Surface Hoar

CB Avalanche Center2016-17 Observations

Location: Kebler Pass Area
Date of Observation: 01/19/2017
Name: Evan Ross
Subject: Surface Hoar
Aspect: North East, South East, South, South West
Elevation: 10,500 to 12,000

Avalanches: Surface hoar/near surface facet sluffs on steep northerly aspects at 12,000ft.
Weather: Clear and calm throughout the morning. Sky’s transitioning to overcast around 1pm. S1 starting at 4:30pm.
Snowpack: Oooo surface hoar, you suck. Fairly widespread surface hoar beginning to be buried late this afternoon.. Looked to be cooking off on steep southerly aspects, but maybe not fully cooked. On south surface hoar had formed over a soft crust, on northerly aspects the surface hoar was forming over near surface facets.

South west aspect, surface hoar over a soft crust

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Northeasterly aspect at 12,000ft, surface hoar has formed over near surface facets.

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SH

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 01/18/2017
Name: Jake Beren
Subject: SH
Aspect: East
Elevation: 9,000-11,000

Avalanches:
Weather: Sunny skies and cool temps (no batts in the ol thermometer, but skinning in more layers than usual). Calm winds with a minor amount of blowing snow at ridge tops observable up toward the White Widow couloir.
Snowpack: No digging due to a bad back and late start (1200), but boot pen is less than Will’s ob from 1/15, at 25 cms. Settlement cones look to be about a foot tall on the Aspens in the valley. Roller balls off the West face of Gothic (and a skinner up with no tracks on the Spoon or W Face- hope one of you folks got on the East today!). HS at the top of the bowl was 240+. Some Southerly aspects picked up a weak crust (infer frowny face emoji).
The star of the show was widespread Surface Hoar everywhere, from the valley floor to ridge top. Up to 2 cms in size, and present even on sunnier Eastern aspects. The fog seems to have left us a present and I hope it deteriorates before the next round of weather. Keep your heads on a swivel out there friends!

Mountain Weather 1/19/2017

CB Avalanche CenterWeather

Date: 01/19/2017

Our recent beautiful weather sure was nice but lets dive back into some more storms! We have three storms coming down the line in the weather forecast. Clear skys allowed temps to drop last night and will be slower to rebound this morning. Warmer air on southwest flow and building clouds will be the theme for most of today as our next pulse of weather approaches. Snow showers will begin this afternoon but accumulations don’t look to significant. Though continued unsettled weather in the forecast should help those numbers add up. We’ll see a slight break in the weather Friday evening before the next round arrives Saturday. Then we’ll see a more pronounced break in the weather around Sunday as a small ridge builds over the western US. The biggest and best looking snow produces arrives as the third storm early next week.

Surface Hoar-Redwell Tour

CB Avalanche Center2016-17 Observations

Location: Kebler Pass Area
Date of Observation: 01/17/2017
Name: Chris Pruden
Subject: Surface Hoar-Redwell Tour
Aspect: North, North East, East, South East, South
Elevation: 9000-12100

Avalanches: Many loose snow avalanches on both sunny and shady aspects from small cornice failures and running from trees/rocks. Most of these were a day old (1/16/17). One of these stepped down to a slab on a lower eastern flank of redwell basin.
Weather: Foggy in the morning at the Kebler Pass TR. Climbed out of the clouds and into the sunshine for the rest of the day. Clouds lingered to the south and in valley bottoms. Fairly warm (25-30 F) on the way up to gunsight pass from. Cooler on shady aspects (20 F). No snow. Winds light and variable but seemed to be mostly out of the southeast.
Snowpack: Moist snow surface on sunny aspects all the way up to 12000 ft. Widespread surface hoar (some of it large) on all of the aspects we traveled on. I assume these will get baked off on sunny sides but they may persist on sheltered and shady aspects if they get buried.

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Glide cracks

CB Avalanche Center2016-17 Observations

Location: Crested Butte Area
Date of Observation: 01/18/2017
Name: Zach Guy
Subject: Glide cracks
Aspect: East
Elevation: BTL

Avalanches: Where do we live?! Glide cracks on Whetstone and reported around east brush
Weather:
Snowpack:

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Mountain Weather

CB Avalanche CenterWeather

Date: 01/18/2017

We have truly brought British Columbia’s weather to Colorado this month. Valley fog is hanging in there again today, and you will have to climb into the peaks to appreciate the beautiful bluebird weather and mild temperatures above. High clouds begin to fill in late tonight ahead of a series of three storms headed our way through the weekend, each progressively stronger. The first will bring light snow starting Thursday afternoon, the next arrives Friday night, and a much stronger system from Sunday through Tuesday brings good jet support and heavy snowfall. A preliminary glance into snow totals suggests a couple feet or more by early next week. Let’s shake the snow globe again!

Concerning structure on some slopes that previously avalanched.

CB Avalanche Center2016-17 Observations

Location: Paradise Divide Area
Date of Observation: 01/17/2017
Name: Evan Ross, Alex Ban’ass
Subject: Concerning structure on some slopes that previously avalanched.
Aspect: East, South East, South, South West
Elevation: 9,700-12,500

Avalanches: Loose snow avalanche city baby! Brings to mind Zach Guys favorite song, “its going down”, but mostly it had already gone down. East to northeast facing slopes looked to have the most activity. The biggest terrain produced D 1.5’s otherwise just D1 slufffs. Watched a few roller balls on southerly facing slopes before noon. As well as some previous loose snow avalanches as well.

viewed some large crowns on northeasterly terrain from the last cycle.
Weather: Not a lick of wind and clear sky. Overcast clouds hanging out just west of the divide and south of scarps ridge.
Snowpack: Didn’t found a single crust in the snowpack by probe while traveling on SE to SW between the elevations above. Probed to 260cm and never felt the ground either, through the terrain. No signs to instability observed in this terrain.

The outlier was an alpine ENE facing start zone at 12,450ft. Sure looked deep, but HS was only 140cm. Obviously this slope had previously avalanched but unfortunately the weak layer was still present. A 100cm F to P hard slab was sitting over 1 to 2mm faceted particles at the interface, with 3mm depth hoar at the base. CT11 SC on the depth hoar. CTM SP on decomposing stellars about 40cm down. No results at the new snow, 1-2mm faceted particles interface. Mostly bailed on the objective due to the poor structure.

The concerning structure on the ENE facing slope.

Looks deep, but isn’t.

Deep crown on Northeast aspect of Cascade Peak.

Lots of previous loose snow avalanches, mostly on east to northeast aspects.

large crown on north aspect of Pealer Peak.

Taylor Canyon Slide

CB Avalanche Center2016-17 Observations

Location: Taylor Canyon
Date of Observation: 01/17/2017
Name:
Subject: Taylor Canyon Slide
Aspect:
Elevation:

Avalanches: See photo of debris from an avalanche that ran across Taylor Canyon near the dam. We believe this ran 1/12/17.
Weather:
Snowpack:

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Rollerballs and unreactive pit results.

CB Avalanche Center2016-17 Observations

Location: Cement Creek Area
Date of Observation: 01/17/2017
Name: Zach Guy
Subject: Rollerballs and unreactive pit results.
Aspect: South East
Elevation: 8500-9700

Avalanches: Windshield tour of lower Taylor Canyon. Spotted 4 or 5 crowns from last cycle, D2 in size or less, on E to N aspects, which were probably the only slopes holding snow prior to the storm. See photos.
Weather: Valley fog, scattered to few clouds above the fog. Mild temps. Light ridgetop winds.
Snowpack: Natural rollerballs and small loose wet on SE aspects BTL. No other signs of instability.
One quick pit on SE BTL showed 75 cm of 1F slab over F+ 1mm moist rounding facets (Jan 1 interface). ECTX results, with a non-propagating BRK results with additional loading steps.

SE BTL. 1F 75 cm slab over F+ moist, rounding facets. Non-propagating results

Old crown. NE aspect BTL

Old crown. NE aspect BTL

Above the clouds

CB Avalanche Center2016-17 Observations

Location: Kebler Pass Area
Date of Observation: 01/17/2017
Name: KIRK H
Subject: Above the clouds
Aspect: North East
Elevation: 12090

Avalanches: Many visible natural “slough” like slides . Not very deep but ran a fair distance.
Weather: Calm , Sunny above the inversion.
Snowpack: Snowpack seems to be pretty solid . No signs of instability during our tour . Starting to see some surface Hoar developing