Our house shook violently, similar to a sonic boom but much bigger. My father and I ran outside to see what had happened. He said, “Get in the car.” Driving eastward we could see a black plume of smoke rising from the refinery where dad worked, and then saw the demolished remains of a large petroleum storage tank. Several men had been welding inside and on top of the tank, but it had not been adequately tested for flammable fumes. The mixture of fuel and air was sufficient to