Avalanche forecast for Trollheimen Wednesday 2019-02-06

2
Moderate
Published:

Be careful in lee areas with wind deposited snow, typically behind ridges, ribs and in gullies. Wind deposited snow could rest on a weak layer of buried surface hoar.

Persistent weak layer (slab avalanches)

Buried weak layer of faceted snow near surface

Keep distance to each other when traveling in avelanche terrain. NB, remote triggering is possible. Make very conservative route choices, especially in unknown terrain, after snowfall and if temperatures rise. Identifying areas where the weak layer is present might be difficult and requires experience. Danger signs are whoumpf-sounds and cracking which means that you influence weak layers and should avoid avalanche terrain. However, absence of signs does not mean it is safe.
2 - Medium
Low additional load
Isolated steep slopes
Possible

Persistent weak layer (slab avalanches)

Buried weak layer of surface hoar

Keep distance to each other when traveling in avelanche terrain. NB, remote triggering is possible. Make very conservative route choices, especially in unknown terrain, after snowfall and if temperatures rise. Identifying areas where the weak layer is present might be difficult and requires experience. Danger signs are whoumpf-sounds and cracking which means that you influence weak layers and should avoid avalanche terrain. However, absence of signs does not mean it is safe.
2 - Medium
Low additional load
Isolated steep slopes
Possible

What are avalanche problems?

Observations the last 3 days (map placed)

0 mm precipitation.
Breeze from northeast.
-13 °C to -8 °C at 1400 m a.s.l.
Partly cloudy.

For updated info, please visit yr.no
0 mm precipitation.
Strong breeze from south.
-13 °C to -6 °C at 1400 m a.s.l.
Plus degrees up to 300 m a.s.l. during the evening.
Partly cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Trollheimen / Oppdal

Snow

06.02.2019 kl. 13:00

983 masl

Hans Erik@ferdaråd (***)

Image Of Notes
Image 1 of 2 Of:  Notes Copyright:  Hans Erik@ferdaråd Comment:  Snødybde 105 cm, myk fokksnø / ubunden i toppen 5 cm, over 10 cm 4f, 30 cm 1f før pennehardt mot bunn. Siste 20 cm gjentatte skarelag og is. Brudd ved lille blokktest, bryter lett og glatt ved liten belastning i sjikt i fokksnø, mulig tynt lag nedføyket nysnø i øvre halvdel. Også observert kant mot bakke.
Image Of Tests
Image 2 of 2 Of:  Tests Copyright:  Hans Erik@ferdaråd

Snow Cover

No snowdrift 0 cm new snow Dry Ujevn snøfordeling, dybde og hardhet i indre deler av regionen med mye avblåst terreng i V og til dels S sektor, og tynne stort sett harde fokksnøflak der det ligger snø mens det i N og Ø er betydelig mer snø, noen steder også tilgjengelig ubunden snø 5-10 cm dype lommer. Stort sett bærende overflate i alle himmelretninger med unntak av disse enkelte lommene som gir noe innsynk.

Avalanche Problems

Dry slab avalanche Buried weak layer of faceted snow beneath a crust Difficult to trigger N, NE, S, SW, W, NW Flere skarelag ned mot bakken med kantkorn under det øvre skarelaget mot fokksnøen og tidvis observert kantkorn mot bakken også i sørlig sektor i enkelte heng med tynt snødekke.

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. Difficult to trigger 2 - Medium SW not between 1000 masl and 600 masl Flanke mot SV på heng som i hovedsak vender Sør, noe ubunden snø og myk fokksnø mot SV, avtagende dybde og økende hardhet mot sør. Mye avblåst terreng i området, kun enkeltheng med innblåst snø.

Weather

No precipitation 100% clouds

Tests

CTN Good Går ikke ut på CT, men løsner lett v blokktest på sjiktovergang i fokksnø / nedføyket tynt lag av nysnø på 30 cm. Q1.

Danger Sign

Whumpf sound Drønn i snøen ved overgang fra heng mot tynnere snødekke i sørvendt heng.

ObsID: 179373

Trollheimen / Oppdal

Snow

05.02.2019 kl. 14:57

1373 masl

Hans Erik@ferdaråd (***)

Tests

ECTN Ingen brudd på ECT. NØ vendt. Snødybde her 120 cm

ObsID: 179267

Trollheimen / Oppdal

Snow

05.02.2019 kl. 11:35

1289 masl

Hans Erik@ferdaråd (***)

Image Of Snow Cover
Image 1 of 5 Of:  Snow Cover Copyright:  Hans Erik@ferdaråd
Image Of Snow Profile
Image 2 of 5 Of:  Snow Profile Copyright:  Hans Erik@ferdaråd Comment:  Tynt snødekke i N-NV med smelteskarelag 5-10 cm under overflaten, rimkrystaller på skarelag under pennehardt fokksnøflak. 2/3 avstand fra toppen nytt skarelag med kantkorn under og kantkorn og beger mot bakken. Snødekke 55 cm
Image Of Snow Profile
Image 3 of 5 Of:  Snow Profile Copyright:  Hans Erik@ferdaråd
Image Of Weather
Image 4 of 5 Of:  Weather Copyright:  Hans Erik@ferdaråd
Image Of Snow Profile
Image 5 of 5 Of:  Snow Profile Copyright:  Hans Erik@ferdaråd Comment:  Profil i NØ heng (flanke) total snødybde 200 cm, 30 cm under fokksnøflak 1f er det et skarelag med nedføyket nysnø, delvis kant og rim. Ved spadetest løser det lett ut, men ved CT og ECT er det ingen reaksjon.

Avalanche Danger Assessment

2 Moderate Forecast correct

Snow Cover

55 cm in total No snowdrift Wind slab (hard slab) Dry

Avalanche Problems

Dry slab avalanche Buried weak layer of faceted snow near the ground Within half a meter A big and identifiable crystal in the weak layer. Difficult to trigger Unlikely 2 - Medium Specific steep slopes NW

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. Difficult to trigger Possible Widespread steep slopes N, NE, E

Weather

No precipitation -10 °C 2 m/s from N ↓

Tests

CTN Good

Danger Sign

Surface hoar Område: Generelt på fjellet. Beskrivelse: Kaldt og klart vær, betydelig rimdannelse.

ObsID: 179252

The bulletin does not include a detailed text about the avalanche conditions. This is only given in Norwegian. Translate it using google translate if you like. The text result will be informative, and most likely amusing

For planning your trip and recognizing avalanche terrain, use maps.

Norway has 1:50 000 maps for the whole country. Maps can be bought at bookstores and sports shops, or printed from the net.

Visit www.ut.no for topographic maps online. For slope angle maps, see NGI slope angel maps ("helning" means slope angle).

Modelled snowpack and historic and current weather information can be found on the webpage senorge.no. This site uses information from the weather stations and interpolate values from the stations for gridded maps.

Detailed weather forecast can be found online at www.yr.no or www.storm.no. Yr.no is also in English, but the weather in text format is only given in Norwegian.