Wow - I am in awe of what wind can do at a relatively slow 200mph. Nothing can survive the overpressure - even if designed for it. Buildings simply explode as their internal pressure cannot come down quickly enough to the the extremely low pressures of the swirling wind on the outside of the structure. The walls and roofs cannot take the pressure differential in excess of 20 pounds per square inch (if the twister is actually producing a vacuum and is negative bar). At sea level and 70 degrees F, the ambient air pressure is 14.7psi. I do not have specific data, but a twister should produce a vacuum at its center, making the pressure differential better than a 20 psi total drop. In those circumstances, a building simply will explode. You cannot plan for it, nor design for it. All you can do is get underground.
I will try and accumulate all the references to the might wind which will sweep the earth near the end. It will be on the order of 400-500mph - which will make the damage of a tornado look like child's play. The only thing that will prepare people for that is being underground under 6-12" of re-inforced concrete. This is very serious stuff. Any food storage not also stored under these conditions will likewise disappear. Under these conditions, sidewalks and pavement begin to lift and buckle as the boundary layer between the airflow over top and the hard surface of the earth produce intense vacuum. Similar to the effect at the surface of the skin of a jetliner at cruise. If its not bolted down, its going for a ride in the turbulent air above it.
Mother Mary Shipton described this kind of wind in her prophetic writings. It appears to be the same wind which scoured the tundra in the days of the woolly mamoth when they were tossed into ravines and flash frozen almost instantly by some mysterious event (probably a portion of this planet leaving and pulling the atmosphere in that region up with it; my best guess.....).
Your best solution for this? Its what I am hoping to do - 3500 gallon cistern with drive-over lid on it, buried 18" under the earth's surface. I will describe that in more detail later.
I believe when winds of those speeds hit the earth, its from the jet stream coming down to the ground. Now why it would do that, I do not know. But there certainly must be some kind of upheaval within the atmosphere and possibly the currents & water temperatures of the oceans to cause such a disruption.
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