Have come across this footage from Dolores, Soriano, Uruguay (~ 150km north of Buenos Aires) from 6 December 2012.
Tornado, Dolores, Soriano, Uruguay clip 1 (very cool multiple vortices at ~ 40 secs on)
Tornado, Dolores, Uruguay, clip 2 (very strong low level circulation, close to ground meso and incredible clean classic supercell structure)
Interestingly, there's also footage of a funnel cloud / possible tornado from Buenos Aires so there may have been an outbreak:
Funnel cloud Buenos Aires 6/12/12
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