which areas were the worst affected?
Passo de Torres
Hurricane Catarina
At Passo de Torres, many shipyards were destroyed, as they were not designed to withstand the pressure differentials caused by Catarina's winds; widespread roof damage was reported at this municipality as well. Near the Mampituba River, a house was blown about upstream, literally landing in another state: it originally was built in the Torres municipality of Rio Grande do Sul, yet it ended up in Passo de Torres, within Santa Catarina. In rural areas, the corn, banana, and rice fields received the most damage, although rice farmers were able to partially recoup their losses, as they had harvested before Catarina made landfall.

Overall, almost 36,000 residences were damaged as a result of Catarina's onslaught; of those, 993 collapsed completely. The commercial sector fared slightly better, as only 2,274 buildings were damaged and 472 collapsed. Finally, 397 public buildings were damaged and three were destroyed. These account for 26% of the total buildings in the region, which amounted 
where was hurricane catarina formed? South Atlantic Ocean did it make landfall? Yes - Between the cities of Passo de Torres and Balneário Gaivota, Santa Catarina in South Brazil when? March 28, 2004 how severe was the hurricane? Category 2 hurricane-force sustained winds
wiki:7170301
Hurricane Catarina [SEP] Impact
Like normal tropical cyclones, Catarina brought heavy flooding with it. Despite the uncertainty in the future of the storm, Brazilian officials took the appropriate actions to ensure the safety of the residents who lived along the coastline. A successful evacuation was executed for numerous residents along the coast, though some people decided to ride out the storm in their own homes. The storm damaged around 40,000 homes and destroyed 1,500; 40% of the rice crop were also lost. Total damages were estimated at $350 million (2004 USD). It also killed at least three and injured at least 75. At least 2,000 people were left homeless following the storm.