Avalanche!!!! The Snowpack Variable 


Snowpack is the last variable that we will use for clues.  By combining the clues you observe, identify and feel from the snowpack, a decision should easily be made whether or not the snow is unstable and has potential to slide. Some of the signs of avalanche are obvious.  The following clues are direct indications of instability in the snowpack: 


Recent Avalanche Activity 
Again, recent avalanche activity is the best indicator of dangerous slopes, especially when it is on slopes of similar aspect and steepness.  In other words, if you see the debris from a recent avalanche, know that there is danger of additional avalanches on similar slopes. 


                                              A bad day on the snow 

Recent Wind-Loading  
Recent wind-loading is another indicator of avalanche danger.  Smooth "pillows" and cornices as well as snow plumes of the ridge tops are indicators of wind-transported snow.  This means increased stress is being exerted on the snowpack due to the addition of the wind deposited snow.  Furthermore, wind deposited crystals develop dangerous "wind slabs," since this type of crystal is subject to numerous collisions while the snow is wind-blown. 


Hollow Sounds 
You must use your ears as you evaluate avalanche hazard.  "Drum-like" or "whumpf" sounds that occur under your feet indicate unstable slab conditions.  Also, pay attention to distinctive settling sounds; feeling the snow settle or drop are clues of an unstable layer of snow...indicating a dangerous avalanche condition. 


Shooting Cracks 
Look closely at the terrain you wish to cross.  Cracks in the snow around you are an excellent indicator of avalanche danger, especially if they are occurring around you as you move across the snowpack. You should not only avoid the slope where you see or produce cracks, but also any slopes with similar profile and/or orientation. 


Snow Stability Tests 
Through additional training, you can learn to recognize the weaknesses in the snowpack by evaluating a cut-away of the snow layers.  For now, just remember that avalanches occur when a weak layer in the snowpack fails.  Your ability to recognize these weaknesses will help you make an educated decision regarding safe backcountry travel. 


Conclusion 
In summary, by looking, listening and feeling you should be able to recognize, evaluate and avoid avalanche hazards that you may encounter on your next backcountry trip.  You must be thinking avalanche whenever you are on or near slopes, regardless of the slope size and time of year.  By always thinking avalanche you will be much more observant, you will gather more information from clues, and you will become a better decision-maker


For more information on avalanche safety check out the Mountain Rescue Associations public education program @ http://mra.org/images/stories/training/Avalanche.pdf as well as our Backcountry Skiing & Riding Safety Video  

Courage - Commitment - Compassion
     Mountain Rescue Association 

The "Average" Avalanche

Avalanches come in all shapes and sizes.  The average snow avalanche is 2 to 3 feet deep at the fracture line, about 150 feet wide and will fall about 400 feet in elevation.  That's a slide area bigger than a football field!  What's more impressive is that the average avalanche travels at speeds around 50 M.P.H., a little faster than most of us like to ski!  The average time duration of a slide of this size is less than 30 seconds.  This is the size of avalanche that catches and kills most backcountry travelers.

Avalanches can be much larger...some of the largest reported avalanches have involved complete mountainsides of snow, the area of 20 football fields, having a depth of 10 feet at the fracture line and falling over 1½ miles at speeds well over 100 miles per hour!  As impressive as these avalanches are, generally the smaller ones are the killers.  In fact, 50% of avalanche fatalities are killed in slides of less than 100 feet and people have been killed in slides of less than 40 feet.  The bigger ones almost always release from natural causes and do not involve people unless they happen to be in the wrong place at the wrong time. Artificial triggers, such as snowmobiles or skiers are much more effective at releasing small to medium sized avalanches in shallower snowpack, where the stress caused by their weight is enough to cause the snowpack to fail.

Avalanches are a powerful phenomenon.  In 1969 at a ski hill in Washington, steel chair-lift poles were bent in an avalanche.  In a recent Colorado avalanche, a flashlight inside a glove compartment of a buried automobile was found completely packed with snow.  Larger avalanches possess the force to uproot mature forests and even destroy structures built of concrete. The reason, forces in excess of 15,000 lbs. per square foot.

The fastest recorded avalanche occurred in Japan and was measured to be traveling at speeds in excess of 230 m.p.h.

Avalanches come in two distinctly different types...  “Loose Snow” and “Slab”avalanches.

Loose snow avalanches are a cohesionless mass of snow that start at a point and fan out as they run, forming an inverted "V".  This type of avalanche usually involves small amounts of near-surface snow and is not considered a major threat to people.  Do not lose respect for these slides as they have taken lives.

Slab avalanches, on the other hand, start when a large area of cohesive snow fails and slides down the slope.  There is a well defined fracture line from where the snow broke away.  In addition, there may be angular blocks or chunks of snow in the slide, sometimes larger than a refrigerator.   A slab avalanche can involve a range of snow thickness from just near surface layers to an event that includes the entire snow cover down to the ground.

Slab avalanches are almost always caused by additional stress on the hill, such as a snowmobiler or skier. Since slab avalanches cause nearly all avalanche accidents, it is important to understand the conditions within the snowpack that lead to these slab avalanches

Snowstorms and wind-redistribution cause the snowpack to develop in layers. Once a layer has achieved sufficient cohesive strength, the first prerequisite for a slab avalanche has been established.  Weather will help add the second requirement...  a weak layer.  If a weak layer has developed underneath a strong layer, the perfect recipe for an avalanche exists.  If the weak layer fails, the cohesive strong layer above it will fracture and fall away from the stress. Both ingredients - a cohesive layer of snow and a weak layer below - are necessary for a slab avalanche.

When the strong layer fractures, the crack is estimated to shoot across the snowfield at a speed of over 1000 miles per hour.

In our next few posts we will discuss the three main variables that help develop a potentially unstable snowcover:  weather, terrain and snowpack. By understanding these variables, backcountry users will have a better chance of predicting avalanche danger.

For more information on avalanche safety check out the Mountain Rescue Associations public education program @ http://mra.org/images/stories/training/Avalanche.pdf as well as our Backcountry Skiing & Riding Safety Video  

Courage - Commitment - Compassion
     Mountain Rescue Association 

AVALANCHE!!! 


Avalanches are a natural phenomenon.  They have been recorded as far back as 192 BC, when Hannibal crossed the Alps.  At one time, it was thought that avalanches were caused by evil witches living in the villages below.  These witches were often burned at the stake after a destructive avalanche. 


The whole key to avalanches is gravity.  Without gravity, there would be no avalanches.  Every flake of snow and every piece of rock has but one wish...  to succumb to gravity and fall to a lower point. It has been estimated that 1 million avalanches occur worldwide each year.  Most of these occur in the Alps in Austria, Switzerland, France and Italy.  In the United States, 100,000 occur annually. 
  
The worst recorded avalanche in the U.S. occurred in 1910 in Wellington, Washington and left 96 dead with 22 survivors.  The worst known in the world occurred in Yungay, Peru and left 20,000 dead.  This avalanche was measured to be 10 miles long, 1 mile wide, and displaced 3 million cubic yards of snow.  3 million cubic yards of snow...  That's enough snow to fill a 200 story building the size of a football field. 


More than 180 people are caught in avalanches each year in the United States.  Of these, 90 are partly or completely buried, 29 are injured and an average of 28 are killed.  Over 200 people die worldwide each year.  These statistics are based on reported burials...  it is safe to assume that many more burials occur than are actually reported. 


From 1950 to 2001, avalanches in the United States killed 491 people. Recreationalists accounted for the vast majority of avalanche fatalities, with climbers, ski tourers, lift skiers, and snowmachiners comprising most of the recreational deaths. The majority of the lift skiers were killed while skiing out of bounds or in closed sections of the ski area. 100,000 avalanches occur each year in the United States.


When looking at avalanche fatalities, one cannot overstate the importance of the human element. In fact, 90% of the time, avalanche victims are killed in avalanches that they themselves trigger.  In other words, the avalanche would not have occurred if they had not been on the slope at that moment. 


Finally, statistics say that 61% of all avalanche deaths occur during the months of January, February and March. 


Over the next few weeks the MRA Blog will go deeper into the science behind what has been appropriately called "White Death." 

For more information on avalanche safety check out the Mountain Rescue Associations public education program @ http://mra.org/images/stories/training/Avalanche.pdf as well as our Backcountry Skiing & Riding Safety Video  

Courage - Commitment - Compassion
     Mountain Rescue Association