This failure mechanism is always remarkable, but is unfortunately quite common, and doesn& #39;t usually require very high wind speeds (relatively speaking) to occur. It happens when the weakest link in the structural load path is at the foundation and is a terrible life safety risk. https://twitter.com/WXMolly/status/1249665540441997313">https://twitter.com/WXMolly/s...

Similar to many mobile/manufactured homes, these homes rely completely upon the weight of the home to resist uplift forces and sliding forces. The stronger the uplift, the lower the sliding resistance becomes (remember static friction force from physics?).

The concerning part is that when the anchorage is the first element to fail, the house is much more susceptible to complete collapse. In many pre-1950s homes, like this one it appears, the diagonal planks they use instead of sheathing provide stiffer walls and a heavier house

that are less prone to complete collapse or being lofted like lighter mobile/manufactured homes are. But the failure mechanism in both is very similar. Mobile/manufactured homes are a higher life safety risk in part because of how much lighter they are. #engineering

Homes like this one that moved typically sit on unreinforced (i.e., not filled with grout or steel rebar) masonry block stem walls or brick masonry piers. The wood floor joists rests on the walls with maybe a few concrete nails into the block or similar if anything at all.

Thanks to @AlanGeog here& #39;s the precise location and distance traveled by the home. Property records indicate it was built in 1952. Pre-tornado view included from same source. Usually these homes are just resting on the brick masonry, relying on gravity. https://beacon.schneidercorp.com/Application.aspx?AppID=562&LayerID=8423&PageTypeID=4&PageID=4081&KeyValue=068%20%20%20%20010">https://beacon.schneidercorp.com/Applicati...