Snow hunting is snowfall with little visibility
Snow especially causes problems when it blows hard, and when it freezes. With a wind force of 6 or higher, with snowfall and sight of less than 200 meters one speaks about a snow hunt. The drifting snow that arises leads to major nuisances in people's homes (cracks and holes are prone to snow) but especially in traffic there is a lot of trouble. The sight is poor, there are roads unreachable by accumulations of snow (snow dunes). In situations like this, the KNMI gives additional warnings and alarms again.
Source and more information on the website of the KNMI.