Avalanche warning for region Hallingdal Friday 19.02.2021

Avalanche Problems

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • The overlying slab is soft. • Easy to trigger • Some steep slopes N, NE, SW, W, NW above 1000 masl

• Dry slab avalanche • Buried weak layer of faceted snow near surface • A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1000 masl

Avalanche Problems

• 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. A big and identifiable crystal in the weak layer. • Easy to trigger • 2 - Medium • Many steep slopes N, NE, NW above 1100 masl • Overliggende lag er ett mykt flak. Det svake laget var 15cm ved observasjonspunkt. Andre observasjoner på samme tur indikerte samme lag bare tynnere. Settes dermed til lett og løse ut grunnet faren ved rygger/tynnere snødekke. Dette laget er i noen heng observert med rim som sekunder. Eksposisjon utelukker ikke at dette problemet finnes i alle himmelretninger.

• 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. • Easy to trigger • 1 - Small • Some steep slopes N, NE, NW above 1100 masl • Overliggende lag er ett mykt flak. Det svake laget brøyt lett men IKKE glatt. Eksposisjon utelukker ikke at dette problemet finnes i alle himmelretninger.

Avalanche Problems

• Buried weak layer of surface hoar • Within half a meter • The collapsing weak layer is thin < 3 cm. The overlying slab is soft. A big and identifiable crystal in the weak layer. • N, NE, NW between 1200 masl and unknown masl

• Buried weak layer of faceted snow near surface • Within half a meter • The overlying slab is soft. A big and identifiable crystal in the weak layer. • N, NE, NW between 1200 masl and unknown masl

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 • 2 - Medium • Some steep slopes N, NE, E, SE, S, SW, W, NW between 1300 masl and 900 masl • Står fortsatt oppreist, fått flere skytende sprekker på dette laget.

• 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. • Easy to trigger • 2 - Medium • Some steep slopes N, W, NW between 1300 masl and 1000 masl • Lesider der snøen har stor pålagring

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • 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 • Some steep slopes N, SW, W, NW above 1000 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • A big and identifiable crystal in the weak layer. • Easy to trigger • 2 - Medium • Some steep slopes N, W, NW above unknown masl • Varierende hvorvidt overflaterimet står oppreist og hvor potent det fortsatt er.

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within half a meter • Easy to trigger • 2 - Medium • Some steep slopes N, W, NW above unknown masl

Avalanche Problems

• Loose snow

Avalanche Problems

• 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. A big and identifiable crystal in the weak layer. • Very easy to trigger • 2 - Medium • Many steep slopes between 1200 masl and 1000 masl

Avalanche Problems

• Buried weak layer of new snow • Within half a meter • The collapsing weak layer is thin < 3 cm. • N

• Buried weak layer of surface hoar • Within half a meter • A big and identifiable crystal in the weak layer. • N

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • Within a meter • The overlying slab is soft. • Easy to trigger • 2 - Medium • Some steep slopes N, NE, E between 1100 masl and 1000 masl

Avalanche Problems

• Dry slab avalanche • Poor bonding between layers in wind deposited 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 • 2 - Medium • Some steep slopes N, W, NW between 1200 masl and 900 masl • Sjiktovergongar i fokksnøen med svake bindingar.

• 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. A big and identifiable crystal in the weak layer. • Very easy to trigger • 2 - Medium • Some steep slopes N, NE, E, SE, S, SW, W, NW between 1700 masl and 900 masl • Me har funne overflaterim i alle himmelretningar, og fann det same i dag.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within half a meter • The overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 2 - Medium • Many steep slopes N, NE, NW above 1100 masl • Overliggende lag er ett mykt flak. Det svake laget var 15cm ved observasjonspunkt. Andre observasjoner på samme tur indikerte samme lag bare tynnere. Settes dermed til lett og løse ut grunnet faren ved rygger/tynnere snødekke. Dette laget er i noen heng observert med rim som sekunder. Eksposisjon utelukker ikke at dette problemet finnes i alle himmelretninger.

• 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. • Easy to trigger • 1 - Small • Some steep slopes N, NE, NW above 1100 masl • Overliggende lag er ett mykt flak. Det svake laget brøyt lett men IKKE glatt. Eksposisjon utelukker ikke at dette problemet finnes i alle himmelretninger.

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 • 2 - Medium • Some steep slopes N, W, NW between 1100 masl and 900 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. • Very easy to trigger • 1 - Small • Some steep slopes N, NE, E, NW between 1300 masl and 1100 masl

Avalanche Problems

• Dry slab avalanche • The weak layer collapses easily and clean (easy propagation). • Easy to trigger • 2 - Medium • NE

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. A big and identifiable crystal in the weak layer. • Easy to trigger • 2 - Medium • N, NE, NW above unknown masl

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within half a meter • The weak layer collapses easily and clean (easy propagation). The overlying slab is soft. • Easy to trigger • 2 - Medium • N, NE, NW above 1100 masl

Avalanche Problems

• 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. A big and identifiable crystal in the weak layer. • Easy to trigger • 2 - Medium • Some steep slopes E, SE, S, SW, W above 1100 masl • Er et vedvarende svakt lag bestående av kantkorn under den vindtransporterte nysnøen.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within a meter • A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • Some steep slopes N, NE, E, SE, S, SW, W, NW above 900 masl • Vi har vært fra 900moh og opp og gravd i skoggrensen og over skoggrensen i sør og vi gikk litt ned på nordvest siden og gjorde en liten blok test.

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. • Very easy to trigger • 2 - Medium • Some steep slopes SW, W, NW above unknown masl • Observert i denne sektor i dag, men i andre sektorer tidligere (i går og dagen før).

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. • Very easy to trigger • 2 - Medium • Some steep slopes SW, W, NW above unknown masl

Avalanche Problems

• Buried weak layer of surface hoar

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • The overlying slab is soft. • Easy to trigger • 1 - Small • Some steep slopes N, NE • Dette er hva vi observerte på turen. Eksposisjon utelukker dermed ikke at problemet finnes i alle himmelretninger.

Avalanche Problems

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within half a meter • The overlying slab is soft. • Very easy to trigger • 1 - Small • Few steep slopes N, NE, W, NW between 1200 masl and 1000 masl • Rundt tregrensa

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. • Very easy to trigger • 2 - Medium • Some steep slopes SW, W, NW above 1100 masl • Skredproblem observert i andre himmelretninger, men er knyttet til hvor det finnes fokksnøflak.

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within half a meter • The collapsing weak layer is thin < 3 cm. A big and identifiable crystal in the weak layer. • Difficult to trigger • 3 - Large • Many steep slopes SW, W, NW above 1000 masl • Finnes sannsynligvis i de fleste himmelretninger. Vanskelig å påvirke, krever stor tillegsbelastning.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within half a meter • The overlying slab is soft. • Easy to trigger • N, NE, E between 1100 masl and 900 masl

Avalanche Problems

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within half a meter • Difficult to trigger • 1 - Small • Few steep slopes N, NE, W, NW between 1200 masl and 1000 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within half a meter • Easy to trigger • 2 - Medium • Some steep slopes N, NE, W, NW between 1600 masl and 1000 masl

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within half a meter • The overlying slab is soft. • Easy to trigger • 2 - Medium • Some steep slopes N, NE, W, NW between 1500 masl and 1100 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. • Very easy to trigger • 2 - Medium • N, W, NW between 1300 masl and 900 masl • Snøen bygger seg opp på V-NV-N pga vindtransport frå SA. Den vindtransportterte snøen flakar seg på toppen av eit tynt DF lag, og brudda går i dette svake laget.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • The weak layer collapses easily and clean (easy propagation). • Very easy to trigger • 2 - Medium • N, W, NW above unknown masl • Nedføyket svakt lag av nysnø, varierende hvor dypt laget ligger. Der store mengder snø kan samle seg vil det være betydelig fare for å løse ut.

Avalanche Problems

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within half a meter • The overlying slab is soft. • Very easy to trigger • 2 - Medium • N, NE, NW between 1200 masl and 1100 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new 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. • Very easy to trigger • 2 - Medium • Some steep slopes N, W, NW between 1200 masl and 900 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • The overlying slab is soft. • N between 1100 masl and unknown masl

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • 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 • Some steep slopes N between 1100 masl and unknown masl • Gjennomførte PST på overflaterimet. Resultat PST 35/100 Arr 32.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within half a meter • Difficult to trigger • 1 - Small • Some steep slopes N, NE, W, NW between 1300 masl and 1000 masl

Avalanche Problems

• Dry slab avalanche • Within half a meter • Easy to trigger • 2 - Medium • NE between 1200 masl and 1100 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • The collapsing weak layer is thin < 3 cm. • Easy to trigger • 1 - Small • Few steep slopes N, W, NW between 1400 masl and 900 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • The collapsing weak layer is thin < 3 cm. The overlying slab is soft. • Easy to trigger • 2 - Medium • Some steep slopes N, S, SW, W, NW above 1000 masl

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within a meter • A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1000 masl