Set off two wet slides skiing down North Sister at ~2pm via the standard south route. First slide was remotely triggered from about 40' above, had a crown width of ~100', and slid for ~500' before stopping on slightly more mellow terrain. Second slide broke at ski tips while traversing skiers right towards exposed rocky ridge - crown width of ~150' and total slide length of ~800'. It appears that the staunch wall for both slides was ~100' below the crown. Below this both were more wet loose in nature, and took several minutes to slow to a stop. No skiers were caught in either slide.
Weather: Saturday and Sunday were hot and sunny. Temperatures were below freezing overnight.
Snow conditions: Both slides presumably occurred on the interface between the old snowpack and the several inches of fresh snow forecasted for the 27th-28th. Isolated whumphing/collapse was observed the previous day between 8000' and 9000'. Small rollerballs were observed on steeper aspects but did not gain in size.