for several regions, including the East Midlands, East of England, London, south-east, and south-west. These alerts highlight an increased health risk for vulnerable individuals due to the elevated temperatures. However, unlike the previous heatwave, the air is expected to be less humid initially, potentially making the high temperatures feel somewhat more manageable.
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