A powerful thunderstorm swept across London in the early hours of Tuesday, June 23, bringing 'biblical' levels of rain that caused flash flooding and forced the closure of Balham Tube station. Residents reported being woken by deafening thunderclaps and bright lightning strikes, with some describing the noise as an explosion.
Storm Duration and Intensity
Writer Adam Schwartz posted on X: 'It’s 3.45am in London and it’s been thunderstorming for almost two straight hours. One of the biggest and longest storms I can remember in my almost 35 years in this city.' Another resident said: 'Was woken around 3:30am by the loudest clap of thunder I’ve ever known. The lightning, rain and thunder were like something off a horror movie.'
Travel Disruption
Transport for London (TfL) confirmed that Balham Tube station is shut due to flooding. Elizabeth line trains are not running between Heathrow Terminals 2&3 and Heathrow, and Trams are suspended between Sandilands and Elmers End/Beckenham Junction. A-roads in Wallington, Twickenham, and Childs Hill are also closed due to standing water. Footage shared on X showed water pouring over platforms at Ruislip station, described as a flash flood.
Contrast with Forecast Heatwave
The storm comes as London prepares for an extreme heatwave, with temperatures expected to reach 39-40°C later this week. The Met Office has issued a rare red alert for much of southern England and Wales on Wednesday and Thursday, warning of significant health risks and transport disruption. The UK Health Security Agency (UKHSA) also issued a red health warning for six regions, including London, indicating 'a risk to life for even the healthy population'.
Met Office Warning
The Met Office had warned that 18 UK areas could see 'frequent lightning, gusty winds, torrential rain' and hail. The warning is in effect for London, the South East, South West, and East of England until 9pm Tuesday. The authority stated: 'The storms will be moving quickly reducing the potential for widespread large amounts of rain, but there is a few places could see 20-25 mm of rainfall in a short period.'
Public Response
Residents expressed shock at the sudden change. One social media user wrote: 'Massive thunderstorm in London sounded like an explosion and woke me up at 3AM. How is it raining heavily and it’s still so damn HOT.' Another warned: 'The absolute FLOODS I've just driven through in North London. If you're a nervous driver, avoid the roads this morning.'
Health Risks
Dr Agostinho Sousa, head of extreme events and health protection at the UKHSA, said: 'It is vitally important that people understand the risk posed by high temperatures like these, and take steps to keep themselves and their friends, families and neighbours safe.' The heatwave could break the June record set in 1976, with temperatures possibly reaching 38-40°C.
