Avalanche warning for region Jotunheimen Sunday 23.04.2023

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. A big and identifiable crystal in the weak layer. • Difficult to trigger • 3 - Large • Some steep slopes E, SE, S, SW, W above 1600 masl • Stor tilleggsbelastning kreves, men pålagring av nysnø eller oppvarming av snøoverflaten kan medføre at skred kan gå naturlig eller ved liten tilleggsbelastning. Har observert 6 flakskred i området i høyder mellom 1900 og 2200 moh som sannsynligvis har gått på dette laget i løpet av de siste dagene. Observert i Ø, SØ, V og SV

• Dry slab avalanche • Buried weak layer of faceted snow near the ground • Within a meter • A big and identifiable crystal in the weak layer. • Very difficult to trigger • 4 - Very large • Some steep slopes E, SE, S, SW, W above 1500 masl • Hele snødekket i sørflanken av Styggehøbreatindene har rast ut på grunn av dette svake laget.

• Dry slab avalanche • Buried weak layer of faceted snow near surface • 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. • Very easy to trigger • 2 - Medium • Few steep slopes E, W • I noen få bratte heng har det blitt dannet kantkornet snø under et tynt skarelag i overflaten. Dette svake laget snør nå ned, men foreløpig er det lite vind og snøen som kommer er ubunden.

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within a meter • The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. A big and identifiable crystal in the weak layer. • Very difficult to trigger • 3 - Large • Some steep slopes N, NE, NW above 1500 masl • Tynt lag med kantkornet snø på 65 cm dybde.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within a meter • The collapsing weak layer is thin < 3 cm. A big and identifiable crystal in the weak layer. • Difficult to trigger • 3 - Large • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1600 masl

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within half a meter • The collapsing weak layer is thin < 3 cm. The overlying slab is soft. • Difficult to trigger • 2 - Medium • Some steep slopes N, NE, NW above 1600 masl • Enkelte kantkorn i sjiktet mellom to fokksnølag av ulik hardheit.

Avalanche Problems

• Loose wet avalanche • Water pooling in/above snow layers • Within half a meter • The collapsing weak layer is thin < 3 cm. • Spontaneous release • 1 - Small • E, SE, S, SW, W • For det meste fokusert på østvendt terreng. Under sterk solinnstråling må en forvente naturlig utløste små skred der sola får tak en del timer. Som oftest ved oppstikkende berg

• Wet slab avalanche • Buried weak layer of faceted snow near surface • Within half a meter • Difficult to trigger • 2 - Medium • Few steep slopes E • Kun observert i Ø sider, men kan være aktuelt i andre eksposisjoner med solinnstråling. Vått str 2 flakskred v/Langøddin (obs 343207) kan ha gått på dette svake laget.

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. The overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 2 - Medium • Few steep slopes N, NE, NW above 1300 masl

• Loose wet avalanche • Loose snow • Easy to trigger • 2 - Medium • Few steep slopes SE, S, SW above 1300 masl