Date of Observation: 03/01/2023
Name: Zach Guy

Zone: Southeast Mountains
Route Description: Southeast mountains, viewed from Highway 135 and Mt. CB

Observed avalanche activity: Yes
Avalanches: A large avalanche on Whetstone Octogon was reportedly skier triggered on 3/1. The avalanche looks like it gouged to near the ground on a slope that is very shallow. Plus a few more naturals from the storm. See photos and details.

Date of Observation: 03/02/2023
Name: Zach Guy

Zone: Southeast Mountains
Route Description: West Elk Air flight covering most of the forecast zone. This ob highlights activity in the Southeast Mountains.

Observed avalanche activity: Yes
Avalanches: The Tuesday/Wednesday storm produced numerous wind slab avalanches, D1.5 to D2, see photos. Most of these appeared to run on Tuesday as well as a handful on Wednesday. The last pulse of the storm on Wednesday also produced many small loose avalanches and a handful of thin storm slabs involving just Wednesday’s storm snow. I spotted two fresh persistent slab avalanches that failed on old weak layers, one was a wind slab that stepped down a few feet on an east facing, windloaded ATL slope near Coffee Pot Pass, in the Southeast Mountains. The other was on a steep, shallow east facing slope near treeline on East Beckwith in the Northwest Mountains. That slope has slab avalanched at least twice this year, so it has an unusually shallow snowpack.
Weather: Clear skies, no wind drifting this morning except on White Rock Mtn.

Date of Observation: 03/02/2023
Name: billy barr

Zone: Southeast Mountains
Route Description: Gothic

Weather: Wednesday had an obscured cloud cover all day with very light but steady snow, then snow after dark before clearing after midnight and turning colder. New snow was 4″ with 0.30″ of water and the snowpack is at 69½”. The high temperature was 23F and it dropped to the current -8. The wind was thankfully light and currently it is calm. This is the first visibility in a while but i have not checked for slide activity yet.

Date of Observation: 03/01/2023

Zone: Northwest Mountains
Route Description: Irwin Area

Observed avalanche activity: Yes
Avalanches: E aspects reactive to AE 4F+ slabs failing on a small grained FC layer from the 2/26
interface. Knocked out some of the hang fire from Pre E and jumped with all our might on the rest but only
got it to inch down but wouldn’t budge.
Premature Evacuation SS-AE-R1-D1.5-I FC (70cm x 23m x 54m)
NC Shooter SS-AE-R1-D1-I FC (40cm x 15m x 53m)
Hollywood & Vine SS-AB-R1-D1-I FC (30cm x 15m x 50m)s

Snowpack: W aspects BTL lacked any slab in the recent storm snow. The 2″ from last night was
reactive and picked up enough speed to run full track on terrain >37 deg. 30-70 cm thick cross loads on EBM .
Buried MFC on Sunny shoulder seem to be breaking down and getting weaker.

Date of Observation: 03/01/2023
Name: Zach Guy Evan Ross

Zone: Southeast Mountains
Route Description: Mt Emmons. 9,000-11,400ft. NW-N-E

Observed avalanche activity: No
Avalanches: Poor visibility, but nothing we could see.

Weather: Light snow with about 2″ of new by 2pm. Calm winds.

Snowpack: No avalanche problems were encountered while skiing steep slopes. Minimal sluffing in the low-density snow that was accumulating today. Wind loading patterns from yesterday were not recognizable with the more recent snow that has accumulated since the winds died off. This week’s total storm accumulations have settled to around 20 to 30cm.

We dug a test profile on a 34-degree, east-facing slope at 10,700ft. HS was around 265. ECTN within the storm snow. Modified deep tap ect produced N results on both the valentines and late January interfaces.

Date of Observation: 03/01/2023
Name: Eric Murrow

Zone: Southeast Mountains
Route Description: Friends Hut update via InReach message.
Weather: HST 11″/.9″ , 14″/1.2″ since 2/26. Efficient winds A/NTL yesterday but quiet around hut last night. Light snowfall started early this AM

Date of Observation: 03/01/2023
Name: billy barr

Zone: Southeast Mountains
Route Description: Gothic townsite

Observed avalanche activity: No
Weather: Snow Tuesday ran until mid afternoon and then held off until after midnight with 24 hour total of 5″ new and water content 0.44″. Only light but dense snow in the past few hours. The wind stayed strong yesterday but has stopped and there was even a bit of clearing before midnight as the temperature dropped to -7F but with the clouds it is currently back up to 8. Currently obscured and calm with a few flakes of snow. Snowpack is at 66½”
Snowpack:

Date of Observation: 02/28/2023
Name: Irwin Guides

Zone: Northwest Mountains
Route Description: Irwin Tenure

Observed avalanche activity: Yes
Avalanches: Low loading patterns on W aspects BTL Reactive 8-10″ wind slabs to AS specific to terrain fetches which then transitioned into storm slabs by the afternoon. S aspects BTL stubborn wind slabs cracking but not running.
Ray SS-ASc-D1-I 12-14″ X 50′ X 75′
Weather: Extreme winds early this morning with periods of intense precipitation.
Snowpack: Study plot showed 8″ this morning and another 10″ today with 1.6″ SWE. Not confident in the snow total because of our friendly winds today. Felt more like a foot storm total.

Date of Observation: 02/28/2023
Name: Zach Guy

Zone: Southeast Mountains
Route Description: Afternoon tour. Traveled up the southeast shoulder of Gothic to 11,500′ looking for wind slab feedback, and on east and northeast aspects of Snodgrass to monitor below treeline terrain.

Observed avalanche activity: No
Avalanches: Visibility of the surrounding terrain was very limited
Weather: Whiteout conditions mid-day with blowing snow and moderate snowfall rates. Both eased through the afternoon.
Snowpack: About 5″ or 6″ of storm snow in wind-sheltered terrain, with drifts up to 18″ as I climbed into exposed, near treeline slopes with decent-sized fetches. It was easy to trigger numerous shooting cracks while skinning across the top of small, drifted terrain features. Drifts were typically 10″ to 16″ thick soft slabs, breaking on or near the storm interface.
No signs of instability below treeline except for an isolated wind drift in an obviously drifted area. A test pit on an ENE aspect produced a hard, non-propagating failure (ECTN26) on small, rounding facets about 75 cm deep.

Date of Observation: 02/28/2023
Name: billy barr

Zone: Southeast Mountains
Route Description: Gothic townsite

Observed avalanche activity: No
Weather: The wind continues to be the predominant weather feature holding steady and strong 10-15 westerly with gusts to 25. Only light but steady snow through the night with 3″ new and water 0.24″. Currently very light snowfall with no visibility and 64″ of snow on the ground as the wind shows no sign of letting up. Ever. Temperatures hold mild with a high of 26F yesterday and low today 14 with the current 16. Lots of snow transport- break a trail and turn around and it is gone. billy