Alaska-Yukon Expedition: Spring Conditions Terminology
In talking recently with my parents and friends I gather that not everyone is familiar with the lingo I've been using to describe the current springtime conditions. I'll attempt to define a few of the most important terms now.
"Variable conditions"
In the winter and summer, conditions are relatively predictable. Winter: cold temps, dry snow, frozen rivers and lakes, full snow coverage. Summer: warm, wet, open rivers and lakes, no snow. But in the spring, conditions are something in between, and changes are happening rapidly in the transition from winter to summer. A slope may be covered in snow today, but bare next week. A river that had frequent ice bridges yesterday may be completely open tomorrow. The snow may feature a supportive crust at 8 a.m. but might be the consistency of a slushie by noon.
"Posthole"
An unpleasant experience by which one sinks through the snowpack, potentially to the ground, because the snow is not supportive enough for the pressure being placed upon it. Postholing is especially common in the spring when a "hiker" attempts to walk across snow without using any floatation (e.g. skis or snowshoes). But in Interior Alaska, postholing can happen even with skis, snowshoes, or a snowmachine because the snow here is especially unsupportive in the Spring.
"Rotten snow"
The wintertime snowpack in Interior Alaska has very little water content. It rarely contains a sun- or warmth-caused layer. And it's a shallow snowpack, consisting mostly of incoherent faceted snow crystals caused by a high temperature gradient between the ground and the air temperature. The snowpack is fluffier than Colorado's, and at the other end of the spectrum from California's sticky and wet snow. When it begins to melt in the Spring, it actually just "rots." The days get so long that it's in a near constant state of melting, and the snowpack is so porous that it can't consolidate and settle. If you get lucky there'll be a freeze crust on the surface in the morning, but the crust is often very thin (it's like skiing on egg shells) and it's supported by nothing underneath so postholing almost always ensues. Rotten snow has the consistency of a slushie.
"Crust"
The snowpack can obtain a surface crust due to wind, snow, or a freeze-thaw cycle. This is very desriable because it provides a supportive layer on which to travel, often at a relatively fast rate of speed since the traveler is not punching through. In Alaska, I've often found wind crusts in alpine areas and I occasionally find melt crusts on sunny snow-covered slopes early in the morning (but not once the sun has warmed it up again). Crusts are mostly non-existent in the timber or in the brush.
"Settling" or "whoomping"
Interior Alaska's snowpack is usually weak and unstable due to its faceted snow grains. On hundreds of occasions I have heard the snowpack settle beneath me (accompanied by a loud "whoomp") as snowpack's surface collapses atop the weak faceted foundation. In particularly unstable locations I can see the snow surface settle hundreds of feet away from me, creating a visual effect like how an earthquake is depicted in movies.
Go Further
Animals
- These 'trash fish' are among Earth's most primitive animalsThese 'trash fish' are among Earth's most primitive animals
- These photos are works of art—and the artists are bugsThese photos are works of art—and the artists are bugs
- The epic migration of a 6-foot long, 200-pound catfishThe epic migration of a 6-foot long, 200-pound catfish
- Frans de Waal, biologist who studied animal emotion, dies at 75Frans de Waal, biologist who studied animal emotion, dies at 75
Environment
- Are synthetic diamonds really better for the planet? The answer isn't clear-cut.Are synthetic diamonds really better for the planet? The answer isn't clear-cut.
- This year's cherry blossom peak bloom was a warning signThis year's cherry blossom peak bloom was a warning sign
- The U.S. just announced an asbestos ban. What took so long?The U.S. just announced an asbestos ban. What took so long?
- The most dangerous job? Inside the world of underwater weldersThe most dangerous job? Inside the world of underwater welders
- The harrowing flight that wild whooping cranes make to surviveThe harrowing flight that wild whooping cranes make to survive
History & Culture
- Meet the powerful yokai that inspired the demon king in ‘Demon Slayer’Meet the powerful yokai that inspired the demon king in ‘Demon Slayer’
- A surprising must-wear for European monarchs? Weasels.A surprising must-wear for European monarchs? Weasels.
- Meet the woman who made Polaroid into a cultural iconMeet the woman who made Polaroid into a cultural icon
- Inside the observatory that birthed modern astrophysicsInside the observatory that birthed modern astrophysics
Science
- LED light treatments for skin are trendy—but do they actually work?LED light treatments for skin are trendy—but do they actually work?
- NASA smashed an asteroid. The debris could hit Mars.NASA smashed an asteroid. The debris could hit Mars.
- Humans really can have superpowers—scientists are studying themHumans really can have superpowers—scientists are studying them
- Why engineers are concerned about aging infrastructureWhy engineers are concerned about aging infrastructure
Travel
- 2024 will be huge for astrotourism—here’s how to plan your trip2024 will be huge for astrotourism—here’s how to plan your trip
- Play and stay in the mountains of eastern Nevada
- Paid Content
Play and stay in the mountains of eastern Nevada - This couple quit the city to grow wasabi in Japan's mountainsThis couple quit the city to grow wasabi in Japan's mountains