Location: Brush Creek Area
Date of Observation: 04/13/2019
Name: Evan Ross

Subject: White Rock Sluffing and Thin Wind Slabs
Elevation: 10,000-13,400

Avalanches: Some small Loose Wet Avalanches in the new snow that accumulated today, Small Loose Dry Avalanches on northerly faceting slopes and some Wind Slabs up to a foot thick there were stubborn and produced few results.

A few more Wet Slab Avalanches observed from early last weeks warm up.

Weather: High clouds had cleared out in the morning, but low convective clouds kept the small storms rolling through the day. Generally light winds, but strong enough on ridge lines to transport snow as the storms rolled through.
Snowpack: Storm totals for the day were around 3 to 4 inches. Managed plenty of terrain for drifted features and the threat of trigging old Wind Slabs at upper elevations. Then as the snow accumulated through the day we continued to manage terrain for new small Wind Slabs. The Wind Slab problem was suborn, and other than avoiding some terrain, we saw few results. Sluffing in the new snow was the other small avalanche problem. Heightened avalanche conditions on specific terrain features felt just right.

Location: Crested Butte Area
Date of Observation: 04/12/2019
Name: Whitney Gilliam

Subject: Schuylkill Small Wet Loose
Aspect: East
Elevation: ~9,900ft

Avalanches: Two separate small Wet Loose skier triggered avalanches at about 11:45am on a small convexity on the slope.
Weather was much warmer and sunnier than expected so this type of avalanche was predicted!
Noticed the snow heating up around 11, and turned around earlier than planned.

Weather: Sunny and Warm. No wind.

Photos:

Location: Paradise Divide Area
Date of Observation: 04/12/2019
Name: Evan Ross

Subject: Strong April Sun Cooking It Down
Elevation: 9,000-12,300

Avalanches: Natural Loose Wet Avalanches were small in size, but powerful given their wet nature. These avalanches mainly failed on east to south to west aspects, while the recent storm snow had also become moist on some northerly aspects.

One fresh D2 soft slab had failed below an easterly ridge at 12,000ft. An older D2 Wet Slab was also observed in the Happy Chutes ENE ~9600ft.

Weather: Partly cloudy sky, with plenty of that strong April Sun. Winds were calm to light and 11,000’ish FT weather stations showed high temps in the mid to upper 20’s.
Snowpack: The sun did its thing and cooked down the new snow. North stayed dry, but other slopes all saw the effects of the sun up to the elevation traveled. The deepest drifts where isolated in the terrain and didn’t seem to cover big parts of the slopes. Managing terrain for a windslab avalanche problem around a foot thick was spot on. While a Loose Wet Avalanche problem developed, it was smaller in comparison.

Location: Kebler Pass Area
Date of Observation: 04/11/2019
Name: IG

Subject: Irwin Cat Ski Obs
Aspect:
Elevation: 10,400 – 12,000

Avalanches:

Two D1’s out of Swill and Bender. The Swill windslab was intentionally skier
triggered and the bender D1 was triggered from kicking cornices that triggered a shallow, reactive windslab.
Bender SS-ASc-R2-D1.5-I U (25cm x 30m x 70m)
Swill SS-ASc-R2-D1-U U (25cm x 25m x 40m)

Weather: Snowing S1 to S2 throughout the day. West winds 10-20 G 35 shifting to northwest mid day. Cold temps with ridge top highs of 11. NW Winds look to be decreasing overnight tonight.

Snowpack: 10- 25 cm new snow throughout UWW, EBM and SBM. Upper west wall start zones are holding the least amount of new snow. In round two and strike three we observed shallow storm slabs breaking
10′ in front of skis. These slabs are not running yet. There is a mid storm instability above the MFcr old snow surface. This is most likely the same, dense 3″ of snow at the base of the study plot boards observed this morning. EBM had 30cm of new snow concentrated on the ridge top. SBM had 15-20cm of new that has not slabbed up by mid day.
Photos:

Location: Cement Creek Area
Date of Observation: 04/11/2019
Name: Eric Murrow

Subject: storm check out east
Aspect: East, South East, South, South West, West
Elevation: 9,000′ – 12,100′

Avalanches:

nothin new

Weather: Overcast skies with light snowfall. Minimal accumulations between 11am and 3pm. Winds were blowing most of the day with strong gusting. Drifting of the new snow was observed even below treeline in open areas. Unfortunately, dust came immediately prior to this round of snow and will likely start to appear during the next melting period.

Snowpack: New snow accumulations ranged from about 2″ to 6″. It was a bit difficult to gauge new snow at upper elevations as the wind scoured, drifted, and pressed the snow in most open terrain. Drifts up to 18″ were observed and likely deeper on some alpine features. Drifted and wind-pressed snow readily cracked and formed a very cohesive slab.

Poked a quick hole on a west aspect at 10,000′ with an HS 155cm and found free water had percolated down to within 45cm of the ground with percolation tubes present to that level. The next warm period will likely see free water drain down to the oldest and weakest snow near the ground at this location and make Wet Slabs a concern.

Photos:

Location: Kebler Pass Area
Date of Observation: 04/11/2019
Name: MR

Subject: Schuykill pow and windslabs
Aspect:
Elevation:

Avalanches:

Localized windslabs just above the bench, 10,200’ or so, skier triggered a small r.5d.5 slab which ran with little energy, 10 inch crown

Weather:

Snowpack:
Photos: