Severe Storms Trigger Mudslides and Lightning Strikes Across Flanders
A powerful storm system swept through West Flanders, Belgium, on the night of June 19-20, unleashing torrential rain, over 26,000 lightning strikes, and a destructive mudslide that inundated homes in the Westhoek region. The severe weather, which arrived as Belgium endured its first heatwave of 2026, caused widespread damage across multiple provinces and exposed critical failures in the country’s emergency alert system.
The Storm’s Fury
The storm reached the Belgian-French border near Wervik on Friday evening, rapidly intensifying as it moved across Oost- and West-Vlaanderen. According to the VRT NWS liveblog, the Royal Meteorological Institute (KMI) recorded 26,000 lightning strikes across Belgium, with more than 12,000 in Flanders alone.
In the village of Westouter (Heuvelland), heavy rainfall triggered a mudslide around midnight that flowed into multiple homes. Resident Lena Vanpeteghem described waking up to find water flooding her home: “I woke up startled and immediately stood with my feet in the water, I’m not well from it.” Neighbor Lander added: “It was all hands on deck, but we couldn’t stop that sudden, heavy rainfall. It went very fast.” Sandbags placed at doorways were overwhelmed by the force of the mud.
Lightning strikes were reported in Handzame (Kortemark), where a residential home suffered damage to lighting and switches, and in Oudegem (Dendermonde), where a lightning strike ignited a roof fire. The family evacuated safely in both cases. Het Laatste Nieuws reported that in Ledegem, a farm belonging to provincial council member Piet Vandermersch was struck by lightning, causing a fire that left the home uninhabitable.
Widespread Damage and Emergency Response
Emergency services were stretched thin across the affected regions. Brandweerzone Fluvia, covering South-West Flanders, responded to approximately 170 interventions on Friday evening and 92 more overnight, deploying 139 personnel with 35 vehicles at peak activity. Brandweerzone Vlaamse Ardennen handled roughly 140 calls, while Brandweerzone Westhoek managed around 20 interventions.
In Waregem, streets flooded up to knee height, with water seeping through café ceilings. Focus-WTV reported that a possible whirlwind caused damage in the Zwevegem-Anzegem region, with roofs torn off buildings and debris scattered across roads. In Sint-Baafs-Vijve, 42 millimeters of rain fell in just one hour — more than half the monthly average.
The storm also claimed cultural heritage: the historic Huisekoutermolen in Kruisem, a protected windmill dating back centuries and safeguarded since 1944, was completely destroyed by the wind.
Broader European Impact
The severe weather was not confined to Belgium. In the Netherlands, a 25-year-old woman was killed when a tree fell on her car in ‘t Haantje, Coevorden. Hailstones up to 2 centimeters in diameter were reported, and a wedding venue near Twente was flooded, with 150 guests evacuated safely. In Germany, nine people were injured by a lightning strike at a sports festival in Rastatt, Baden-Württemberg, and a tent camp with 300 children was evacuated in Moormerland.
MeteoVista noted that hailstones reaching 4 centimeters in diameter were recorded in Dadizele, causing damage to vehicles.
BE-Alert System Failure
A significant concern to emerge from the storm was the failure of Belgium’s BE-Alert emergency warning system. Warning emails sent on Friday afternoon arrived hours late — or not at all — for many recipients. The VRT NWS reported that over one million identical emails were sent simultaneously, causing email providers to flag them as spam or phishing. Some recipients did not receive the warnings until the following morning — 14 hours after they were sent.
Yves Stevens, spokesperson for the National Crisis Centre, acknowledged the problem, explaining that email providers are legally required to perform additional checks when large volumes of identical messages are detected. He emphasized that SMS messages and voice calls remain more reliable channels for urgent warnings.
Heatwave Context and Outlook
The storms were fueled by a heat dome over Western Europe, with temperatures reaching a new daily record of 33.4°C in Ukkel on June 19 — the warmest June day since 2011. VRT NWS weather presenter Jacotte Brokken explained: “We are under a heat dome. That will bring temperatures above 30 degrees next week, even up to 35 degrees.” The volatile combination of extreme heat and atmospheric instability created conditions for severe “heat thunderstorms” (hitteonweders).
Code yellow for thunderstorms remained in effect for the evening of June 20, and the heatwave is expected to continue with temperatures forecast to reach 35°C in the coming week. The NMBS has already announced the cancellation of some P-trains on June 22-23 as a precaution against heat-related equipment failures.
What’s Next
As affected communities begin damage assessments and cleanup operations, questions remain about the total cost of the destruction and whether the BE-Alert system will be reformed to prevent future delays. The destruction of the Huisekoutermolen has also raised concerns about the vulnerability of cultural heritage sites to extreme weather events — a challenge that is likely to grow as climate change increases the frequency and intensity of such storms across Western Europe.