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Avalanche bulletin

WED 01st FEB 2023
High reliability
Issue date: 01 FEB 2023 at 07:58

Weather forecasts and field observations are reliable

ALPINE
Livigno valore bollettino valanghe
TREELINE
Livigno valore bollettino valanghe
BELOW TREELINE
Livigno valore bollettino valanghe
Livigno icona pericolo forte
5
VERY HIGH
CONSEQUENCES FOR PERSONS OUTSIDE SECURED ZONES
Highly unfavourable conditions. Avoid open terrai.
SNOWPACK STABILITY
The snowpack is poorly bonded and largely unstable in general.
AVALANCHE TRIGGERING PROBABILITY
Numerous very large and often extremely large natural avalanches can be expected, even in moderately steep terrain*.
Livigno icona pericolo forte
4
HIGH
CONSEQUENCES FOR PERSONS OUTSIDE SECURED ZONES
Unfavourable conditions.Extensive experience in the assessment of avalanche danger is required. Remain in moderately steep terrain / heed avalanche run out zones
SNOWPACK STABILITY
The snowpack is poorly bonded on most steep slopes*.
AVALANCHE TRIGGERING PROBABILITY
Triggering is likely, even from low additional loads**, on many steep slopes*. In some cases, numerous large and often very large natural avalanches can be expected.
Livigno icona pericolo marcato
3
CONSIDERABLE
CONSEQUENCES FOR PERSONS OUTSIDE SECURED ZONES
Partially unfavourable conditions.Experience in the assessment of avalanche danger is required. Steep slopes of indicated aspects and altitude zones should be avoided if possible
SNOWPACK STABILITY
The snowpack is moderately to poorly bonded on many steep slopes*.
AVALANCHE TRIGGERING PROBABILITY
Triggering is possible, even from low additional loads**, particularly on the indicated steep slopes*. In certain situations some large, and in isolated cases very large natural avalanches are possible.
Livigno icona pericolo moderato
2
MODERATE
CONSEQUENCES FOR PERSONS OUTSIDE SECURED ZONES
Mostly favourable conditions. Careful route selection, especially on steep slopes of indicated aspects and altitude zones.
SNOWPACK STABILITY
The snowpack is only moderately well bonded on some steep slopes*; otherwise well bonded in general.
AVALANCHE TRIGGERING PROBABILITY
Triggering is possible, primarily from high additional loads**, particularly on the indicated steep slopes*. Very large natural avalanches are unlikely
Livigno icona pericolo debole
1
LOW
CONSEQUENCES FOR PERSONS OUTSIDE SECURED ZONES
Generally safe conditions.
SNOWPACK STABILITY
The snowpack is well bonded and stable in general.
AVALANCHE TRIGGERING PROBABILITY
Triggering is generally possible only from high additional loads** in isolated areas of very steep, extreme terrain*. Only small and medium natural avalanches are possible.

* The avalanche-prone locations are described in greater detail in the avalanche bulletin (altitude, slope aspect, type of terrain).
• moderately steep terrain: slopes shallower than about 30 degrees
• steep slopes: slopes steeper than about 30 degrees
• very steep, extreme terrain: particularly adverse terrain related to slope angle (more than about 40 degrees), terrain profile, proximity to ridge, smoothness of underlying ground surface

** Additional loads:
• low: individual skier / snowboarder, riding softly, not falling; snowshoer; group with good spacing (minimum 10m) keeping distances
• high: two or more skiers / snowboarders etc. without good spacing (or without intervals); snowmachine; explosives
natural: without human influence

MAIN PROBLEM 1: WIND SLAB
Livigno WIND SLAB

Slab avalanches from wind

ALTITUDE
Livigno ALTITUDE
EXPOSURE
image white Livigno EXPOSURE Livigno EXPOSURE Livigno EXPOSURE Livigno EXPOSURE Livigno EXPOSURE
LIKELIHOOD
Livigno LIKELIHOOD
AV. SIZE
TREND
Livigno TREND
SLAB AVALANCHES FROM WIND

MAIN PROBLEM 2: PERSISTENT WEAK LAYER
Livigno PERSISTENT WEAK LAYER

Slab avalanches

ALTITUDE
Livigno ALTITUDE
EXPOSURE
Livigno white Livigno EXPOSURE Livigno EXPOSURE Livigno EXPOSURE Livigno EXPOSURE Livigno EXPOSURE Livigno EXPOSURE Livigno EXPOSURE Livigno EXPOSURE
LIKELIHOOD
Livigno LIKELIHOOD
AV. SIZE
TREND
Livigno TREND
SLAB AVALANCHES
DANGER DESCRIPTION
Above the treeline, medium-sized unstable wind slabs have formed, these stand on persistent weak layers and can easily generate a slab avalanche; in isolated cases remote triggering is possible. Locally, avalanches can involve the weak layers even deeper and increase in size. Danger points increase on southern and eastern slopes.
TRAVEL AND TERRAIN ADVICE
The wind slabs should be avoided. Danger points are linked to the presence of a superficial slab; approach steep slopes, passages from thin to thick snowpack, and slopes change with extreme caution. Whumpfing sounds and shooting cracks are clear danger signs.
SNOW COVER CHARACTERISTICS
Above the treeline the snowpack is strongly wind-affected and ridges are eroded with wind-blown snow accumulations behind slopes change; these stand on a snowpack characterized by the presence of persistent layers weak alternating with melt-freeze crust on sunny slopes. Below the treeline the thickness of the snowpack is poor and is composed by dry-loose snow; on the southern slopes, on the surface, there is a non-bearing melt-freeze crust.
REGIONAL AVALANCHE DANGER LEVEL: 2
WEATHER
Variable cloudiness with North-Westerly strong/moderate foehn-winds in alpine, even with very strong gusts.
Weather data data at 07:00 01-02-2023ValleyAltitude
Snow height 37 cm 59 cm
New snow 0 cm 0 cm
Air temperature min/max -13,1/3 °C -12,3/-6,8 °C
Wind: speed ava/max   40/125,5 Km/h
Wind direction   NW


For snow stability feedbacks, avalanche reports or additional info on the avalanche bulletin, write to freeride@livigno.eu

NOTE:
This bulletin applies to all sports/recreational activities taking place in the district of the municipality of Livigno. Regional information on avalanche danger can be found at: https://www.slf.ch/en/avalanche-bulletin-and-snow-situation.html#avalanchedanger
The local avalanche bulletin and other information provided by APT Livigno, the Town of Livigno and ALPsolut Ltd, are limited to personal use and are for recreational purposes only.
This information is provided "as is" and the authors cannot be held responsible for possible damages resulting from discomfort, injury, death, claims by third parties and other coincidental causes or consequential damages arising from the use of such information.
The recipient of the information contained therein acknowledges that natural phenomena such as avalanches cannot be accurately predicted and any usage of the data must fully take this into consideration.The accuracy and reliability of the data is therefore not guaranteed and the providers of this service disclaim all liability of any kind, take no responsibility for the quality of services, the impossibility of its usage, its marketability, nor any possible misuse thereof.The predicted level of danger of the avalanche is in accordance with the European Avalanche Danger scale ( https://www.avalanches.org/standards/avalanche-danger-scale/). The icons used to describe the typical avalanche problems are consistent with those specified by the European Avalanche Warning Services (https://www.avalanches.org/standards/avalanche-problems/).

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