By Beefing up the coastline (just funning around), I meantbuildings have to be designed to withstand much higher wind forces
They have done that on the coast. It is older construction that gets blown away.
The performance of lightweight construction is severely impacted and the external fabric punctured when your trees or car ends up in your living room.
What do you mean by "all our buildings". On the coast, all houses, commercial buildings or the whole country anything thing that's built. Because here there is a wide range. From no codes in some areas way out in the country to very strict in others.
There have been several studies of areas hit hard by tornadoes and recommendations made, books written, guidelines published, but the codes have not changed much that would make recommendations mandatory. All comes down to cost. People that can afford too spend more can have a safer home.
You're right, can't beat concrete. That's where I feel safe. I have had 2 pass over my house that weren't quite on the ground.(before we had a safe room) Worst sound ever, like your laying under a train. http://www.strongtie.com/ftp/catalogs/c-hw09/C-HW09-p25.pdfhttp://www.strongtie.com/ftp/catalogs/c-hw09/C-HW09-p12.pdfhttp://www.strongtie.com/ftp/catalogs/c-hw09/C-HW09-p38-p39.pdf
Do you guys get many tornadoes?
F1 Weak: 73-112 mph winds: Roofs damaged, mobile homes moved off foundations, trees snapped, moving autos pushed off roads.
F2 Strong:113-157 mph winds: Roofs removed from frame houses, large trees snapped or uprooted, mobile homes destroyed, boxcars overturned.
F3 Strong:158-206 mph winds: Walls removed from well-constructed houses, cars overturned, most trees leveled.
F4 Violent: 207-260 mph winds: Well-constructed houses destroyed, cars thrown.
F5 Violent: 261-318 mph winds: Well-constructed houses lifted up and disintegrated, automobile-sized structures thrown over 100 meters, steel-reinforced concrete badly damaged.