March 2026 Sunriver Scene - Flipbook - Page 12
More than frozen water: The science, language and life of snow
PHOTO COURTESY GEORGE LEPP
This fully formed snow昀氀ake and a smaller, developing crystal
were captured on a black cloth glove. The background has been
hand-erased in Photoshop.
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By Kelli Anderson,
SNCO Staff
Snow is a blanket term for
the frozen form of atmospheric
water that falls from clouds.
It can be both a noun and
a verb. It may arrive light and
powdery or dense and wet.
Within this seemingly simple
word exists a remarkable diversity, both in the tiny crystals
drifting down from the sky
and in the layered snowpacks
that form once it reaches the
ground.
There is a popular idea that
Indigenous peoples in northern climates have hundreds of
words for snow. While often
repeated, this claim is oversimplified.
Many Indigenous languages
build meaning by combining
root terms and often emphasize what snow does rather
than what it is. Rather than
hundreds of unrelated dictionary entries, these languages
contain families of words that
describe snow’s state, behavior
and usefulness. English does
something similar, using a
rich vocabulary to distinguish
what might otherwise seem
like nothing more than frozen
water.
At the molecular level, the
structure of snow is rooted in
the chemistry of water itself.
Water molecules bond in a way
that naturally forms a six-sided
pattern. When water freezes
into ice, it creates hexagonal
symmetry, a structure dictated
by hydrogen’s directional attraction.
A snowflake begins as a tiny
hexagonal prism when water
vapor freezes around a microscopic particle known as an ice
nucleus. These nuclei can be
mineral dust, pollen, sea salt,
volcanic ash or even bacteria.
In fact, some bacteria actively
promote ice formation, helping
clouds produce snow. Because
of this, snow is not just frozen
water. It is also a slow-release
delivery system, transporting
atmospheric materials into
soils, streams, and ecosystems
as it melts.
As a snowflake falls through
a cloud, it is constantly changing temperatures and humidity.
Because all six sides experience
nearly identical conditions,
they tend to grow at similar
rates. Still, no two snowflakes
follow the same path. Tiny
variations, slight temperature shifts, collisions or subtle
changes in moisture, shape
each crystal as it grows, making every snowflake unique
despite their shared hexagonal
symmetry.
Even with this intrinsic
uniqueness, classifying snow
is essential for understanding
how it behaves and how we
interact with it. Meteorologists
use the term “snow events” to
describe the conditions that
produce snowfall.
A blizzard, for example, is defined by sustained or frequent
winds of 35 miles per hour or
more, combined with falling
or blowing snow that reduces
visibility for at least three hours.
A snow flurry, by contrast,
is a brief and light snowfall
with little to no accumulation.
Frozen precipitation also comes
in many forms, including snow
grains, snow pellets, ice crystals
and hail. Snowfall intensity,
light, moderate or heavy, is
classified largely by visibility
during the event.
Once snow reaches the
ground, its story becomes
even more complex. Snowpack
behavior depends on crystal
structure, how snow was deposited and surface conditions
shaped by wind and sunlight.
Features such as a “crust,”
a surface layer stronger than
the snow beneath it, can dramatically affect travel, wildlife
movement, and safety. A crust
may be supportive or breakable, changing both efficiency
and risk. Wind and sun further
sculpt the snowpack. A “wind
crust” forms on windward
slopes and often bonds tightly
with surrounding layers, while
“wind slabs” accumulate on
leeward slopes and can be less
stable. These distinctions are
critical for understanding avalanche risk.
Recreation adds yet another layer of snow vocabulary,
shaped by terrain and elevation. High-altitude landscapes,
where snow persists longest,
develop distinctive snowpacks.
Take our backyard ski hill, Mt.
Bachelor, for example. A relatively young mountain has the
classic symmetrical shape of a
cinder cone volcano. Rising
alone and isolated from the
clustered peaks of the Cascade
Mountain Range, Mt. Bachelor
experiences unique weather
patterns that strongly influence
its snowpack and surrounding
ecosystems. This dynamic system, formed by the interplay of
atmosphere, geology, and snow,
is also heavily traveled, hosting
thousands of winter recreationists each year.
Turn to Snow, page 13
Page 12
MARCH 2026 SUNRIVER SCENE
