Avalanche Advisory for 2014-04-06 06:39:28

Yesterdays observations on Gray Butte, Green Butte and in various areas of the Old Ski Bowl indicated that the snowpack continues to settle and consolidate. Formal snowpit tests did not reveal any signs of instability associated with the recent storm snow or wind slabs. Snowpit data in said areas indicated that the near crust facets (weak snow under an old crust) continues to gain strength.

Of biggest concern for today will be wet-loose avalanches within the top 4-6 inches or more of new snow on top of our widespread crust layer. Sunny slopes E - SE and S facing saw widespread roller ball and pin wheel action yesterday as temperatures warmed into the afternoon. Small to medium size wet loose slides were easily triggered within the top layer of snow. While we will get some refreeze, we will likely see more of that today. These wet loose slides generally start small and entrain more snow as they slide down the hill. Slopes steeper than 35 degrees and E - SE and S facing will see most of this action today. With the warming trend occuring, I expect a general decline in the avalanche danger and a move toward more spring corn by mid week!

Wind out of the northwest did cause some new wind loading and formed small new wind slabs up to 2-4 inches thick by the afternoon. These very small wind slabs did not grow large enough to cause problems for backcountry travelers. Continued northwesterlies today could increase the size of the newly formed wind slabs. I don't expect said slabs to gain enough size to pose a real threat, but use caution regardless on leeward aspects, NE - E - SE - S. Wind slabs will be most sensitive to trigger during the next 24-48 hours.

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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.