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I don't know how you came to the conclusion that you are not in tornado alley...
Having said that, the risk of getting blown away in a tornado is fairly low.
It seems you are wondering about a couple different things in your original post.
If you are increasing the number of connections from your garage sill plates to the slab, you can quit now. If a tornado of sufficient strength hits your garage, you will have successfully kept your sill plates attached to the slab but everything else will be in Kansas. Not much point in that. The weak point is the connection of the individual studs to the sill plate.
If you want a good shelter, install an underground shelter. If you have already purchased an above-ground shelter, that can be anchored to the ground successfully and reinforced, if needed.
JR
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