A snow cave is a shelter constructed from snow by certain animals in the wild, human mountain climbers, winter recreational enthusiasts, and winter survivalists. It has thermal properties similar to an igloo and is particularly effective at providing protection from wind as well as low temperatures. A properly made snow cave can be 0 °C (32 °F) or warmer inside, even when outside temperatures are −40 °C (−40 °F). [1] [2]
A snow cave is constructed by excavating snow so that the tunnel entrance is below the main space to retain warm air. Construction is simplified by building it on a steep slope and digging slightly upwards and horizontally into the slope. The roof is domed to prevent dripping on the occupants. Adequate snow depth, free of rocks and ice, is needed —generally, a depth of 4 to 5 feet (1.2 to 1.5 m) is sufficient. When constructing a snow cave is it common to build it in a large snow drift formed behind a ridge line, as this often offers a large heap of snow, and also protects the entrance of the snow cave from the prevailing wind. It is helpful to start digging a snow cave a bit up in the slope, as this allows easy disposal of the large volume of snow dug out when creating the cave. Another kind of snow cave is the quinzhee, which is constructed of piled and packed snow rather than created by digging a hole out of (or displacing) snow.
A narrow entrance tunnel, a little wider than the occupants of the cave, leads into the main chamber which consists of a flat area, perhaps with elevated sleeping platforms, also excavated from snow. Most sources agree that using tools such as a strong plastic or metal shovel, and maybe ice axe, is vital; digging by hand is for emergencies only. [2] Digging a snow cave can be physically demanding. In perfect conditions with good snow, digging a snow cave for two or three persons often takes three to four hours to complete. It can be useful to take turns in a group of climbers such that each person works in five-minute intervals inside the cave, while the others help remove excess snow outside the cave and prepare food and warm liquids for the group.
Regardless of construction type, the snow must be consolidated so that it retains its structure. The walls and roof should be at least 1 foot (0.30 m) thick. A length-wise pit may be dug deeper into the cave floor to provide a place for the coldest air to gather, away from the occupants. the cave entrance may be closed up with chunks of snow to deflect wind and retain heat, although it is vital to prevent drifting snow from completely plugging the rest of the entrance in order to maintain a constant air supply. Some prefer to place a ski pole or a ski up from the cave out through the roof or side wall. This can provide an emergency air hole should the main entrance become blocked. Skis can also be placed to cover the entrance or used to secure blocks of snow at the entrance. A snow shovel should always be kept inside the cave when participants are inside.
It is possible to sleep several consecutive nights in a snow cave, but care must be taken since a slight ice crust may develop on the inside of the cave from moisture in the exhaled air of the inhabitants. This is thought to result in reduced air ventilation through the snow cave walls and roof, and thus increase the risk of suffocation. As a precaution, it is common to scrape off a thin layer from the inside of the cave ceiling each night spent in the cave.
Mountaineering, mountain climbing, or alpinism is a set of outdoor activities that involves ascending mountains. Mountaineering-related activities include traditional outdoor climbing, skiing, and traversing via ferratas that have become sports in their own right. Indoor climbing, sport climbing, and bouldering are also considered variants of mountaineering by some, but are part of a wide group of mountain sports.
Snow comprises individual ice crystals that grow while suspended in the atmosphere—usually within clouds—and then fall, accumulating on the ground where they undergo further changes. It consists of frozen crystalline water throughout its life cycle, starting when, under suitable conditions, the ice crystals form in the atmosphere, increase to millimeter size, precipitate and accumulate on surfaces, then metamorphose in place, and ultimately melt, slide or sublimate away.
An avalanche is a rapid flow of snow down a slope, such as a hill or mountain.
An igloo, also known as a snow house or snow hut, is a type of shelter built of suitable snow.
A winter storm is an event in which wind coincides with varieties of precipitation that only occur at freezing temperatures, such as snow, mixed snow and rain, or freezing rain. In temperate continental climates, these storms are not necessarily restricted to the winter season, but may occur in the late autumn and early spring as well. A snowstorm with strong winds and other conditions meeting certain criteria is called a blizzard.
A crampon is a traction device attached to footwear to improve mobility on snow and ice during ice climbing. Besides ice climbing, crampons are also used for secure travel on snow and ice, such as crossing glaciers, snowfields and icefields, ascending snow slopes, and scaling ice-covered rock.
Ski mountaineering is a skiing discipline that involves climbing mountains either on skis or carrying them, depending on the steepness of the ascent, and then descending on skis. There are two major categories of equipment used, free-heel Telemark skis and skis based on Alpine skis, where the heel is free for ascents, but is fixed during descent. The discipline may be practiced recreationally or as a competitive sport.
Backpacking is the outdoor recreation of carrying gear on one's back while hiking for more than a day. It is often an extended journey and may involve camping outdoors. In North America, tenting is common, where simple shelters and mountain huts, widely found in Europe, are rare. In New Zealand, hiking is called tramping, and tents are used alongside a nationwide network of huts. Hill walking is equivalent in Britain, though backpackers make use of a variety of accommodation, in addition to camping. Backpackers use simple huts in South Africa. Trekking and bushwalking are other words used to describe such multi-day trips.
Mount Timpanogos, often referred to as Timp, is the second-highest mountain in Utah's Wasatch Range. Timpanogos rises to an elevation of 11,752 ft (3,582 m) above sea level in the Uinta-Wasatch-Cache National Forest. With 5,270 ft (1,610 m) of topographic prominence, Timpanogos is the 47th-most prominent mountain in the contiguous United States.
A dugout or dug-out, also known as a pit-house or earth lodge, is a shelter for humans or domesticated animals and livestock based on a hole or depression dug into the ground. Dugouts can be fully recessed into the earth, with a flat roof covered by ground, or dug into a hillside. They can also be semi-recessed, with a constructed wood or sod roof standing out. These structures are one of the most ancient types of human housing known to archaeologists, and the same methods have evolved into modern "earth shelter" technology.
A snow fort or snow castle is a usually open-topped temporary structure made of snow walls that is usually used for recreational purposes. Snow forts are generally built by children as a playground game or winter pastime and are used as defensive structures in snowball fights. They are also built and used for make-believe games such as "house", "store", or "community", a game where multiple forts are built in a group. Along with the snowman, it is one of the two structures commonly built by children out of snow.
The Eisriesenwelt is a natural limestone and ice cave located in Werfen, Austria, about 40 km south of Salzburg. The cave is inside the Hochkogel mountain in the Tennengebirge section of the Alps. It is the largest ice cave in the world, extending more than 42 km and visited by about 200,000 tourists every year.
A yaodong is a particular form of earth shelter dwelling common in the Loess Plateau in China's north. They are generally carved out of a hillside or excavated horizontally from a central "sunken courtyard".
A quinzhee or quinzee is a Canadian snow shelter made from a large pile of loose snow that is shaped, then hollowed. This is in contrast to an igloo, which is built up from blocks of hard snow, and a snow cave, constructed by digging into the snow. The word is of Athabaskan origin and entered the English language by 1984. A quinzhee can be made for winter camping and survival purposes, or for fun.
Mount Hood climbing accidents are incidents related to mountain climbing or hiking on Oregon's Mount Hood. As of 2007, about 10,000 people attempt to climb the mountain each year. As of May 2002, more than 130 people are known to have died climbing Mount Hood since records have been kept. One of the worst climbing accidents occurred in 1986, when seven high school students and two teachers froze to death while attempting to retreat from a storm.
Avalanche control or avalanche defense activities reduce the hazard avalanches pose to human life, activity, and property. Avalanche control begins with a risk assessment conducted by surveying for potential avalanche terrain by identifying geographic features such as vegetation patterns, drainages, and seasonal snow distribution that are indicative of avalanches. From the identified avalanche risks, the hazard is assessed by identifying threatened human geographic features such as roads, ski-hills, and buildings. Avalanche control programs address the avalanche hazard by formulating prevention and mitigation plans, which are then executed during the winter season. The prevention and mitigation plans combine extensive snow pack observation with three major groups of interventions: active, passive and social - sometimes more narrowly defined as "explosive", "structural", and "awareness" according to the most prevalent technique used in each. Avalanche control techniques either directly intervene in the evolution of the snow pack, or lessen the effect of an avalanche once it has occurred. For the event of human involvement, avalanche control organizations develop and train exhaustive response and recovery plans.
Classifications of snow describe and categorize the attributes of snow-generating weather events, including the individual crystals both in the air and on the ground, and the deposited snow pack as it changes over time. Snow can be classified by describing the weather event that is producing it, the shape of its ice crystals or flakes, how it collects on the ground, and thereafter how it changes form and composition. Depending on the status of the snow in the air or on the ground, a different classification applies.
BoomingIceChasm is an ice cave, located in the Crowsnest Pass area of the Rocky Mountains in Alberta, Canada.
An ice dam is an ice build-up on the eaves of sloped roofs of heated buildings that results from melting snow under a snow pack reaching the eave and freezing there. Freezing at the eave impedes the drainage of meltwater, which adds to the ice dam and causes backup of the meltwater, which may cause water leakage into the roof and consequent damage to the building and its contents if the water leaks through the roof.
Digging, also referred to as excavation, is the process of using some implement such as claws, hands, manual tools or heavy equipment, to remove material from a solid surface, usually soil, sand or rock on the surface of Earth. Digging is actually the combination of two processes, the first being the breaking or cutting of the surface, and the second being the removal and relocation of the material found there. In a simple digging situation, this may be accomplished in a single motion, with the digging implement being used to break the surface and immediately fling the material away from the hole or other structure being dug.