I have other stuff to do, but I can’t continue after seeing this video of baseball-sized hail in St. Louis.
Crazy stuff. Did you see the car in the driveway across the street? It no longer has a rear window.
Why is this large hail not very good? In short, larger hail has a greater mass and larger hail has a greater terminal velocity. Let me assume that hail of different sizes has the same density as ice (which might not actually be true) – about 917 kg/m3. How fast would this hail fall? Well, let’s think about failing hail. There would essentially just be two forces on this hail, the gravitational force and an air resistance force. The gravitational force is constant, but the air resistance force increases as the speed of the hail increases. At some point, these two forces will have the same magnitude and the hail will stop increasing in speed. This is called terminal velocity.
Here is a diagram of the forces on a piece of hail (or would it just be called “a hail”) with radius r at terminal velocity: