The Front Range of the Rockies gets more hail than any other place in the world. The plains of eastern Colorado and Wyoming make a sudden change to the 14,000 foot mountain with very few foothills. This creates tremendous updrafts when the clouds come east over the mountains and encounter the heat coming up from the plains. In about 1992 Denver had a storm which left hail up to 30 inches deep on the ground. We had a heck of a thunderstorm with hail yesterday. I took a few shots (of course). This is the corner of my office parking lot. The splashes are from hailstones. More street/rivers. That's hail on the ground and street. Patiently waiting for the waters to subside. I got dog food in the shopping center in the background and came easily through this same intersection less than 10 minutes later. The water had subsided to 8-10 inches. This is about 5 minutes after the last picture. storms gone!