Heavy Rains In Brazil's South Kill At Least 8 People, Leave 21 Missing: Authorities

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An additional 11 people were injured and more than 1,400 were forced to leave their homes due to damage caused by the storms, the civil defense added.

Operators reported electricity and water cuts across the state, and officials detailed numerous incidents of flooded roads, landslides and collapsed bridges as water levels of rivers and streams rose sharply.

Authorities activated the Brazilian Air Force to assist stranded people. It deployed two helicopters for the rescue mission.

The downpour started on Monday and was expected to last through Friday, civil defense authorities said.

In some areas, such as valleys, mountain slopes and cities, more than 150 millimeters (6 inches) of rain fell in 24 hours, said Brazil's National Institute of Meteorology, known by the Portuguese acronym INMET, on Tuesday.

Weather across South America is affected by the climate phenomenon El Ni?o, a periodic naturally occurring event that warms surface waters in the Equatorial Pacific region.

In Brazil, El Ni?o has historically caused droughts in the north and intense rainfall in the south.

This year, the impacts of El Ni?o have been particularly dramatic, with a historic drought in the Amazon. Scientists say extreme weather is happening more frequently due to human-caused climate change.