Avalanche Advisory for 2015-01-11 07:00:08

Not much new to mention since yesterday...clouds and cooling temps are keeping the snow on the firm side at elevations >8,000 on the mountain. The weak storm forecasted for late today/Monday is on track. Precipitation amounts will be light, potentially 1-4 inches of new snow (.04" water) with freezing levels as low as 5,000 - 5,500 feet. We hope this will be a nice little "refresh" and help smooth out some of the lingering sastrugi and rough spots. Northwest winds are going to kick up late today and crescendo into Monday reaching 25-35 mph with gusts higher above treeeline - not gale force but strong enough to move some new snow around. Even though new storm snow totals are not looking fat, wind blown snow loading on leeward aspects could create small wind slabs on our old, hard snow. At this point, the avalanche danger remains low for all aspects and elevations today. Staring into the crystal ball, the avalanche danger may rise for a short period near the end and after this small storm. Wind loading on E-SE-S-SW aspects near and above treeline will be of most concern. Remember, specifically on Mt Shasta, funky wind eddies and local orographics can load slopes not suspected. This slight rise in avalanche danger will all hinge on new snow accumulation: dust on crust - likely not too much of a concern. A couple inches of new snow with some wind blowing it around... we may see some small wind slabs develop in extreme terrain, near ridgetops, gullies, rock outcrops, etc.

Its a mixed bag out there. All snow available for decent recreation in the forecast area is limited to areas above 6,000 feet. Mt Shasta, Mt Eddy, Castle Lake, Ash Creek Butte all are holding anywhere from 1-6 feet of snow. This snow is a fantastic base ready for some new snow to freshen things up. We've seen a slow transition in surface conditions on Shasta itself where most skiing and other recreation has been taking place. No single snow surface condition dominates and thus one will need a variety of skiing techniques to stylishly shred Shasta's slopes. Inversions over the past week have kept lower elevation temps cooler and mid elevations warmer. Given that and some daytime sunshine, east, southeast and south facing slopes that are out of the wind and at low to mid elevations have been seeing some softening during the warmest portions of the day, ie. corn snow. Other areas one will find wind packed powder, rough sastrugi, and icy ridgetops/exposed areas. Overall, I would say conditions have improved over the week and numerous reports have come in of decent, smooth skiing if willing to hunt it down.

Smooth and firm snow conditions still persist for folks venturing onto the upper mountain, climbers and skiers alike. A helmet, ice axe and crampons are strongly recommended and self arrest skills mandatory for a safe trip. 

Beginning from top left and working clockwise: FC dropping into the East side from Thumb Rock area - {Photo: Ingmar} / South side Shastina ski with Shasta proper in the background {Photo: Ingmar} / Forrest skins up Avalanche Gulch on 1.9.15, below Lake Helen (Photo: H. Meyers} / Small wet sluff that occured sometime in the past week due to daytime warming and above freezing night time temps on the East aspect of Casaval Ridge into Avalanche Gulch, approx. 9,700 feet. {Photo: H Meyers}

Below: Riders and sliders make their way down some decent snow found in Powder Bowl, 1.10.15 {Photo: N Meyers}

Report your observations to the MSAC! A photo, a few words... send them in! (nimeyers@fs.fed.us or 530-926-9614)

Castle Lake area has a shallow snowpack. Be careful of shallow buried objects. Skiing has been reported as poor to non-existent.

Sand Flat Winter Trails: OPEN

Pilgrim Creek Snowmobile Park: OPEN, however due to lack of low elevation snow, one must drive up the road several miles before enough snow is encountered. One CANNOT DRIVE over Military Pass.

-------------------------------------------------------------------------------------------------------------------------------

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.

The Five Red Flags of Avalanche Danger any time of year include:  1) Recent/current avalanche activity  2) Whumpfing sounds or shooting cracks  3) Recent/current heavy snowfall  4) Strong winds transporting snow  5) Rapid warming or rain on snow.