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They are not unknown. My MILs house has several. The thick plexiglass is harder to break than glass as it bends and gives some. No doubt a softball size hunk of very hard ice smashing into the ground at terminal velocity of 110 MPH can smash through a roof.
To keep a baseball size hunk of ice suspended in the air at up to 30,000 feet takes 200 to 300 MPH updrafts.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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