I had wondered how the trip went, thanks for checking back in! And sorry about the weather and the rather abrupt end to the trip, that sounds pretty character building. For what it's worth, you were at the tail end of the statistically driest time of year (last week of July to first week of August), but last summer was unusual with the amount of T-storms and precip that we had, esp. in August.
If you look at Cliff Mass's Blog he has some interesting posts from the time of your trip: http://cliffmass.blogspot.com/2014/08/heat-wave-thunderstorms-and-cool-down.html
Last summer started a period of unusual weather that lasted well into this spring. Things are more "normal" now, but we'll see for how long.
Hopefully you guys can get back up here and have a rain and issue free trip!