Mountain Weather

CB Avalanche CenterWeather

Date: 03/25/2016

A complex system system is developing over Colorado over the next 24 hours, and models are still in disagreement on how this one will come together. A shortwave trough embedded in northwest flow will push a cold front across our mountains late morning or mid day, spreading a few inches of snow across our zone today under moderate westerly winds. The orographically favored snow belt could squeeze out twice that. Tonight, a more significant trough descends towards the 4-corners region carrying good moisture. Snowfall accumulations generally look to be in the 5-10″ range out of this second pulse of snow, under tamer winds.

Family Ski day at Snodgrass

CB Avalanche Center2015-16 Observations

Location: Crested Butte Area
Date of Observation: 03/24/2016
Name: Dave and Ross
Subject: Family Ski day at Snodgrass
Aspect: North, East
Elevation: 9,600’-10,600

Avalanches:
Weather: Mostly sunny, light wind, mid 30’s for a high.
Snowpack: No signs of instability. Could feel the old layer with 4- 8 cm of new on top. Skiing was supportive and fast

Irwin Obs

CB Avalanche Center2015-16 Observations

Location: Kebler Pass Area
Date of Observation: 03/24/2016
Name: Irwin Guides
Subject: Irwin Obs
Aspect: East, South, West
Elevation: 10,000 -12.000 ft.

Avalanches: some sluffing in ruby range, no significant activity, NE bowl of Owen may have slid mid storm, snow surface looked a bit roughed up, but covered by recent snow.
Weather: Winds less than 10mph most of day, but increasing last several hours ahead of next storm. Temperatures rose from single digits early to 18º on ridge and 29º at study plot. Trace snow accumulation. Low level stratus clouds built and dissipated most the day with increasing clouds last hour with flurries.
Snowpack: Cold powder this morning quickly transitioned to heavy moist snow in upper 12” of new snow. Easterly and southerly snow in lower 2/3rds of terrain most cooked. Cool west breeze minimized moistening in west facing terrain and UUWW for tomorrow, but still got moist. Snow safety routes this morning verified rapid stabilization of snowpack overnight, minimal windslabs and storm slabs all but disappeared. Early prefrontal red dust layer quite visible where cat has cut roads, cornices, etc. Simple hand shears continued to show failure 4cm above red dust in storm snow.

Pizza and Cake Pow Laps!

CB Avalanche Center2015-16 Observations

Location: Crested Butte Area
Date of Observation: 03/24/2016
Name: JSJ
Subject: Pizza and Cake Pow Laps!
Aspect: South East, South
Elevation: 9,200-12,400′

Avalanches:
Weather: Mostly sunny, light to moderate winds from the WNW, cool temps NTL & ATL
Snowpack: 15 cms HST (at TH), and about 50 cms HST (at summit). Cold, dry, and uncohesive in the morning, becoming moist and slabbing up by 1300. Resting on a soft, dusty MF crust. Easily skier triggered by early afternoon as wet loose slides once the HST became moist on steep terrain features via ski cuts, and running on the old MF crust. Surfaces ATL staying cold where exposed to wind on the surface.

Thick and Crusty

CB Avalanche Center2015-16 Observations

Location: Crested Butte Area
Date of Observation: 03/24/2016
Name: WN
Subject: Thick and Crusty
Aspect: South East, South
Elevation: 9,200’-12,400′

Avalanches: Small Loose wet slide where observed running on the old dust MF crust as well as a small skier triggered loose Storm slab E aspect. See Photo.
Weather: Mostly clear with low clouds in the valley in the AM, light to moderate winds from the WNW, cool temps NTL & ATL.
Snowpack: The snow was quick to warm up today on S-SE aspects becoming moist and thick before 11:00am. Boot pen 10cm and HS 225cm at 11,000′. Lots of settlement BTL.

Storm-Slab

Star Pass obs

CB Avalanche Center2015-16 Observations

Location: Brush Creek Area
Date of Observation: 03/24/2016
Name: Friends Hut Field Team
Subject: Star Pass obs
Aspect:
Elevation: Near/ Above treeline

Avalanches:
Weather:
Snowpack: Snow totals ended up being far less in the Friend’s Hut zone than other areas. Our storm total was only 3” and transport was minimal. Cornices, drifting and loading upon observation was minimal and controlled by the team moving about on both sides, above and below Star Pass. Teams split up and moved into the basin systematically in radio contact to slice and dice any suspect slope. Most cuts we did were no more than a few inches of new snow on hard surfaces. Obs are decidedly thin new snow, some snow collection in low lying gullies and persistent slabs are stubborn and triggering unlikely.

No storm instabilities but propagating persistent slab results

CB Avalanche Center2015-16 Observations

Location: Paradise Divide Area
Date of Observation: 03/24/2016
Name: Zach Guy
Subject: No storm instabilities but propagating persistent slab results
Aspect: North East
Elevation: 9,300-10,700

Avalanches: No recent avalanches observed from Slate River Road, with good views of Emmons and Schuylkill Ridge
Weather: Scattered clouds, mild temps, calm winds, pulse of S1 near sunset.
Snowpack: 25-30 cm of settled storm snow over a dust layer, well bonded to old interface, with no fractures in stability tests and no signs of instability on steep rollovers. Minimal signs of windloading in this area. Snow surface had moistened earlier in the day and was refreezing into a breakable crust on pitches with a ENE tilt.
One profile on a due north slope BTL showed the March 6 facet layer had gained significant strength since my profile in the same area last week. Hard ECTN results and Q2 fractures in compression tests on this layer, Near treeline on a NE aspect, the same layer was above a very thin melt-freeze crust, and below 80cm of 1F slab. We got repeatable hard ECTP Q1 results on this layer (see video).

Sluffing

CB Avalanche Center2015-16 Observations

Location: Paradise Divide Area
Date of Observation: 03/23/2016
Name:
Subject:
Aspect: North
Elevation: 11,000

Avalanches: New snow in steep and protected N facing trees was sluffing fast and heavy with every turn, leaving debris piles 3-5′ deep on flat benches. No propagation.
Weather: Snow of varying intensity and gusty winds out of the NW
Snowpack:

anthracites avy activity

CB Avalanche Center2015-16 Observations

Location: Kebler Pass Area
Date of Observation: 03/23/2016
Name: MR
Subject: anthracites avy activity
Aspect: North, North East
Elevation:

Avalanches: skier triggered r2d1 in rock chute, looks like it was triggered by a ski cut on the first convexity, new snow fracturing like a slab and running full width and about half of the length of the chute. We triggered any r1d1 pockets that were left on anything 35 degrees or steeper. Also remote triggered r1.5d1 in baby bowl while exiting rock. Blowing snow made it difficult to evaluate depth and location of crown, assuming the same as in rock.
Multiple naturals look to have run mid storm in the trees and openings to skiers left of seven bowl.
Weather: blowing and snowing, wind moving big trees and transporting snow everywhere, including onto the skin track in between laps
Snowpack: 8-12 inches new snow

Mountain Weather

CB Avalanche CenterWeather

Date: 03/24/2016

A few weak shortwaves embedded in northwest flow today will bring partly cloudy to mostly cloudy skies and generally light winds today. A low pressure trough digs out of the northwest tomorrow. We’ll see increased clouds and moderate winds ahead of this system, and sometime on Friday an unorganized cold front swings through the Elk Mountains, spreading snowfall from the northwest to southeast, with winds easing in its wake but snowfall continuing. Snow numbers into Saturday look to be in the 4-8″ range form Star Pass and 3-6″ range for Taylor Pass, with potential for larger numbers in the favored western portion of our zone.