Alpes du Sud
Ubaye
Day Risk Profile
Avalanche Problems
New snow + Persistent weak layers + No distinct problem
3
Field notes
New snow
Easy to spot - the snow is fresh. Look at recent avalanche activity in similar terrain, and pay attention to how much new snow has fallen in the last three days. Critical loading depends on temperature, wind, and what was on the surface before the storm. SLF advises waiting until the Snow deposited on the ground in a multiplicity of layers.EAWS glossary has had time to bond before committing to steep terrain in fresh snow.
Persistent weak layers
Persistent Snowpack layer in which the crystals are poorly bonded and the layer has the potential to fail. Typical crystals in dry weak layers causing avalanches are : precipitation particles; surface hoar; faceted crystals; hollow crystals; graupel. Generally >1mm in size, loose grains with few bonds Wet weak layers can be formed by all snow crystal/grain types.EAWS glossary are very challenging to recognise. Distinctive noise (resembling a “whumpf” sound) occurring when a weak layer beneath a slab collapses. The air of the weak layer is forced outside the snowpack, with the resulting whumpf sound being heard. The sound usually indicates an unstable situation and can be accompanied by surface cracking. A whumpf is a clear avalanche alert.EAWS glossary sounds and shooting cracks are typical when present, but you can have a serious weak layer with no warning signs at the surface. Knowledge of how the Snow deposited on the ground in a multiplicity of layers.EAWS glossary has evolved is essential. SLF's travel advice is direct: travel conservatively, avoid terrain where the consequences of being caught are large, and treat the history of weather and snow as more important than what you can see today. Read the full bulletin.
No distinct problem
SLF uses this label when no single problem dominates the assessment, often on lower-danger days. It doesn't mean conditions are safe: any avalanche type is still possible, and normal caution applies. On stable days this is usually a signal to enjoy the mountains with general awareness; on less-stable days where the assessment is still inconclusive, it's a signal to be cautious specifically because there's no clear pattern to follow.
Avalanche Activity
Au-dessus de 2000m indice de risque marqué, plus bas indice limité.
Jeudi, en journée, peu d’activité naturelle prévue avec le retour d’un temps quasi sec et le vent plus faible.
nombreuses plaques en place, possiblement présentes en toutes orientations et plus nombreuses au-dessus de 2000 m environ. Instabilités,
parfois d'Direction in which a slope faces as indicated by compass direction of the fall line; i.e. a north slope faces in a northerly direction.EAWS glossary poudreux, difficiles à identifier, mais faciles à déclencher par un skieur ou randonneur. Dans les versants ombragés (ouest, nord, est), le déclenchement et la
propagation sont favorisés par la présence d’une sous-couche composée de grains sans cohésion (couche fragile persistante). En cas de rupture, avalanche petite à moyenne,
notamment en zone de forte accumulation, dans les versant ombragés d'altitude. Sous 2000 m, le risque est plus limité.
Outlook
Decreasing avalanche danger
Snowpack & Weather
Snowpack
Situation avalancheuse typique
neige fraîche couche fragile persistante
Déclenchements provoqués : nombreuses plaques en place, possiblement présentes en toutes orientations et plus nombreuses au-dessus de 2000 m environ. Instabilités,
parfois d'Direction in which a slope faces as indicated by compass direction of the fall line; i.e. a north slope faces in a northerly direction.EAWS glossary poudreux, difficiles à identifier, mais faciles à déclencher par un skieur ou randonneur. Dans les versants ombragés (ouest, nord, est), le déclenchement et la
propagation sont favorisés par la présence d’une sous-couche composée de grains sans cohésion (couche fragile persistante). En cas de rupture, avalanche petite à moyenne,
notamment en zone de forte accumulation, dans les versant ombragés d'altitude. Sous 2000 m, le risque est plus limité.
Départs spontanés : Jeudi, en journée, peu d’activité naturelle prévue avec le retour d’un temps quasi sec et le vent plus faible.
Outlook
km/h 20 km/h 20 km/h
Tendance du vendredi 05 décembre
Indice de risque limité
sque en baisse. Quelques plaques
rsistantes en versants ombragés, petits
parts ponctuels en neige humide au soleil.