In Buenos Aires province...heavy flooding killed at least 57 people...with at least 20 people still missing.
Most of the dead...at least 51...were in the provincial capital of La Plata...where 12 inches/400 mm of rain fell in a few hours on Wednesday.
In La Plata...at least 100,000 households were destroyed by floods.
3 days of national mourning were declared.
Experts describe it as the heaviest rain in a century.
3rd UPDATE READ :