I remember that - we had just left about a week before. Mid summer can be ugly in the Southern Siera with the unpredictable monsoon effect.
Outside of a hurricane, and a few monster t-storms we'll see in the south during spring/summer, I've never witnessed skies as angry as what I saw around the Portal last mid-July. I remember Doug telling us to absolutely, positively go no further than Outpost Camp if they didn't clear. How right he was.