The thing about it was the rate at which it fell. I've experienced a 1" sleet storm before, but it took place over the course of many hours, not 30 or so minutes. It was just gushing kind of like a severe hail storm but with ice pellets.
EDIT: DVN snow total 9.1". Sleet is incorporated into the snow total so I'm guessing a decent amount of that is sleet.