A wave of violent rainstorms has battered parts of northern Italy, flooding the financial hub Milan and raising fears for the life of a man who was swept away on a tractor in the Piedmont region. Footage by national broadcaster RAI showed the wheel of the vehicle still visible inside the Orco creek, near Turin, where the tractor overturned in muddy water. Local rescuers said they were searching for the missing 58-year-old man. Another river overflowed in Piedmont’s Val di Susa, collapsing two bridges, blocking a provincial road and isolating about 50 people in two villages. Two other northern …