Persistent weak layers
- Above 2,200 m
- Size
- 3
Stability: fair · Frequency: few
Weakly bonded old snow and gliding snow require caution.
Stability: fair · Frequency: few
Stability: very poor · Frequency: few
Stability: poor · Frequency: some
Weakly bonded old snow and gliding snow require caution.
Weak layers in the old snowpack can be released especially by large additional loads in particular at transitions from a shallow to a deep snowpack, when entering gullies and bowls for example. This applies on very steep slopes above approximately 2200 m. Avalanches can reach large size in isolated cases. Meticulous route selection is recommended. In addition an appreciable danger of gliding avalanches exists. This applies on steep grassy slopes below approximately 2400 m. Areas with glide cracks are to be avoided. The fresh wind slabs are prone to triggering in particular on northwest to north to southeast facing aspects above approximately 2400 m. Caution is to be exercised in particular adjacent to ridgelines.
Faceted weak layers exist in the centre of the snowpack in particular above approximately 2200 m. The fresh wind slabs are lying on soft layers in particular on near-ridge shady slopes at high altitudes and in high Alpine regions. The weather conditions gave rise to moistening of the snowpack below approximately 2200 m. As a consequence of new snow and a gathering strong westerly wind, further wind slabs will form towards the evening. During the course of the night these will increase in size moderately.
The avalanche danger will persist. As a consequence of new snow and a strong to storm force westerly wind, further wind slabs will form.
Bulletin data: Avalanche Warning Service Tirol, avalanche.report (CC BY 4.0)