Avalanche warning for region Hallingdal Friday 15.12.2023

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 above 900 masl • Skredproblemet vil være lett å kjenne igjen ved bundet snø i overflaten. Utbredelsen og skredstr vil øke raskt ved vindøkning. I dag er vurderinga er sted mellom 1 og 2

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 • N, NE, E, SE, S, SW, W, NW

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • 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 • S, SW • Kantkorn med mulig innslag av rim. Oberservert en tydelig krystall på glideflaten

Avalanche Problems

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within half a meter • The collapsing weak layer is thin < 3 cm. • Easy to trigger • 1 - Small • Few steep slopes E, SE, S above 1000 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. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1100 masl • Har kun vært over 1000moh. Verkar som skredproblemet ligger i alle himmelretningen der det kan være ei le side.

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. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1100 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • 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. • Difficult to trigger • 1 - Small • Few steep slopes S, SW, W above 1000 masl • Iom at det ikke var noe kollaps eller propagering på ECT og iom at jeg ikke opplevde tydelige drønn, så har jeg inntrykk om at det er ikke er mer betent enn i går, men heller likt.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • The collapsing weak layer is thin < 3 cm. The overlying slab is soft. • Easy to trigger • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW • Skredproblemet forventes å finnes i lesider/lommer hvor det har lagt seg snø. Fortsatt ikke nok snø i terrenget for å få store skred

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • 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. • Difficult to trigger • 1 - Small • Some steep slopes

• Dry slab avalanche • Buried weak layer of faceted snow near the ground • Within a meter • Very difficult to trigger • 2 - Medium • Ikke et problem i dag, men det kan skje ting med mye regn som kan komme.

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. • Easy to trigger • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1100 masl • Har kun vært rundt 1100 m høyde

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. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1100 masl • Ikke vært lavere enn 1100 moh

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. • Easy to trigger • 1 - Small • Some steep slopes • Har kun vært på ca 1150moh

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 overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Some steep slopes SW above 1000 masl • Litt for mykt og tynt enda for å være veldig skummelt.

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • The weak layer collapses easily and clean (easy propagation). A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Few steep slopes SW, W above 1000 masl • Det nedsnødd overflaterim i ca. 40 cm dybde. Lett å påvirke (kollapsa ved saging av blokk til LBT), men usikker på propageringsevne. Naboen gravde i litt tynnere snødekke, der begerkrystaller nederst mot bakken var hissige.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • 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. • Difficult to trigger • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1000 masl • Har ikke vært under 1080moh.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • 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 • Few steep slopes S, SW, W above 1000 masl • Skredproblemet finnes typisk i leformasjoner bak rygger. Kan finnes rester av overflaterim, se bilde.

Avalanche Problems

• Loose dry avalanche • Buried weak layer of surface hoar • Within half a meter • The weak layer collapses easily and clean (easy propagation). The overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW above unknown masl • Svake lag finnes i de fleste heng der snø har samlet seg, dybde til det svake laget varrierer alt etter himmelretning og vindtransportert snø

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 overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Some steep slopes S, SW, W above 1000 masl • Trengte mer belastning for å få brudd i svakt lag enn for to dager siden. Tynt overliggende lag av vindpakket snø kan påvirke størrelsen på skredene.

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 • N, NE, E, SE, S, SW, W, NW above unknown 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. 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 above 1000 masl • Basert på tidligere observasjoner de siste dagene i det samme området er det sannsynlig at problemet fortsatt kan gjelde i alle himmelretninger da det ikke har vært noe vind av betydning

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow above a crust • Within half a meter • The overlying slab is soft. A big and identifiable crystal in the weak layer. • Difficult to trigger • 1 - Small • N, NE, E, SE, S, SW, W, NW above 1000 masl • Det fins kantkornlag i forskjellige sjikt i snødekket. Det er lite sammenhengende fokksnøflak over kantkornlagene, skred større enn str1 er lite sannsynlig

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 overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Few steep slopes S, SW, W above 1000 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. • Easy to trigger • 1 - Small • Some steep slopes S, SW • 1100moh

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • The weak layer collapses easily and clean (easy propagation). • Easy to trigger • 1 - Small • Many steep slopes N, NE, E, SE, S, SW, W, NW between unknown 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 • 1 - Small • Many steep slopes N, NE, E, SE, S, SW, W, NW • Kun undersøkt snødekket på rundt 1100 moh.

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 • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1100 masl • Alle tester er gjort på ca samme høyde 1100-1200 meter

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. The overlying slab is soft. • Easy to trigger • 1 - Small • Few steep slopes S, SW above 1000 masl

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 S, SW, W, NW

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • The weak layer collapses easily and clean (easy propagation). A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW above 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 • 1 - Small • Many steep slopes N, NE, E, SE, S, SW, W, NW

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. The overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Few steep slopes S, SW, W above 1000 masl • I området som obsturen gikk er vurderingen at det ikke er store nok snøansamlinger til å skape str2-skred selv om egenskapene til det svake laget tilsier at skred kan bli større.

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 overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Few steep slopes SW, W above 1000 masl • Nedsnødd kantkorn er et svakt lag med antakelig stor utbredelse. Det er likevel lite snø i terrenget, noe som begrenser både ev skredstørrelse og propageringsmuligheter. Skredproblem er begrenset til noen få bratte heng som har nok innblåst snø.

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. • Easy to trigger • 1 - Small • Some steep slopes • Terrenget styrer vinden, og skredproblemet gjelder der det er lommer av vindtransportert snø

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. The overlying slab is soft. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Few steep slopes S, SW, W above 1000 masl • Skredproblemet er avhengig av utbredelsen av foksnøen. Den ferske foksnøen har på turen jeg har gått vært veldig begrenset. Over tregrensa. Sannsynligvis dannet nær overflaten før siste snøfall.

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. • Easy to trigger • 1 - Small • Some steep slopes SE, S, SW, W, NW • Hvor det har vært vindtransport inn i leheng. Terrenget vil delvis påvirke eksposisjon

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. A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1000 masl • Har ikkje vært under 1080 så er usikker korleis snøen er påvirka under dette.

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 • 1 - Small • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1000 masl • Har ikke vært lavere enn 1080 moh, usikker på hvor nedre grense av skredproblemet er.

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 • Some steep slopes • Rimet finnes overallt, men flaken ligger kun i forsenkinger og plasser med inføyket snø.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow above a crust • Within 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 • Some steep slopes N, NE, E, SE, S, SW, W, NW above 1000 masl • Vi har ikke vært lavere enn 1080moh. Usikker hvor nedre grense for skredproblemet er.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within a meter • The weak layer collapses easily and clean (easy propagation). 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 above 1000 masl • Vi har ikke vært lavere en 1080moh så usikker på hvor nedre grense av skredproblemet ligger