Code yellow warning for fog across Belgium all day

Code yellow warning for fog across Belgium all day
Illustration picture shows a foggy morning on the roads in and around Brussels. Credit: Belga / Siska Gremmelprez

Wednesday is another grey, foggy day across Belgium. In most parts of the country, a code yellow weather warning for fog will remain in place all day.

The foggy conditions from Tuesday have continued into Wednesday, which will be a grey day with drizzle in some areas. The Royal Meteorological Institute (RMI) has therefore issued another code yellow for all of Belgium, including Brussels.

"Today, fog is limiting visibility to less than 200 metres in many places," the RMI noted. The code yellow was issued from 05:00 to 13:00 in West Flanders, East Flanders and Antwerp. In Brussels, Limburg, Flemish Brabant, Walloon Brabant, Liège, Namur, Luxembourg and Hainaut, it will remain in place until 01:00 on Thursday.

What is the difference between fog, mist and haze?

Fog, mist and haze all affect visibility, but the term differs depending on how far you can see through them.

    • Fog is when you can see less than 1,000 metres (1 kilometre) away. However, in forecasts for the public, this generally refers to visibility less than 180 metres.
    • Mist is when you can see more than 1,000 metres and up to 8 kilometres when looking out to the horizon. It is quicker to dissipate and can rapidly disappear with slight winds.
    • Haze is a slightly different phenomenon. It is a suspension of extremely small, dry particles in the air, not water droplets like fog or mist.

Temperatures will range between 2°C in the Ardennes and 9°C in the west. "On Wednesday night, it will remain cloudy and foggy with possible drizzle," the RMI noted.

In the Ardennes and Belgian Lorraine, Thursday will be cloudy with local fog banks, but soon the sun will break through and it will be sunny. Clearings will later develop in other places in the centre and north of the country. Temperatures will range between 0°C and 6°C at the coast.

The RMI again warned people that there is a heightened risk of carbon monoxide (CO) poisoning. Caution is needed when using water heaters and fireplaces to heat premises as poor airflow makes removing CO from living spaces more challenging. When inhaled, CO can cause headaches, nausea and dizziness, and in severe cases, death.

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