We can engineer bunkers and safe houses though, right?

There's a question of whether or not its worth it, especially the maintenance costs. But if tornadoes in the region only give 15 minutes of warning, then a very strong "safehouse" of some kind is probably the best option.

Maybe the group would get trapped in the safehouse and be nearly starving after 2 or 3 days. But the rescuers might find them in time?

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I'm not necessarily saying that its easy to build a 110-person bunker. But if you have 110 workers, then surely that's something you need to consider as a preventative / safety measure?