Rescue efforts in Brazil have been postponed due to increased rains, lightning, and flooding.
At least 100 people have been killed so far by the flooding, and over 163,000 have been displaced.
Floods that began last week due to extremely severe rainfall have wrecked highways and bridges in the Brazilian state of Rio Grande do Sul, which borders Uruguay and Argentina.
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"We've lost everything," said Adriana Freitas in the state capital, Porto Alegre, where the Guaiba River burst its banks and inundated city streets.
"It's sad when we see the city, our house, in the middle of the water. It seems like it's over, that the world has ended."
At least 128 people are still missing, according to the state's civil defense administration, which has urged anyone living near the Patos lagoon south of Porto Alegre to evacuate immediately.
Army personnel used amphibious armored vehicles to rescue residents from floods at Canoas, just north of the city. The waters had reached a depth of three meters (10 feet), and the streets could only be accessed by boat.
A Reuters correspondent witnessed a team of local volunteer rescuers uncover about 20 canines stuck on the second story of an abandoned factory, offering food to those too aggressive to carry onboard.
On Wednesday afternoon, Porto Alegre city hall urged citizen rescuers to suspend their activities due to the prediction of rain, lightning storms, and gusts topping 80 km/h (50 mph).
In the Porto Alegre suburb of Eldorado do Sul, tractor driver Daniel Farias said he'd spent days ferrying people to safety.
Brazil's national centre for natural disasters said that the southern region of Rio Grande do Sul state had "high risk" of more floods, with rains anticipated to resume after a brief respite.
According to the administration, storms and floods in neighboring Uruguay disrupted roadways, displacing almost 800 people and leaving more than 3,000 without electricity.
