The weather forecast speaks of rainfall of over 50 mm per square metre in the period between Friday afternoon and Sunday afternoon.
The lion's share of the rainfall is expected in Flanders (archive photo).
The risk of flooding is greatest starting Saturday morning. The VMM says that the areas along small waterways where the ground is already saturated as a result of the rainfall of recent days are most in danger.
"We believe that at the moment the threat of flooding is greatest in the basins of the River Dender, the River Zenne and the Upper Scheldt River and especially in the Pajottenland District, South West of Brussels, and in the Flemish Ardennes in East Flanders."