The Asteroid, Comet Alley, East Fork, Hyalite Canyon

In Comet Alley, about 100' below the first proper ice pitch of the Asteroid, I triggered a small dry-slab avalanche with a crown of about 6" in height and 8' wide. The slope was around a 45 degree angle. I self-arrested and was able to stay fairly close to the spot where I realized the snow was moving. Afterwards, I took shelter under an ice bulge out of all slide paths about 20' below and 15' left of this where we built an ice anchor. My partnered continued up the slope towards the ice and triggered another dry slab with a 10" crown height and about 15' wide. This slid for about 75' before it triggered a propagation to the small and steep adjacent slope directly underneath The Comet ice climb. About 100' below our ice anchor was a small cliff with a fairly flat area beneath it. After completing P1 of The Asteroid, on rappel, we kicked down another slide of about 10' in width. The upper elevations of Hyalite received 4-6" of recent snowfall in the 48 hours preceding.Temps were in negative single digits in the couloir with a very small amount of wind (approximately 5mph) while on route. Striations in the snow were visible only on the uppermost portion of the couloir where the slides were triggered. We were moving quickly up until the upper portion of couloir. I believe high excitement levels about the beauty of the alley and the long-awaited pitch of ice, after a long approach made us less cautious than we should have been all around. I did hear a whumph very low in the couloir on relatively inconsequential, stepped terrain (near the "approach slabs").

Quick report