It can be quite foggy in some places this morning. That is why the KNMI Code has issued yellow for Drenthe, Friesland, Noord-Holland and Groningen.
There is a close fog in these areas, which means that the view can be less than 200 meters. The traffic can suffer from that, according to the weather institute.
The dense fog disappears in the course of the morning, in Drenthe the weather warning applies until 9 am.