The storm that hit central Europe — which unleashed several months’ worth of rain in just a few days — was spawned by a rare combination of meteorological factors.

At least 17 people have been killed in some of the worst floods to hit central Europe in decades as Storm Boris sweeps through the region, dumping well over a month’s worth of rain.

Heavy rains caused severe flooding in Central Europe, affecting countries like Austria, the Czech Republic, Poland, and Romania.