# Dense fog can disrupt traffic in northern Netherlands until tomorrow

> The KNMI has issued a code yellow warning for dense fog, which it says can be very local and treacherous and can disrupt traffic.

News · published 2026-10-30 05:33 · updated 2026-10-30 07:19 · https://nlnow.nl/a/dense-fog-brings-code-yellow-warning-to-northern-netherlands/

The KNMI, the Royal Netherlands Meteorological Institute, warns of dense fog in the northern half of the Netherlands under a code yellow alert. It says the fog can be "very local and treacherous".

Visibility in dense fog is less than 200 metres, and the fog can disrupt traffic. The KNMI says it can persist until Friday morning. Fog can also form elsewhere, it says.

Where visibility is under 200 metres, drivers may switch on their front fog lights. Rear fog lights may only be used when visibility is under 50 metres. Visibility is expected to improve gradually in the second half of Friday morning.

## Background

- **KNMI (Koninklijk Nederlands Meteorologisch Instituut)**: The Royal Netherlands Meteorological Institute is the national weather service of the Netherlands. It monitors and forecasts the weather, climate and seismic activity, and maintains the country's weather stations. It issues the official weather warnings, such as code yellow, orange or red, that alert the public and emergency services to conditions like fog, storms, heavy rain or ice.

From NLnow, news from the Netherlands in English. How stories are made: https://nlnow.nl/about/