Avalanche Advisory for 2014-04-05 06:32:57

Visibility was difficult again above treeline yesterday and thus kept observations on and around Gray Butte. A full tour of all aspects found 10-15cm of new, light density snow on top of a widespread, 1-3cm crust layer that formed over Wednesday and Thursday. Temperatures stayed cool enough to preserve the new snow even late in the day. Formal snowpit tests indicated a weak layer just below the crust on near crust facets with moderate force, but failure and propagation on a slope scale wasn't happening. My inclination is that the poorly developed facets are mending and not developing further.

On an east facing, 40 degree slope, one small wind slab was easily triggered. The slide had a 6 inch crown, was about 15 feet wide and ran about 70 feet down the slope. While not large enough to bury a person, larger slides such as this could be waiting for a trigger. The most common instability observed yesterday was new snow sluffing on top of the 1-3cm crust on steep slopes. Numerous loose, dry snow avalanches were easily triggered from ski cutting slopes near starting zones.

For today, I would expect the same types of instabilities as said above for all aspects/elevation areas until temps warm and the sun comes out.  As for the upper mountain, I have not been able to observe snow conditions. It's uncharted territory since this past storm cycle. I would use caution and expect isolated areas hosting small to medium wind slabs, especially after this weekend northwest winds picking up.

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From 4/4/14

The storm cycles of the past two weeks have added precious inches of snow to our low snowpack, extending our season of good climbing and skiing conditions by hopefully a few weeks. We saw a short lived spike in the avalanche danger on Monday of this past week. Numerous, small storm slab avalanches were easily triggered on many aspects steeper than 35 degrees near and above treeline on Gray Butte and one reported slide on the north aspect of Green Butte. Tuesday, our snowpack seemed to adjust well to the new snow (6-8 inches over 48 hours) and no further instability was observed over the week. Wednesday and Thursday the sun came out during the day cooked the new snow to a crisp. Which brings us to our current snow status: generally crispy (read: breakable crust) at lower and mid elevation slopes with pockets of old powder in shaded, cold and protected areas in the trees. Everything above treeline is generally wind blown in exposed areas and packed powder/powder in more protected areas. Southerly winds in the recent days has transported snow onto N - NE slopes and small to medium size, isolated wind slabs could be encountered above treeline on said aspects, albeit difficult to trigger. Overall, the snowpack sits in a transitional phase, working towards melt/freeze, but not their yet. With the weather clearing and temps warming in the coming days, we should see Shasta's famed spring skiing return, hopefully by next week.

For climbers, conditions have been excellent on all routes. With the recent new snow however, be sure to thoroughly read this avalanche advisory. Over snow travel with the new snow will be difficult (i.e. post-holing) without snowshoes/skis/splitboard at this time. The season for climbing Mt Shasta is going to be shifted forward this year. On a normal year with ample snow on the ground, good climing conditions usually start in April and can go all the way into July sometimes. This year is not the case...the best conditions to climb Shasta this year will be NOW through April and potentially May. The extent of good climbing conditions will hinge on our Spring weather. More snow could potentially extend the season and warm days with shining sun will shorten it. While the mountain looks like it's got a thick blanket of snow on it, in reality there is only about 2-5 feet of snow on the ground, depending on aspect and elevation. Good climbing conditions, in general, means snow on the mountain. As the snow melts, rockfall increases and a climb of Shasta becomes more dangerous. All in all, sooner than later will be best for climbing Shasta. Check the climbing advisory on our webpage also!

PLEASE NOTE: Snow conditions on most routes are smooth and firm, especially in the AM hours. Conditions as such have lead to accidents due to slip/falls and failure to self arrest. A slip and fall on smooth, firm and sometimes icy snow can result in a slide for life on the steeper slopes of Mt Shasta. Self arrest skills with an ice axe and proper crampon use are essential for a safe climb. Do not under estimate the importance of proper knowledge and skills with your ice axe/crampons/self arrest techniques. Further, an avalanche beacon, shovel and probe are recommended for any climbers attempting Shasta currently. Lastly, with snow on  mountain, the rockfall danger has been low. However, rime ice can plaster exposed rocks on Shasta this time of year. As the days warm, the rime ice will flake off and fall onto climbers below, especially on the Avalanche Gulch route. Ice is like a rock and a HELMET should always be worn.

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While Northgate, Brewer Ck and Clear Ck trailheads are officially closed, the bathrooms are still open with packout bags inside, and one can still access the Mt Shasta Wilderness. However, your summit pass and wilderness permits must be purchased at McCloud or Mt Shasta Ranger Stations. NO DOGS are allowed in the Mt Shasta Wilderness OR Sierra Club Property. Thanks!

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Terrain:  Remember most of the terrain that we like to play on is greater than 30 degrees.  Avalanches are possible on anything steeper than 30 degrees.  Avoid cornices, rock bands, terrain traps and runout zones of avalanche paths.

Weather:  Most of our areas avalanche danger will occur 24-48 hours after a storm. We still can see persistent weak layers from time to time and we always will be sure to let you know about that!  Heed the basic signs: Wind (significant snow transport and depositions), Temperature (rain/snow/rain/snow, which in turn weakens the snowpack), and Precipitation (Snow or rain add weight and stress to the current snowpack).

Snowpack:  If snow accumulates, give the snowpack a chance to adjust to the new snow load before you play on or near steep slopes (greater than 30 degrees).  Most direct action avalanches occur within 24-48 hours of recent snowfall.  Watch for obvious signs of snowpack instability such as recent natural avalanche activity, collapsing of the snowpack (often associated with a “whumphing” sound), and shooting cracks. If you see these signs of instability, limit your recreation to lower angle slopes.

Human Factor: Don’t forget to carry and know how to use avalanche rescue gear. You should NOT be skiing or climbing potential avalanche slopes without having beacons, shovels, and probes.  Only one person in a group should be exposed to potential avalanche danger at a time.  Remember, climbing, skiing, and riding down the edge of slopes is safer than being in the center.  Just because another person is on a slope doesn’t mean that it is safe.  Be an individual!  Make your own decisions.  Heed the signs of instability: rapid warming, “whumphing” noises, shooting cracks, snowing an inch an hour or more, rain, roller balls, wind loading, recent avalanche activity.