UK weather: Final day of heatwave brings thunderstorm and flash flood risk

UK weather: Final day of heatwave brings thunderstorm and flash flood risk

The UK is experiencing the final day of its ongoing heatwave, which has brought high temperatures across southern and eastern regions. On Monday, places such as Pershore in Worcestershire and Cavendish in Suffolk recorded three consecutive days above the heatwave temperature threshold. This trend is set to continue into Tuesday, with more areas in the south and east expected to meet heatwave conditions. Amber and yellow heat health alerts remain in place across much of England until Wednesday morning, forecasted to see temperatures soaring above 30°C in some locations.

Despite the persistent warm weather, the intense heat is not expected to last much longer. By midweek, a shift in weather patterns will bring a cold front moving south across the Midlands and extending into southeastern England. This front, however, is unlikely to produce significant rainfall. Some southeastern areas—including London, Essex, Kent, and Surrey—may see no rain at all as the UK continues to face conditions reminiscent of the driest and sunniest July on record. The presence of low-pressure systems to the north has resulted in below-average rainfall across much of the country, with southern regions seeing little relief.

Although low pressure has brought rain to Scotland, Northern Ireland, and northern England, scattered showers and thunderstorms are expected to develop on Tuesday and into Wednesday in these areas. A yellow thunderstorm warning has been issued for parts of Northern Ireland, effective from noon to 9 PM, with the potential for up to 30mm of rain falling within a couple of hours. Strong winds and hail are also possible during this period. The dry, hardened ground resulting from the prolonged drought means that heavy bursts of rain could lead to flash flooding, as water struggles to soak into the parched soil. Hail, which typically forms from towering cumulonimbus clouds fueled by intense ground heat, may accompany the heaviest showers.

Looking ahead, forecasts for August suggest that the prolonged spell of dry and hot weather is set to continue. Model projections indicate low rainfall combined with above-average temperatures across much of the UK. Consequently, ongoing hosepipe bans affecting over 20 million people in England and Wales are unlikely to be lifted in the near future. Wisley in Surrey remains the driest part of the UK, having gone 47 days without measurable rain. While further heat spikes may occur, the diminishing strength of the sun as summer progresses will likely reduce the chance of extreme temperatures in the high 30s. Nevertheless, it is still common to experience temperatures of 30°C or higher well into September

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