My partner and I rode 4 laps on a lower angled slope with no activity. We then moved to the adjacent slope where it steepens a few degrees. After 5 or 6 turns I triggered the slide. I noticed the movement and rode off to the side. The storm slab moved very slowly. With the addition of some cross loading from the previous days NW winds, the new snow was bonding poorly to the solar crust. Drew's forecast was spot on today. Thankfully this was in non consequential terrain with no one caught or carried. Heuristic trap: terrain familiarity.