<Table> <Tr> <Th> FU </Th> <Th> F0 </Th> <Th> F1 </Th> <Th> F2 </Th> <Th> F3 </Th> <Th> F4 </Th> <Th> F5 </Th> </Tr> <Tr> <Td> 0 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 0 </Td> <Td> </Td> <Td> 0 </Td> </Tr> </Table> <Tr> <Th> FU </Th> <Th> F0 </Th> <Th> F1 </Th> <Th> F2 </Th> <Th> F3 </Th> <Th> F4 </Th> <Th> F5 </Th> </Tr> <Tr> <Td> 0 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> 0 </Td> <Td> </Td> <Td> 0 </Td> </Tr> <P> A destructive early - morning F4 tornado moved through rural areas in the Brazilian state of Rio Grande do Sul on a path of at least 18 kilometers, causing two deaths and leaving more than a thousand damaged or destroyed homes . Another tornado (F0) formed in Chiapetta, causing no damage . Some of the worst damage along the path of the tornado occurred in the Ciríaco area . Multiple homes sustained loss of roofs and walls, and a few were leveled . Vehicles were tossed from roads into fields, large metal storage silos were toppled to the ground, and thousands of chickens were killed at farms . Countless trees and power poles were snapped along the path as well . </P>

What is the strongest tornado to strike in the u. s. so far in 2018