The River Savio burst its banks in the province of Forlì-Cesena on Monday, according to the Italian Fire Service, which said it had rescued 2 people.
Roads and bridges were closed amid mud- and landslides, while trains in Rimini and Bologna were interrupted as the waters threatened to cover the tracks.
Nine other regions were on lower yellow alert, most of them on Italy’s Adriatic coast, though gale warnings were also in place in Liguria and Tuscany.
Storms battered the south and centre of Italy on Sunday, with strong wind, rain and even hail reported in several regions. In Puglia, farmers’ associations estimate that the unseasonal storms have done hundreds of thousands euros’ worth of damage to the agricultural region’s crops.