Avalanche warning for region Indre Fjordane Saturday 25.03.2023

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. The overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Few steep slopes N, NE, E, SE, W, NW above 900 masl • Utbredelse begrenses av flakdannelsen .

• Dry slab avalanche • Buried weak layer of new snow • Difficult to trigger • 2 - Medium • Few steep slopes N, W, NW above 800 masl

Avalanche Problems

• Within a meter • Mulig det er dårlig binding mellom to fokksnø lag som førte til brudd i svakt lag

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within half a meter • The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. • Easy to trigger • 2 - Medium • Some steep slopes • Grov profil i leformasjon. Fann skarelaget under 20cm fokksnø. Tok ein ca liten blokktest (hadde gløymt sag) og løyste ut eit brot i skarelaget. Vanskelig å sjå krystallane grunna snøfokk men kan anta at det er kantkorn. Er heilt avhengig av styrke på skaren kor lett det er å løyse. Den verka for det meste sterk, men ein kan tenke at det kan vere eit problem der skaren er svakare, for eksempel i høgda. Men er lite snø tilgjengelig over skaren så noko størrelse kan det berre bli i leformasjonar

• Dry slab avalanche • Poor bonding between crust and overlying snow • Within half a meter • The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. The overlying slab is soft. • Easy to trigger • 1 - Small • Few steep slopes • Fokksnø på skare braut då skaren braut

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • The collapsing weak layer is thin < 3 cm. The overlying slab is soft. • Difficult to trigger • 2 - Medium • Few steep slopes N, NE, E, NW above 900 masl • Fokksnøen har fått stabilisert seg, men kan nok løysast ut ved stor tilleggsbelastning enkelte stader. Begrensa str. Viser liten evne til bruddforplantning.

• Loose wet avalanche • Loose snow • Spontaneous release • 1 - Small • Some steep slopes SE, S, SW, W above 800 masl • Soloppvarming kan gi skredaktivitet i siste nysnøen

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within a meter • Very difficult to trigger • 3 - Large • Few steep slopes N, NE, E, SE, S, SW, W, NW above 900 masl • Kan fortsatt finnast restar av kantkornlaget rundt skarelag nede i snødekket. Generelt vanskeleg å påvirke, men kan være muleg på stader med tynt snødekke.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow above a crust • Within half a meter • The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. The overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 3 - Large • Some steep slopes N, NE, NW above 1000 masl

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • The overlying slab is soft. A big and identifiable crystal in the weak layer. • Difficult to trigger • 3 - Large • Some steep slopes N, NE, E, NW above 1100 masl

Avalanche Problems

• Wet slab avalanche • Poor bonding between crust and overlying snow • Within a meter • Difficult to trigger • 2 - Medium • Some steep slopes N, NE, E, SE, S, SW, W, NW above unknown masl • Merket tydelig lagdeling i nysnøen mot gammel skare.

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • Difficult to trigger • 2 - Medium • Some steep slopes NE, E, SE, S above 1000 masl • Fokksnø som hard overliggende lag på skare.