Avalanche: Chugach State Park

From Nate Ray: Observed via binoculars from my house in ER valley a large slab avalanche on North Bowl from my house today. I did not see trigger, but prior to this I watched multiple skiers ski this face, and approximately 20 minutes later it had avalanched. I observed at least 6 skiers out. Given how large this avalanche was (appeared to be ~200ft and ran on the ground) I contacted AST. If you or your party saw this or was involved please contact AST as they are planning on launching SAR tomorrow AM.

UPDATE: Chugach State Park was able to account for all vehicles shortly after dark. No SAR was initiated. A party of two in the area late in the day saw the avalanche (shortly after release) and skinned as quickly as possible to the debris and did a beacon search. No signal was found. Thank you to the this group and the CSP ranger for determining there was no involvement.

Big thanks to Chris Flowers and Sarah Heck for the photos and the quick response, and to Nate Ray for sounding the alarm.

Additional information from Gus Jespersen:
Just a quick update on the details of the N. Bowl avalanche. Our party witnessed it from the ridge ~300m east.

The trigger was a solo skier entering from the typical N. Bowl spot. It was a fairly slow moving slide. The skier went skier's left onto lower angle terrain and successfully exited the debris before it picked up much steam. Broke at the ground, similar aspect as the Harp avalanche across the valley. Several other skiers had reported excellent skiing conditions in the bowl just prior, and the skier who triggered was maybe skier number 15-20 for the exact same line. We did not report earlier as we assumed the skier would self report. Sorry to hear there was confusion and CSP was called out.

Cold and clear, teens, little to no wind. Snow surface was a mixed bag of soft snow and wind slabs. Only sign of instability was a natural release on Harp Mountain on the same aspect.