At least 10 people were killed early Tuesday by a twister that tore through San Pedro, a town in the northeastern Argentine province of Misiones.

“It was something never seen here before,” San Pedro mayor Orlando Wolfart told Buenos Aires radio stations, adding that several homes had been knocked from their foundations. “The forest is gone, houses, the Santa Rosa neighborhood had a health center inaugurated three years ago, and it's gone,”

The front later struck the southern Brazilian state of Santa Catarine, where four people died when high winds knocked over 90 houses.

Officials there said at least another 64 people were injured, 40 of whom were taken to hospital.

In Paraguay, severe storms brought large hail that damaged hundreds of homes as well as large tracts of crops.

The front eventually swept across the nearly tropical city of Sao Paulo, Brazil’s financial capital, darkening the midday sun and causing flash floods.

When the front passed the Uruguayan capital of Asuncion, temperatures plunged from 95 degrees Fahrenheit to 54 degrees — more than a 40 degree drop.

Satellite Loop: Earthbrowser