2023-06-21 08:05:00
This Wednesday, the MRI alert on the quantities of water which will fall from this Thursday, June 22 on Belgium. And it is Wallonia that will be the most affected. On Tuesday, the regions of Comines and Tournai have already been strongly affected, as has the region of Mons-Borinage. But Thursday, it is the whole of Wallonia which is concerned: “Very abundant precipitation over a period of around 24 hours (probably less) is expected in the eastern or south-eastern half of the country”, indicates the IRM .
On the East of Hainaut, it is necessary to expect precipitations which will pour between 30 and 70 mm of rain.
For the provinces of Liège, Namur and Luxembourg, the MRI announces 30 to 80 mm (very locally, a scenario gives values of 100 to 115 mm). “The differences are explained by the forecast of thunderstorms in the heart of the active rain zone.
The equivalent of a month of rain
Very large quantities that the MRI also contextualizes: “For information: we usually observe accumulations of the order of 70 mm in one month (100 mm in the Hautes-Fagnes).”
The provinces of Liège, Namur and Luxembourg go into code orange from 8 a.m. this Thursday.
“If the most pessimistic forecasts are confirmed, we might switch to code orange in other provinces (even from orange to red if >100 mm).”
Mudslides
On the SPW side, the operational general management of Mobility and Waterways indicates that “these intense rainfall leads to a risk of erosion and sometimes significant mudslides from cultivated fields as well as a saturation of the drainage network , or even an overflow of small streams.”
Possible overflow of watercourses
The SPW does not rule out “exceeding the pre-warning threshold for overflow flooding on larger rivers”.
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