49
48
I n t r o d u c t i o n t o Ava l a n c h e T h e o r y
8.3.2 Minimize Stress on the Snowpack
Adequate spacing is an effective method to minimize
stress on the snowpack. Ascending, the spacing
should be approximately 10 meters; descending
approximately 30 – 50 meters, due to the additional
stress. Danger zones should be traveled one person
at a time. Minimize the stress on the snowpack by
making long turns. Avoid jumping!
8.3.3 Renunciation in the Terrain
(Basic Reduction Method, W. Munter)
Danger Level
Skiable/ridable slope angle
2-Moderate
less than 40 degrees
3-Considerable
less than 35 degrees
4-High
less than 30 degrees
●
Untracked steep slopes (> 30 degrees):
➜
spacing of at least 10 m.
●
Outside of the forecasted aspect or altitude
ranges:
➜
the danger level is generally one level lower.
●
At the edge of the forecasted aspect or altitude
ranges:
➜
Do not approach the limits
8.4
Avalanche Forecast Centers
It is impossible to publish a list of all the avalanche
forecast centers in this user manual.
Current information about all the avalanche forecast
centers worldwide can be found at the CyberSpace
Avalanche Center website at http://www.csac.org
Example:
black
= Considerable
→
white
≈
M
oderate
0
0
8
1
m
N
3
8.5
International Avalanche Danger Scale
Danger Level
Snowpack
Typical Indications
Tours
쐃
Snowpack
None.
Generally favorable
LOW
generally well
conditions.
bonded.
쐇
On some steep
Difficult
Generally favorable conditions.
MODERATE
slopes snowpack
to recognize.
Careful choice of route on steep
only moderately
slopes of aspect and altitude
bonded.
No alarm signals.
as given in the avalanche forecast.
쐋
On many steep
«Whumphing» noises.
Partly unfavorable conditions.
CONSIDER-
slopes medium
Some spontaneous ava-
Experience in assessing avalanche
ABLE
to poor snowpack.
lanches. Remote triggering
risk required. Wherever possible avoid
bonding only.
at the foot of slopes.
steep slopes of aspect and altitude
as given in the avalanche forecast.
쐏
Poor bonding
Spontaneous
Unfavorable conditions.
HIGH
of snowpack
avalanches.
Tours only in moderately steep
on most steep
Remote triggering.
terrain < 30 º. Be aware
slopes.
of avalanche runout zones.
쐄
Generally poor
Spontaneous avalanches
Very unfavorable conditions.
EXTREME
bonding of snowpack,
avalanches and remote
Refrain from tours.
mostly unstable.
triggering on a large scale.