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What is the easiest way to unlock the achievement Tornado Valley (Survive a tornado outbreak with no human causalities)? I always seem to have multiple buildings destroyed along with numerous citizen deaths.

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up vote 5 down vote accepted

Upgrading the weather station will warn your citizens and get them to shelter.

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Confirmed. I was able to get the "Head for High Ground" achievement by adding the tsunami detection upgrade as well. – Shaun Sep 23 '11 at 0:54

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