Thanks for the info all. I'd like to take the conversation back to my original somewhat poorly stated question. I know I'll be ok with my hammock on the Rae lakes loop, but am wondering if my two ground sleeping friends should bother bringing a tent to the sierras in summer. My preference is for them to just take a poncho/tarp and some rope and make a shelter in the event of a storm. Is this good advice for them? How likely is it that a very cold storm could blow in in August and leave then in a dangerous situation because they only have basic shelter?