Yesterday at 19:24 UTC the ITF unlocked because of a saturation of WE MIR actuation (fig 1). The correction was progressively increasing in the latest half an hour and it was often very close to 10 V in the latest minutes (fig 2). It was due to an increasing of ground motion between 0.5 and 1 Hz (fig 3), typically due to the weather close to the site (for instance, strong rain or particularly stormy sea). That frequency component was the main responsible of the large correction (fig 4); improving the filters at that frequency has for sure an impact at 1.8 Hz, so any change needs to be tested in terms of stability. There is also the chance that something can be improved at the level of the top stage control, but also in that case, the margin of improvement without worsening other frequency regions is small.