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Avalanche

How To Avoid And Survive An Avalanche

How To Avoid And Survive An Avalanche

Whilst skiing off piste is exhilarating, the serious downside is the risk of an avalanche or snow slide. Knowing how to spot areas that at are risk, recognise when one is coming and how to deal with one if you are caught up in it, is vital. And if you are one of the first to arrive upon the scene of an avalanche, knowing what to do may help save peopleís lives - no small feat.

Itís also important to make sure you have the right travel insurance coverage for skiing off piste, as the costs of medical evacuation will be so much higher. Off piste skiing with a guide is included in our Winter Sports policies. If you plan on skiing off piste without a guide you will also need to add Sports Grade 4.

What Are Avalanches?

An Avalanche is a slide of snow that can start from one point, gathering speed and volume as it goes. The mass will contain not only snow, but also air and possibly ice, trees, rocks and other debris or objects that come into its path. They are frightening and extremely dangerous. Some avalanches have been known to reach speeds of up to 175 miles an hour.

They are often spontaneously caused in storms that produce a lot of snowfall which causes an increased load, but they can also be triggered by changes in the snowpack such as melting, rain, rockfall, not to mention skiers and snowboarders themselves. In fact the majority of avalanches in a recreational setting (i.e. resorts as opposed to residential areas) tend to have been caused by the people who were actually involved in the avalanche.

Avalanche Formation Temperature change in the layers of snow can cause an avalanche

You can see an example of a skier setting off an avalanche here:

How To Avoid An Avalanche

1. Take An Avalanche Safety Course

Neil Reed, Communications Officer at the Mountaineering Council of Scotland, suggests that prevention is the best cause and counsels embarking on an avalanche course.

An avalanche safety course will equip you with the skills to be able to assess terrain, and use tools to measure slopes that are questionable. You will also spot signs of avalanches in the past which can alert you to a high avalanche risk area.

Courses will teach you things to avoid such getting too close to cornices or asses the following as pointed out by Neil:

  • Adjacent layers of different hardness
  • Very soft layers (your fist penetrates easily)
  • Water drops squeezed out of a snowball made from any layer
  • Layers of ice
  • Layers of graupel (rounded, heavily rimed pellets) - these act like a layer of ball-bearings in the snowpack
  • Feathery or faceted crystals
  • Layers of loose, incohesive grains
  • Air space

Any of these can hint at weaknesses in the snowpack.

Avalanche Type Different types of avalanches

2. Use Local Knowledge

Skiing with a local is the best way to tap into local knowledge of safe and not so safe areas. But youíll gain a whole lot more from the experience and theyíll take you to places youíd be hard pushed to find on your own.

"At times of high avalanche risk, a north-facing gully might be highly dangerous while a south facing one is safe, and ridges generally tend to be safer than gullies. In short, even with forecasts, you require a fair bit of experience."

If you are not skiing with a local, ask around for suggested places to avoid before you hit the slopes, and do your research via the net before you even arrive.

On the day, check weather conditions and the avalanche forecast for the rest of the day. But do be aware that mountain conditions are difficult to predict. Neil Reed cautions:

ďA word of info about the avalanche forecasts: they have been cited by media articles where reporters are clearly under the impression that a forecast of Ďconsiderableí avalanche risk applies generally, when in fact this is not the case. Avalanche forecasts require interpretation with respect to weather and terrain. For instance, at times of high avalanche risk, a north-facing gully might be highly dangerous while a south facing one is safe, and ridges generally tend to be safer than gullies. In short, even with forecasts, you require a fair bit of experience.Ē

Surviving An Avalanche

There are three main ways you can get injured or die in an avalanche - from injury during the avalanche itself, hypothermia due to the cold or suffocation because of lack of air. Once buried, evidence points that you have about eighteen minutes. This is because in packed snow you will end up breathing in your own air, and therefore suffer carbon dioxide poisoning. Even if you can reach oxygen outside, you may still succumb to hypothermia or shock so knowing what to do is important.

Dangerous Avalanches The three fatalities once buried are injury from the avalanche itself, hypothermia or lack of oxygen

If you can sense or see an avalanche about to happen:

  • If you have set one off yourself and can actually see the fracture line in the snow, try jumping above that so that you are not caught up in it
  • Drop any equipment / bags that could slow you down (but not your avalanche gear)
  • Call out to alert anyone nearby but then keep your mouth tightly closed to avoid snow entering
  • If you are near a tree, grab onto it tightly. This may prevent you from being dragged off, but do be aware that very strong avalanches can take trees with them
  • Move to the side of the avalanche as fast as possible - run, ski, board your way out of its path

If you get caught in an avalanche:

  • If you feel yourself being dragged under try to drop something that can perhaps help searchers pinpoint the area you may be in
  • If you are being dragged under, adopt a swimming motion to try to pull yourself to the surface
  • If you can raise one arm through the snow to the surface it may help searchers find you
  • Itís important you try to get yourself out and up into oxygen as soon as possible. If you don't know which way to dig, spit and gravity will show you which way is down!
  • Dig out an air pocket near your nose and mouth as the avalanche slows.
  • Again, just before the snow settles take a breath as big as you can and really expand your lungs and chest which will give you a tiny bit of extra breathing room when the snow hardens and make breathing easier once the snow settles
Avalanche Survival Tips Raise an arm so searches can find you and take a big breath before the snow hardens around your body

Once the show has stopped moving do try to move if you can, and dig towards the surface. However, if you feel you are deep you are better off trying to conserve your air. Call out if you hear people but don't waste your air supply if you canít hear anyone yet.

"The important thing is not to panic and wait: if you have your avalanche gear, people should find you"

Some skiers suggest urinating in the snow which can help rescue dogs to find you through the scent but the important thing is not to panic (this will use up more of your precious air) and wait: if you have your avalanche gear, people should find you.

If you really are in a remote spot and know people are unlikely to get to you quickly, you will just have to dig yourself out as quickly as possible before the cold and lack of air kicks in.

You can see a video of someone caught in an avalanche here, where the participants talk about the mistakes they made:

Whatís In An Avalanche Kit?

You don't have to carry a lot of expensive, heavy equipment to give you a better chance of getting out of an avalanche, but experts do recommend:

Transceiver

A transceiver or beacon which sends a signal that alerts searchers to where you are buried. They can be analogue (a sound plus light) or digital (electromagnetic signal). Interestingly, the new digital transceiver donít identify victims so the rescuers have no moral deliberation about who to save. Digital beacons are said to be easier to use, although analogue have a longer range.

Knowing both how to activate your transceiver as well as use it to find victims is vital before you hit the slopes so it is important to practise or even take a course. There is a location in Scotland specifically designed for people to practise learning how to use transceivers at http://www.glenmorelodge.org.uk.

They all use the same frequency so it doesnít matter what brand you are using.

You wear your transceivers in a special harness or strap over your body - against your chest and under your jacket. Obviously it needs to be on and transmitting to be of any use!

Probes

These are basically long poles that can be fixed together to become even longer and these can help locate someone under the snow and show everyone where to dig. They can also measure the depth that people are buried at - vital as youíll need to know how wide a hole to make at the same time.

When buying a pole, the longer it is the better. These are often made of smaller sections of probe that attach together for easier transporting, and come in a choice of aluminium or carbon. Aluminium is heavier and can work better in dense snow, whereas carbon probes are lighter to carry around. Just like a transceiver, practise getting your probe out of the bag and putting it probes together - if you ever need to use it, speed will be vital.

Snow Shovel

"Plastic shovels are lighter, but aluminium shovels are stronger, choose one that suits you"

A shovel will help you to uncover trapped victims. Plastic shovels are lighter, but aluminium shovels are stronger and will help you shovel snow much faster. Choose one that suits you. If youíre small you want a shovel you can use easily, not something you will have trouble wielding. Your shovel also needs to fit neatly into your backpack, along with your other equipment.

Your Ski Helmet

Yet another reason to wear a helmet is that an avalanche will knock its victims over with force and maybe even propel them into a rock or tree. Trauma from an avalanche can be just a deadly as getting buried, so a helmet will be of great help here.

Skiers Air Bag

If you feel yourself being dragged under a skier's air bag will inflate and can help keep your body towards the slopeís surface and therefore less likely to get buried. They may also protect your body a little from physical trauma.They are relatively new items of equipment but gaining in popularity.

Once activated, the airbags take about 3-5 seconds to inflate. They use the process of inverse segregation to help keep you up i.e. items of a higher volume will rise to the surface when agitated. It is this increased volume that helps a skier rise upwards. You can see the process in action here:

AvaLung

We have mentioned the grim statistic that you will have around eighteen minutes before you start suffocating. The AvaLung lowers the likelihood of suffocation, taking the air from the snowpack through a mouthpiece, and diverting your carbon dioxide-rich breath to the snow behind you so you don't re-inhale it. Itís basically an artificial lung and will increase the time you have before you start to suffocate, possibly up to an hour, as long as you have got the mouthpiece into your own mouth in time. Once again, itís important to practise, perhaps whilst running, so this becomes second nature to you.

What To Do If You Arrive At The Scene Of An Avalanche?

If youíve seen the avalanche happen from a distance, do your best to watch people and track their progress. This sort of information could be vital in finding them later, but make sure you donít go anywhere near the slope until the avalanche has completely stopped.

Once you are there:

  • Scan the surface, looking for anything that can help locate people trapped beneath - a hand, ski, pole
  • Switch your transceiver to receive mode to receive any signals from trapped victims
  • If you do get a signal keep walking towards the spot where the signal is the strongest
  • Call out to them and then listen for their reply, although bear in mind they could be trapped too far below the surface for you to hear
  • If there are a number of victims, concentrate on those nearer the surface at first, who have higher chance of survival
  • Probe around to see if you can locate the victim
  • Mark their location with a probe, branch or something else
  • Be aware that you will need to build a hole as wide as the victim is deep. Call for help if you are sure they are there. Throw snow downhill. If you don't have a shovel use your skis or board to move snow.

As soon as you see the victim, uncover their head and chest and begin CPR if necessary. If the victim cannot move on their own, do not attempt to move them until medical help arrives. If you do arrive on a scene, and the victim has an AvaLung, it is still imperative to get them as quickly as possible.

Contributor: Neil Reed

Advice from Neil Reed

Neil Reed is the communications officer for The Mountaineering Council of Scotland and has been walking and climbing in the Scottish Hills for over 45 years. The council runs courses on avalanche safety and you can find out more.