This link was posted on the stormtrack forum of a multivortex tornado is Brazil 24/05/05. Worth having a look at. Rare footage of a southern hemisphere tornado with its 'clockwise' rotation.
http://www.lemma.ufpr.br/ernani/indaiatuba.html
Tornado video
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These topics are a read-only archive and may be subject to out-of-date information.
For today's weather discussion head to: New Zealand Weather & Climate