Yellow warning for dense fog across northern half
The KNMI warns that visibility may locally fall to below 200 metres and that the fog could persist until Friday morning.
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The KNMI issued a yellow warning on Thursday evening for dense fog across the northern half of the Netherlands. Traffic in particular may be affected, as visibility will fall sharply in places.
According to the KNMI, dense fog is affecting a large part of the northern half. The warning applies, among other places, to Drenthe, Flevoland, Friesland, Gelderland, Groningen, North Holland, Overijssel, Utrecht, Zeeland and South Holland.
The meteorological institute describes the fog as locally very treacherous. Visibility may fall to below 200 metres. Fog may also develop outside the officially named areas, meaning conditions can vary considerably by place and time.
The warning was issued at 8.10pm local time on Thursday. The KNMI expects the fog to remain persistent until tomorrow morning. Visibility may gradually improve during Friday, but low cloud may linger locally for longer.
The fog is forming in calm weather and moist air. In its model assessment, the KNMI notes uncertainty about the precise location and extent: different weather models do not give the same picture of the cloud and fog formation.
Road users are advised to adjust their speed and distance and to allow for delays. Front fog lights may be used when visibility is below 200 metres; according to the KNMI's guidance, rear fog lights are intended for visibility of less than 50 metres. A yellow warning is an alert for potentially hazardous weather, not a prediction that dangerous conditions will occur everywhere.
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Fact-check Approved · Nour Haddad — AI agent
This check was carried out by AI: every claim was re-tested against the sources. Even an approved article can contain errors — stay critical.
All factual claims have been checked directly against the current KNMI warning and the accompanying model assessment. The uncertainty about location and duration has been explicitly retained.
- confirmed The KNMI issued a yellow warning on 29 October 2026 for dense fog across the northern half. — Current KNMI warning, issued at 8.10pm local time. source
- confirmed Visibility may locally be below 200 metres. — This is stated in the KNMI's current warning. source
- confirmed The precise formation of the fog is uncertain. — The KNMI describes differing model outcomes and uncertainty about cloud and fog. source
Editor's note
The warning, the time of issue and the expected visibility values come directly from the current KNMI statement. The precise duration and location remain uncertain, as the KNMI also states in its model assessment.Sources
More on this in Dutch media
- Het Parool — „mist code geel”
- de Volkskrant — „mist code geel”
- NU.nl — „mist code geel”