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the advice I've heard is to get in the bathtub
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That makes sense. Much more than protection from falling beams.
The extreme low pressure (vacuum) in the center doesn't lift anything. It's the higher pressure air rushing into the void that pushes objects up into the funnel. The pressure differential that creates lift on an airplane wing is another example.
So being in a bathtub would protect you from that multi hundred mph horizontal wind (with debris) pushing you too.
Of course the whole tub may fly but it's a sensible option.