Whetstone and Mt. Emmons obs

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 03/07/2017
Name: Zach Guy, Evan Ross
Subject: Whetstone and Mt. Emmons obs
Aspect: North East, East, South East
Elevation: 9000-11,600

Avalanches: No signs of instability near or below treeline.
Weather: Decreasing winds through the day. Few clouds.
Snowpack: A few inches of new snow. Traveled in gullies, leeward ridgelines, and other suspect features for wind loading N/BTL and drifts were negligible; less than 3″ deep. It appears the extreme winds blew more snow away than loaded it. In areas where we did encounter thin drifts, it was easy to produce cracking, indicating poor bonding.
Investigated the PS structure NTL. On SE aspects, there was a ~3cm crust capping a faceting slab (~30 cm) over the crust facet layer, and this structure appeared to be non-concerning where we traveled. On an E aspect, several crust/facet layers were buried 40 cm deep, and produced non-propagating, broken fractures under hard initiation (ECTN 25 BRK).

Smith Hill

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 03/08/2017
Name: El Duderino
Subject: Smith Hill
Aspect: East, South East, South West, West
Elevation: 8,900-9,800

Avalanches: none observed
Weather: cold & moderate wind in AM gave way to mild & calm in PM
Snowpack: 2 small collapses at ridgeline on Easterly wind loaded ~20* slope

Mountain Weather

CB Avalanche CenterWeather

Date: 03/08/2017

Our weather will continue its transition towards clear, calm and warm as weak high pressure develops over the West. We’ll see temperatures rise to freezing today and reach towards 40F tomorrow under mostly clear skies and fairly tame winds. Enjoy the sunny weather — the storm track looks to stay north of us through the next week. .

Stormy BC Ski Day

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 03/06/2017
Name: Jake
Subject: Stormy BC Ski Day
Aspect: North East, East
Elevation:

Avalanches:
Weather: Indeed. OVC to Obscured back to OVC. Moderate to Strong Winds from the North at valley floor all day, WSW at ridge top, somewhat calm in the trees. S1-S3 rimed PP and grauple (sp?) throughout day with a lull at 1630. Full conditions, prime day for an extra buff and a double check on client clothing.
Snowpack: 1 big whumpf in the valley just before starting our ascent, no other signs of instability. Similar results to Dave with a quick pit just off the ridge on skier’s Right of the bowl- CT 16 45cms down on crust. Sorry I didn’t get a better description of the break, little blustery but if we want to go old school I’d say Q1.25 to be precise. Broke clean but didn’t pop. No signs of instability on the ski, kept it low angle. Certain wind transport all day.

Mountain Weather

CB Avalanche CenterWeather

Date: 03/07/2017

The storm track is shifting northward, and we’ll be under dry and cool W/NW flow today as weak high pressure begins to develop and carry us through to the weekend. Winds are still gusting above 50 mph this morning, but will start to ease later this afternoon. Temperatures will rebound about 10 degrees warmer tomorrow.

Mountain Weather 3/6/2017

CB Avalanche CenterWeather

Date: 03/06/2017

If you didn’t notice the wind last night you must have been sleeping in a cave. Good thing it’s not trash day in Crested Butte. A low-pressure trough is pushing through Colorado with a relatively low elevation jet and strong pressure gradient bringing intense winds to the area. Early this morning at 12,000ft southwest winds were blowing 60mph and gusting to 100mph on Scarps Ridge. Unfortunately, we only got the wind last night and not the snow. This morning a cold front is pushing into the area and bringing a band of heavier snow showers. After this cold front moves in this morning, we’ll see a dropping temperature trend and decreasing snow showers. Westerly winds will remain elevated through the day and finally taper this evening. Dryer northwest then west flow will set up for the rest of the work week and with slowly rebounding temperatures through the week.

Coneys 3/5

CB Avalanche Center2016-17 Observations

Location: Paradise Divide Area
Date of Observation: 03/05/2017
Name: Annie Tomlinson
Subject: Coneys 3/5
Aspect: East, South East
Elevation: 11,200 ft

Avalanches:
Weather: Overcast with no precip and light wind in morning. Air temp was 1*C at 12:50. At approx 13:00, SW wind increased with moderate gusts and precip began.
Snowpack: Variable conditions depending on aspect. Sun crust on S & SE aspects. Cold, faceted snow in sheltered, N –> E aspects. Crust at 5″ depth on E aspect, BTL. Wind transport was observed beginning at 13:00 on top of Coneys. Visible crown and debris from remote triggered slide on 3/2. No signs of instability were observed today.

Axtel Obs

CB Avalanche Center2016-17 Observations

Location: Kebler Pass Area
Date of Observation: 03/05/2017
Name: Will Nunez
Subject: Axtel Obs
Aspect: North, North East, East, South East
Elevation: 9,600-11,700

Avalanches: We came a crossed a large debris pile at the bottom of the Pencil, A persistent slab D2.5 ripped out from the upper SE flank, moving rock and trees with it running 100ft a crossed and 1000ft down from the exit of the couloir.
Weather: Overcast sky, mid 30*F, Light wind out west
Snowpack: No signs of instabilities, warm temps from the days before helped form sun crusts on the southerly slops and gullied features. 3mm surface hoar growth on the N-E aspects above TL and BTL. HS ranged from 250 to 300

Unreactive PS and weak surfaces BTL

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 03/05/2017
Name: Zach Guy
Subject: Unreactive PS and weak surfaces BTL
Aspect: North, North East, East
Elevation: 9,000-11,100 ft.

Avalanches: None
Weather: Overcast skies, S-1 at 4 p.m. Calm winds in sheltered areas where we traveled, but snow transport observed on some high peaks from strong SW winds.
Snowpack: Traveled on numerous north through east facing slopes below treeline on Mt. Axtell and Mt. Emmons with no signs of instability and found unreactive persistent slab issues in several pits (See photos). Buried facet or facet/crust layers are generally 35-40 cm deep, ~1mm in size and rounding. Slabs are F to 4F and decomposing. Surfaces are generally 0.5mm near surface facets, transitioning to thin melt freeze crusts around 80* (ENE). Isolated pockets of preserved surface hoar, up to 15mm in size on E and N aspects.

NE aspect, 9,600 ft. Happy Chutes. 2 crust/facet layers ~35 cm deep. ECTN 22, BRK on facets below the bottom crust.

NE aspect, 10,600 ft. Mt. Axtell. ECTN 26, BRK on rounding facets 45 cm deep.

East aspect, 11,000 ft. Mt Axtell. Multiple crust facet layers 35 to 60 cm deep. ECTN 24 BRK on 1mm facets above the top-most crust.

Isolated pockets of large, surface hoar still in tact on E and N aspects, in some places above a crust. Most surfaces were small grained, near surface facets or wind-broken rounds.

North aspect, 10,000 ft on Mt. Axtell. ECTX. 1mm rounding facets buried 35 cm deep. Rain crust over rounding facets buried 65 cm deep.

Mountain Weather 3/5/2017

CB Avalanche CenterWeather

Date: 03/05/2017

The next Pacific trough of low pressure is coming ashore today as we see a turn back to stormy weather. Ahead of this system today, clouds will be on the increase and winds will be very strong/gusty. We may see a dusting of new snow early this afternoon, while the best snow accumulations will happen tonight. Areas of the forecast favored by southwest flow will see the most snow accumulation, like those in the Kebler Pass and Paradise Divide. The arrival of a cold front will bring dropping temperatures tonight into tomorrow while norther west flow continues to bring cool air into the area as this storm departs tomorrow. The big news for today will be the wind!