Charles Knight's Hail Cannon

Origin
Hail Cannons were built to be fired into the air as a shock wave to disrupt to formation of hail in the air thus preventing hail storms from ever occurring. However, there wasn't any proof that it works one hundred percent, likewise when trying to prove it doesn't work. Charles Knife was a cloud physicist whose funding was going to be cut unless he proved his hail cannon worked. His frustration, worry and anger was transferred into his own hail cannon however instead of preventing storms, it created it.

Effects
Does the reverse of what it was designed to do, fires a shockwave into the sky increasing the production of hail in the skies creating hail stones that range from golf balls to a small car if fired multiple times into the clouds.