Belgium heatwave: yellow alert issued as temperatures reach 37°C
Belgium is gripped by a significant heatwave as temperatures forecast to reach 37°C prompt a yellow heat alert. Train operator SNCB has announced cancellations on Monday and Tuesday, while violent storms are expected later in the week.
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About this story
A heatwave is defined as three consecutive days with maximum temperatures at or above 25°C and at least one day above 30°C. The Royal Meteorological Institute (IRM) issues colour-coded alerts — yellow, orange, red — based on intensity and duration.
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The history
Belgium experiences periodic summer heatwaves, but temperatures approaching 37°C represent one of the more intense heat events in recent years. European heatwaves have become more frequent and severe due to climate change.
Why now
The heatwave reached official status on 21 June after three consecutive days above the threshold. Today, 22 June, sees the peak forecast of 37°C, making it the most acute day of the event.
What to watch
Whether the yellow alert is upgraded to orange; extent of SNCB cancellations and disruption on Monday; storm timing and severity later in the week.
Regional impact
The yellow alert covers the near-entirety of Belgium. SNCB is cancelling selected train services Monday and Tuesday to protect rail infrastructure from heat-related damage.
Questions readers ask
- ·Which SNCB lines are affected by cancellations?
- ·How long will the heatwave last?
- ·Is the yellow alert likely to be upgraded?
- ·When are the storms expected?
What happens next
SNCB train cancellations are expected Monday 23 and Tuesday 24 June. Violent thunderstorms are forecast later in the week as the heatwave breaks. Authorities may upgrade the alert level if temperatures exceed forecasts.
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This briefing was prepared with AI assistance and reviewed by a Belgium Impulse editor before publication. methodology.