UK amber heat warning extended as thunderstorms hit after record heat

The UK’s record June heat has given way to thunderstorms, after the Met Office extended an amber extreme heat warning and disruption spread across transport, schools and emergency services.

Temperatures reached 37.3C in Santon Downham, Suffolk, during the hottest part of the spell, capping a run of warnings that had already included rare red alerts for parts of England and Wales earlier in the week. The latest phase of the weather did not end the risk so much as shift it, from heat-health pressure to storm-related disruption.

The amber warning was reported as having been extended into Sunday morning for parts of eastern and southeastern England. That extension came as the weather turned more unsettled, with thunderstorms, lightning and heavy rain adding a new layer of disruption after several days of extreme heat.

From record heat to storms

The heatwave built through the week before peaking on June 27. Forecasts had already warned that record-breaking temperatures were possible, alongside high humidity and warm nights that would make the conditions more dangerous for vulnerable people.

The UK Health Security Agency issued heat-health alerts during the spell, including amber and red alerts across affected English regions. The warnings reflected the public-health risk posed by the heat, particularly for older people and others more exposed to extreme temperatures.

By June 27, the focus had shifted from heat alone to thunderstorms. Reporting described a fast-moving change in conditions, with storm activity following the hottest part of the spell rather than replacing it cleanly.

Airport disruption

Air travel was among the biggest immediate casualties. The Guardian reported that thunderstorms disrupted Heathrow, Gatwick and other airports, with more than 600 flights delayed or cancelled.

The disruption added to a wider travel problem already caused by the unsettled weather. Safety and regulatory restrictions were cited in the reporting, underscoring how quickly the storm conditions affected operations at major UK airports.

Separate coverage said the broader scale of disruption was even higher when all affected services were counted, though totals varied by outlet. The clearest confirmed point is that the thunderstorms caused major knock-on delays and cancellations across the London airport network and beyond.

Local impacts and emergency response

The storms also brought local damage. Lightning-triggered house fires were reported in East Sussex, adding to the emergency response burden as services were already dealing with the heatwave aftermath.

Schools were reported closed in some areas during the heat and storm period. Hospitals and emergency services were also said to be under strain, with reporting describing critical incidents at some hospitals during the wider weather event.

That combination made the story more than a simple forecast update. It became a public-safety and infrastructure problem, with transport, education and health services all affected at the same time.

Why the warning matters

The Met Office warning reflected the way the weather hazard evolved. The hottest part of the spell created direct health risks, while the thunderstorms introduced a different set of threats: lightning, local flooding, fire risk and travel disruption.

Forecasters had already treated the heatwave as unusual for the time of year, with warnings expanded before the peak and then upgraded to rare red alerts for parts of England and Wales. The later amber extension showed that the risk had not passed just because the temperature was easing.

For older people and other vulnerable groups, the health concern remained significant even as conditions cooled slightly. Warm nights, high humidity and the lagging effects of prolonged heat can all keep pressure on health services after the daytime peak has passed.

What happens next

The main immediate questions are whether the Met Office extends or downgrades the amber warning again, and how quickly the storm disruption clears.

Airport operators and airlines will also be watching whether delays continue into the next day. The scale of final disruption may change as more flight data is reported and as airports work through the backlog.

Authorities are still monitoring for any further storm damage, including flooding, fires or injuries. Local authorities and schools may also issue additional closures or safety advice if conditions worsen again.

For now, the story remains live because the weather shift is still being measured and the operational impact is still unfolding. The confirmed picture is one of record June heat turning into thunderstorms, with the result felt across transport, health and public services.