Avalanche warning for region Hallingdal Saturday 13.02.2021

Avalanche Problems

• Within half a meter • The overlying slab is soft. A big and identifiable crystal in the weak layer. • Few steep slopes N, NE, E, SE, S, SW, W, NW between unknown masl and unknown masl • Rimlaget ligger stort sett øverst i snøen, men i få bratte heng har det havnet fokksnø oppå som kan være ett skredproblem.

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 • 2 - Medium • Some steep slopes E, SE above unknown masl • Nye vind på formiddagen har flyttet fokksnø til østlige og sørøstlige heng

• 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 unknown masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • Difficult to trigger • 1 - Small • Some steep slopes N, NE, NW between 1200 masl and 1100 masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • Difficult to trigger • 1 - Small • Some steep slopes N between 1200 masl and 1100 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. • W, NW • Kan bli et kommende skredproblem med mer vindtransportert snø oppå det svake laget.

• Dry slab avalanche • Buried weak layer of faceted snow near surface • The weak layer collapses easily and clean (easy propagation). A big and identifiable crystal in the weak layer. • Very difficult to trigger • 4 - Very large • Few steep slopes W, NW between 1200 masl and 1100 masl • Svært hardt lag av RG. Løste ved isolasjon i 19° helning. Kan kanskje fjernutløses på tynnere snøpakke.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within half a meter • A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • Some steep slopes S, SW, W 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. • Easy to trigger • 2 - Medium • Some steep slopes E, SE, S above unknown masl • Utbredelsen av skred er ved de fleste heng i S/SØ.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Within 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 SE, S • Flak av fokksnø på overflaten som bryter lett på lag av kantkorn. Foreløpig lite binding i flaket - forventer kun små skred ved påvirkning av skiløper. Videre løsner blokken i bunn ved hard påvirkning.

Avalanche Problems

• N

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. A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • E • Vanskelig å løse ut skred. På grunn av vinden lastes det snø i østlige heng og laget over svakt lag bygger seg opp med 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). A big and identifiable crystal in the weak layer. • Easy to trigger • 2 - Medium • Few steep slopes E, SE, S, SW, W between 1300 masl and 900 masl • Laget er NEDFØYKA OVERFLATERIM, ikkje nedsnødd overflaterim slik det står, men det var den beskrivinga som var nærast. Eg har kun sjekka snøen i SV/ S /SØ men på grunn av tidlegare vær forventast problemet å ligge i alle himmelretningar. Nedbrytande prosessar har stor innveknad på om ein vil finne problemet eller ikkje. Der vinden har tatt vil ein ikkje finne desse krystallane ståande og det vil ikkje vere eit problem. Dermed kan ein og anta at ein ikkje finne SH i øvste del av fjellet. Einaste grunnen for at dette vil utgjere eit skredproblemet er om snø vil leggje seg som eit flak på toppen av SH laget. Dette vil då kun vere eit problem i få heng der krystallane fortsatt står samt at det er blitt transportert snø oppå krystallane. Ut i frå piten eg grov var ikkje dette eit skredproblem pga ingen snø på toppen av SH.

• Dry slab avalanche • Buried weak layer of faceted snow beneath a crust • Within half a meter • A big and identifiable crystal in the weak layer. • Easy to trigger • 2 - Medium • N, NE, E, SE, S, SW, W, NW between 1300 masl and 1100 masl • Det svake laget består av kantkorn under skarelag. Kantkorna er frå 2-2,5 mm store. Laget der brotet skjer er 4cm tjukt. Eg har kun sett på snølaga i S/ SV / SØ vendte sider, men mest truleg vil dette skredproblemet breie seg ut i alle himmelretningar ut i frå det været me har hatt den siste tida.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow near surface • Easy to trigger • 2 - Medium • Some steep slopes SW, W, NW

Avalanche Problems

• Dry slab avalanche • Easy to trigger • 2 - Medium • Many steep slopes E, SE, S above unknown masl

Avalanche Problems

• Loose snow

Avalanche Problems

• Dry slab avalanche • Buried weak layer of new snow • Within half a meter • Easy to trigger • 2 - Medium • Some steep slopes E, SE, S, SW, W

Avalanche Problems

• Buried weak layer of faceted snow beneath a crust • Within a meter • The overlying slab is soft. • SE, S, SW • Vanskelig å påvirke. Se test.

• Buried weak layer of faceted snow near surface • Within half a meter • SE, S, SW • RGxf på 40-66cm

• Buried weak layer of faceted snow above a crust • Within a meter • A big and identifiable crystal in the weak layer. • SE, S, SW

Avalanche Problems

• Dry slab avalanche • Buried weak layer of faceted snow above a crust • Within a meter • A big and identifiable crystal in the weak layer. • Difficult to trigger • 1 - Small • Some steep slopes N, NE, NW

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. A big and identifiable crystal in the weak layer. • Difficult to trigger • 1 - Small • S, SW between 1000 masl and 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. A big and identifiable crystal in the weak layer. • Difficult to trigger • 2 - Medium • Few steep slopes S, SW between 1200 masl and 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. • 2 - Medium • Few steep slopes E, SE, S between 1200 masl and 1100 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. • Very easy to trigger • 2 - Medium • Few steep slopes S between 1200 masl and unknown masl

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • The overlying slab is soft. • Very easy to trigger • 1 - Small • Few steep slopes S, SW between 1200 masl and unknown masl • Overflaterim beskyttet av tynt lag DF. Vil kunne skape problem ved lagdannelse på overflaten.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • 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 S between 1300 masl and 1100 masl • Nedsnødd overflaterim, stående krystaller, ved nytt snøfall kan det forverre situasjonen.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • 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 E, SE, S, SW, W between 1300 masl and 1100 masl • Nedføyket overflaterim, stående rimkrystaller. Under et mykt RG lag. Skredfaren kan øke ved nytt snøfall.

Avalanche Problems

• Dry slab avalanche • Buried weak layer of surface hoar • Within half a meter • 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, S, SW, W, NW above 1000 masl • Rimet er i ferd med å bli omdannet til kantkorn

• 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 • Few steep slopes N, NE, E, SE, S, SW, W, NW above 1000 masl