Weather tracker: torrential rainstorms cause death and destruction in Brazil

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Torrential rainstorms in Brazil's southernmost state of Rio Grande do Sul have caused the worst flooding the country has seen in 80 years, many deaths and the displacement of thousands of families. Central parts of the state were hit the hardest after the storms began last Monday, with unofficial weather stations in the area recording 50-100cm (20-40in) of rain over the past week.

Widespread floods and landslides have caused major damage to homes and infrastructure, most alarmingly triggering the partial collapse of a small hydroelectric dam on Thursday, which sent a 2-metre-high wave through the surrounding area. At least 57 deaths have been reported and 24,000 people have been displaced, alongside an estimated 500,000 being without power and clean water.

This part of South America is no stranger to major rainfall; Rio Grande do Sul has experienced flooding three other times in the past year. This is because the polar and tropical regions of the atmosphere meet around this latitude, resulting in a zone of high pressure that delivers long periods of dry weather punctuated with heavy bursts of rain. However, this event has been particularly devastating, with experts attributing the heightened rainfall to the combination of global heating and the recent El Niño phenomenon, during which waters in the eastern Pacific Ocean become warmer.