This weekend apparently.WOW! I had a beautiful helicopter flight out of the Grand Canyon yesterday... ....to the south rim medical clinic to stitch up a large laceration on my arm. ----- 2 kids were with me (---- was hit in the elbow and has a bruised bone.........we hope that's all). ---- came up from Goodyear and brought us home. We were at Fern Glen about 10 miles upstream from Lava when it was hit with a microburst; hurricane force winds followed by intense hail and an hour of the most heavy rain I'd ever seen and then a flash flood. A commercial group camping upstream a mile at National campsite lost everything. They barely made it to the rafts with PFDs and took off. Their flash flood rose the river level by us by 4-5 feet. We camped together that night and helped each other out. Normally after an event like that you'd see waterfalls off the rim. This time it was a complete pour over along the rim bringing water, debris and rocks. Yes, lots of rocks. While running to safety, I was hit by a rock tearing a chunk out of my arm. Another lady in our group was hit by a rock that broke her clavicle in 2 places and broke the same arm in 2 places. She was med evacuated to St. George Utah for surgery. The rest of the group is still on the river hoping to cut the trip short......except that the take-out at Diamond Creek also "flashed" and it washed out so they will have to go to Pierce Ferry. Today they run lava. Wish them well. The following posted 8-12-2018 WRA was at Tuckup, GCE at National and a private at Fern Glen. The storm was next level gnarly with silver dollar size hail and literally every drainage flashing huge. National camp looked like a bomb went off there when we rowed by the next morning. Gear, tents, bags, kitchen, everywhere. It was haunting and eerie. We had our entire kitchen taken out at Tuckup but managed to recover most of it. Seeing the scene at National made of realize we got off relatively easy compared to the other two camps. I’ll be interested to hear more about how the other two groups fared. Glad that no one died and hopefully everyone can get reunited with their personal gear.