Avalanche forecast for Trollheimen Tuesday 2019-02-05

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 south., change to fresh breeze from the south during the afternoon.
-14 °C to -8 °C at 1400 m a.s.l.
Clear skies.

For updated info, please visit yr.no
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

Observations the last 3 days

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 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

Danger Sign

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

Weather

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

Avalanche Danger Assessment

2 Moderate Forecast correct

Tests

CTN Good

Snow Cover

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

ObsID: 179252

Trollheimen / SURNADAL

Snow

02.02.2019 kl. 16:53

658 masl

jornf (Unknown)

Image Of Avalanche Observation
Image 1 of 1 Of:  Avalanche Observation Copyright: 

Avalanche Observation

2. Feb 10:30 (+01:00) Dry slab avalanche 1 - Small Remotely triggered N-facing 30 cm high fracture In gully or concave form Lite skred fjernutløst på noen få meters avstand. Hard fokksnø skled ut på hardt skarelag. Lite ufarlig heng. Fjernutløst ovenfra der fokksnøen var mykere

Incident

Snow Did not affect anything Backcountry skiing

ObsID: 178877

Trollheimen / Lønset, 62*41’48’’N, 9*8’2’’Ø

Snow

02.02.2019 kl. 15:15

923 masl

Sofie@ski (Unknown)

Image Of Avalanche Observation
Image 1 of 4 Of:  Avalanche Observation Copyright: 
Image Of Avalanche Observation
Image 2 of 4 Of:  Avalanche Observation Copyright: 
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Image 3 of 4 Of:  Avalanche Observation Copyright: 
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Image 4 of 4 Of:  Avalanche Observation Copyright: 

Avalanche Observation

2. Feb 15:15 (+01:00) Dry slab avalanche 1 - Small Human triggered S-facing Avalanche release at 933 masl 35 cm high fracture Steep slope

ObsID: 178881

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.