West Brush Creek

CB Avalanche Center2015-16 Observations

Location: Brush Creek Area
Date of Observation: 12/20/2015
Name: Ian Havlick
Subject: West Brush Creek
Aspect: North East, East, South East, South
Elevation: 9500-12000

Avalanches: Popped a decent storm slab out on a steeper roll on NE facing avalanche path BTL. Slab was probably 60cm, and had some push to it., collapsing and propagating probably 20ft. Did not feel comfortable on steep terrain today, however, did ski small steep features nervously.
Weather: Cold air advection and orographics was surprisingly heavy and last throughout tour, showery in nature ranging from S-1 to S5. Around 6″ new in Brush overnight and today. When we gained more near treeline ridgeline, W-NW wind was a steady 15mph with a few gusts to 30. No real Solar effect on any terrain today.
Snowpack: Snowpack was surprisingly deep, but expectations may have just been that low… HS ranged 40cm to 120cm depending on wind effect and elevation. 3-5mm depth hoar first 10cm, smaller facets, with about 15-50cm new snow which was becoming slabby , especially below treeline where new snow is cohesive enough hold slab above super weak, larger grained facets. Extended column tests showed no slab firm enough for ECT to show, but was getting localized collapses around skis all day. one ECT near ridgeline after finding old hardslab. ECTPV and ECTPE SC below hardslab. Windloading confined to ridgelines where we travelled. No wind effect BTL, aside from open meadows.

IMG_2741

skier triggered BTL pocket on steep roll. Lots of hangfire 2nd skier avoided by skiing bed surface

20151219WBrushPit9500-page-001 BrushRidgeline20151220-page-001

 

Mountain Weather 12/20/15

CB Avalanche CenterWeather

Date: 12/20/2015

A small trough will bring a return to light snow showers today. Winds last night were forecasted to be fairly strong above treeline and those westerly winds will continue today. A few other very small disturbances or wiggles in the flow will keep us in unsettled weather heading toward Tuesday. Around the Tuesday time frame, the jet stream moves over Colorado while pulling in good pacific moisture. Snowfall accumulations will start ramping up with the arrival of the jet and this moisture.

Anthracites

CB Avalanche Center2015-16 Observations

Location: Kebler Pass Area
Date of Observation: 12/19/2015
Name: Ian Havlick
Subject: Anthracites
Aspect: North, North East
Elevation: 10500-11500

Avalanches: observed small windslab (50′ x 10-20″ deep) on NE facing slope in extreme terrain on Whetstone, as well as similar size windslab on SE facing slope at ridgeline in Anthracites.
Weather: Overcast, with cold morning but warmed nicely. Light SW breeze at ridgetop today. Solar was present but not intense.
Snowpack: Travelled standard uptrack in Anthracites, snowpack was consistent 80-120cm deep, most notably a very widespread layer of surface hoar from last night’s cold, clear, calm night. Surface hoar 4-6mm, and present in shorter pungey trees all the way to branches. In darker timber SH was NOT present. Also evident was drifts in trees from strong NW winds last few days.

See video for test pit results. ECTX, and ECTP30 – sudden collapse at ground on 3-5mm depth hoar.

no signs of instability today aside from spooky pit results.

Anthracites20151219_graphicalpit_Havlick-page-001

Pittsburg

CB Avalanche Center2015-16 Observations

Location: Paradise Divide Area
Date of Observation: 12/19/2015
Name: Alan Bernholtz
Subject: Pittsburg
Aspect: North East
Elevation: 10,500

Avalanches: None
Weather: Partly cloudy, warm and calm
Snowpack: Shallow unconsolidated snowpack 50-70 cm. Large surface hoar and loose snow on the surface. Not much of a mudpack to speak of. No slab was observed.
Skied terrain around 40 degrees with no results. Very unconsolidated weak snow.

Ruby Range

CB Avalanche Center2015-16 Observations

Location: Kebler Pass Area
Date of Observation: 12/19/2015
Name: JSJ, Donny, Level 2 Class
Subject: Ruby Range
Aspect: North, North East, East, South East
Elevation: 10,500-11,900′

Weather: Increasing clouds; Increasing temps; High of -1C / Low of -4C; Calm to Light SSW winds; Blowing snow off ridge tops ~12k SSW
Snowpack:

unnamed

Snodgrass TH

CB Avalanche Center2015-16 Observations

Location: Crested Butte Area
Date of Observation: 12/19/2015
Name: Jake, Chris, Avy 1 Prep Course
Subject: Snodgrass TH

Weather: Grey bird, No wind
Snowpack: HS 45cms, Facets capped by big SH

Snowpit Axtell Glades

CB Avalanche Center2015-16 Observations

Location: Kebler Pass Area
Date of Observation: 12/19/2015
Name: Jimmy Buchanan
Subject: Snowpit Axtell Glades
Aspect: West
Elevation: 9,600 ft.

Avalanches: None.
Weather: Scattered clouds, see profile.
Snowpack: See profile.

Axtell-Dec.-19

Cement Creek Snow Coverage

CB Avalanche Center2015-16 Observations

Location: Cement Creek Area
Date of Observation: 12/18/2015
Name: Evan Ross
Subject: Cement Creek Snow Coverage
Aspect:
Elevation: 9000,-12,000 along road

Avalanches: Non observed.
Weather: Partly Cloudy becoming overcast in the afternoon. Calm wind.
Snowpack: BTL: Very little snow. About 30cm HS on average. 2″ settled storm snow over facets or crusts.

NTL: Looked like the most continues snow coverage and deepest HS. If persistent slab structure is still intact, this looked like the most likely elevation to find that avalanche problem.

ATL: Snow coverage is mostly confined to gullies and wind loaded areas. Looked very “continental” with generally very little snow coverage.

Phone book style wind slab resting over facets with natural crack running through convexity. HS about 50cm in deepest part of the wind loaded feature. South aspect at 12,000ft

IMG_1076

Northwest side of Lambertson Massif.

IMG_1075

North Facing shaded trees NTL

IMG_1069

West side Italian Mountain

IMG_1078

Looking west to Crystal Peak and Star Pass in the distance

IMG_1085

NW facing bowl on Cement Mountain

Mountain Weather 12/19/15

CB Avalanche CenterWeather

Date: 12/19/2015

A the high pressure ridge axis moves east of us today, we will see warm southwest flow ahead of the first in a series of Pacific waves. Mountain temperatures will climb into the 30’s above valley inversions today with clear skies. Tomorrow, a poorly organized cold front swings in from the northwest, bringing showery snowfall beginning midday. Accumulations should be less than a few inches by sunset. Unsettled weather continues early next week before a more powerful system arrives Tuesday into Wednesday. Details to come.