Avalanche warning for region Indre Troms Monday 10.02.2020

Avalanche Problems

• Dry slab avalanche • The collapsing weak layer is thin < 3 cm. A big and identifiable crystal in the weak layer. • Easy to trigger • 2 - Medium • S, SW, W, NW

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • 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 • Some steep slopes N, NE, E, SE, S, SW, W, NW above 400 masl

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). A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • SW between 800 masl and 500 masl

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. • Very difficult to trigger • 2 - Medium • Some steep slopes N, NE, NW above unknown masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within half a meter • The collapsing weak layer is thin < 3 cm. • Very difficult to trigger • 2 - Medium • Some steep slopes S, SW, W between 1100 masl and 500 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow above a crust • Within a meter • The collapsing weak layer is thin < 3 cm. • Very difficult to trigger • N, NE between 600 masl and unknown masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within half a meter • The collapsing weak layer is thin < 3 cm. A big and identifiable crystal in the weak layer. • Very difficult to trigger • 2 - Medium • Few steep slopes S, SW, W above 1000 masl

Avalanche Problems

• Loose dry avalanche • Buried weak layer of faceted snow beneath a crust • 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 • Few steep slopes W, NW between 700 masl and unknown masl

Avalanche Problems

• Buried weak layer of faceted snow beneath a crust • Within a meter • above unknown masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow above a crust • Within half a meter • A big and identifiable crystal in the weak layer. • Easy to trigger • 1 - Small • N, W, NW between 500 masl and unknown masl

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. • Difficult to trigger • 2 - Medium • Some steep slopes S, SW, W between 1000 masl and 500 masl

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. A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • Few steep slopes N, NE, E, SE, S above 500 masl

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • 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 • 2 - Medium • Few steep slopes N, NE, E, SE, S, SW, W, NW between 800 masl and 400 masl • Det er funnet vedvarende svake lag av kantkorn i store deler av indre Troms region. Det ser ut til at skredproblemet er begrenset til høyder mellom 400-800moh. Dagens obstur identifiserte kantkorn på 700moh. Ny ECT med resultat ECTN på 1050moh viste ingen tegn til bruddforplantning, men gav brudd i tilsvarende lag. Utviklingen av kantkorn/faseteringen har ikke kommet like langt og er derfor ikke aktivt. Skredproblemet er derfor definert til å være dominant mellom 400-800moh.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within half a meter • Very difficult to trigger • 1 - Small • Some steep slopes NW between 600 masl and unknown masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • The collapsing weak layer is thin < 3 cm. • Easy to trigger • 2 - Medium • S, SW, W between 900 masl and 400 masl • Kan sannsynlig ha vært et meget tynt skarelag over basert på andre snøprofiler i området.

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 S, SW, W between 700 masl and 0 masl • ECT 11, middels vanskelig å løse ut. Samme resultat på to piter. Bryter rett under skarelag i kantkorn.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within half a meter • The collapsing weak layer is thin < 3 cm. A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • Some steep slopes S, SW, W between 700 masl and unknown masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near the ground • Within a meter • The weak layer collapses easily and clean (easy propagation). A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • Some steep slopes SW, W, NW between 600 masl and 400 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • 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. • SW, W, NW above 600 masl

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. A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • Some steep slopes N, NE, E, SE, S above 600 masl • Det finnes svake lag i fokksnøen men det skal stor tilleggsbelastning til for å påvirke lagene.

• Dry slab avalanche • Buried weak layer of faceted snow above a crust • The weak layer collapses easily and clean (easy propagation). A big and identifiable crystal in the weak layer. • Difficult to trigger • 3 - Large • Few steep slopes N, NE, E, SE, S, SW, W, NW between 800 masl and 500 masl • ECTP fra lørdag 8. feb ved Kalvhovudet og ECTP fra Reinjerdsfjellet og Storhompen nord av Istinden i Bardu/Målselv i dag på ca 550moh og 950moh foretatt av kurselever ved skredkurs indikerer at det finnes svake lag av kantkorn i snødekket. Stedvis er kantkornlaget lett å påvirke da det er observert drønn i snødekket.

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. • Easy to trigger • 2 - Medium • SE, S, SW above 600 masl • This presistent weak layer could be found in all aspects

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within a meter • The weak layer collapses easily and clean (easy propagation). • Easy to trigger • 2 - Medium • SE, S, SW above 600 masl • Unsure of other aspects, but speculate that persistent weak layer (due to temp and temp gradient) probably prevalent on other aspects too.

Avalanche Problems

• Loose dry avalanche • Very difficult to trigger • 3 - Large • Some steep slopes N, E, SE, S, W, NW above unknown masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within a meter • The collapsing weak layer is thin < 3 cm. • Very difficult to trigger • 3 - Large • Few steep slopes NE, E, SE between 700 masl and 0 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • The collapsing weak layer is thin < 3 cm. • Very difficult to trigger • 3 - Large • Many steep slopes E, SE, S between 2500 masl and 500 masl

Avalanche Problems

• Buried weak layer of faceted snow above a crust • Within half a meter • The overlying slab is soft.

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. • Very difficult to trigger • 2 - Medium • E, SE, S between 700 masl and unknown masl

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. • Very difficult to trigger • 2 - Medium • Some steep slopes N, NE, E, SE, S above 600 masl • No results on ECT, stability is good

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 E, SE, S between 700 masl and 0 masl

Avalanche Problems

• Loose snow

Avalanche Problems

• Loose snow • NE between 600 masl and 500 masl

Avalanche Problems

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within a meter • Very difficult to trigger • 2 - Medium • Some steep slopes E, SE, S between 800 masl and 500 masl

• Poor bonding between layers in wind deposited snow • E, SE, S between 900 masl and 500 masl

Avalanche Problems

• Dry slab avalanche • Very difficult to trigger • 2 - Medium • Some steep slopes E, SE, S between 800 masl and 500 masl

Avalanche Problems

• Dry slab avalanche • Poor bonding between layers in wind deposited snow • Within half a meter • The overlying slab is soft. • Very difficult to trigger • 2 - Medium • Few steep slopes E, SE, S above 500 masl • Brudd i øverste fokksnølag på spadeprøve, ingen utslag på CT og ECT.

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. • Very difficult to trigger • 2 - Medium • Few steep slopes E, SE, S between 800 masl and 500 masl • Ingen utslag på tester. Temperaturgradient over og under skarelag nede i snøen var <0,3 grader. Dette vil utgjøre 1 grad over 10cm og oppbyggende omvandling kan skje.

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 • Few steep slopes N, NE, E, SE above 1000 masl • Har ikke observert problemet, men det er sannsynlig at det kan dannes fokksnøflak som kan løses ut ved liten tilleggsbelastning i høyden. Lavere ned virker det generelt svært stabilt.