I had a few hours mid-day and 80% overcast so I thought I'd hike Geronimo Trail at South Mountain. Going up I had the 20% sunshine and must have sweated off 4-5 pounds. I saw a storm a ways out but didn't think it would reach me for awhile. I saw a few millipedes and a few of those red velvet things. By the time I got to Buena Vista Lookout the storm was hitting. I was going to get wet anyway so I headed over to Hidden Valley. WOW, I've never been up on South Mountain with the rain comming down that hard! In a matter of minutes the trail was flowing and the wash seemed to be raging a foot or more deep. I've never even seen that wash run. I could barely make it on the trail and had to detour and jump and wade in spots. It was cool to see it run through Fat Man's Pass and down Hidden Valley through the Tunnel. By the time I went through and came back around the National section had slowed to a trickle. It happen so fast and stopped fast too! When I got back to Buena Vista the Sun was out to cook me back to the car. I saw dozens of Millipedes on the way back and a couple dozen more of those red things. About a half mile before the car I got to see a TORTOISE . We talked for a minute or two and then headed are seperate ways as it was pretty hot. Another great adventure on South Mountain!!