Avalanche forecast for Trollheimen Wednesday 2019-02-13

3
Considerable
Published:

Temperature rise may give some wet sluffs below approx. 1100 m a.s.l. Moderate gale from SW, and some snow, will form storm slabs at higher altitudes. Persistent week layers of faceted snow in the snow pack may in some cases lead to slab avalanches, caused by snow melt at low altitudes or loading at higher altitudes.

New snow (slab avalanches)

Buried weak layer of new snow

Avoid terrain traps and steep slopes until the new snow has stabilized. The avalanche problem is generally widely distributed on any steep slope with deep new snow. Look for cohesive new snow that breaks apart or is poorly bonded to the old snow. Cracks around your skis are a typical dangersign.
3 - Large
Spontaneous release
Some steep slopes
Possible

Wet snow (loose snow avalanches)

Loose snow

Avoid avalanche release and run out areas. Wet snow avalanches tend to release spontaneously. Timing is important. Stability decreases when the snow surface gets wet and soft.
2 - Medium
Spontaneous release
Many steep slopes
Possible

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.
3 - Large
High additional load
Some steep slopes
Possible

What are avalanche problems?

5 mm precipitation, up to 12 mm in the most exposed areas.
Moderate gale from west., change to strong breeze from the southwest.
-6 °C to -2 °C at 1400 m a.s.l.
Plus degrees up to 1100 m a.s.l. during the evening.
Cloudy.

For updated info, please visit yr.no
7 mm precipitation.
Strong breeze from northwest., change to moderate gale from the southwest during the evening.
-11 °C to -4 °C at 1400 m a.s.l.
Plus degrees up to 600 m a.s.l. during the evening.
Cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Rapportert av: drift@svv (**)

i kommune: SUNNDAL

Avalanche evaluation

3 Considerable

Dangersign

Quick temperature change

Dangersign

Much water in the snow

regn på snø

Rapportert av: Erling Snøva (*)

i kommune: SUNNDAL

Snow cover

92 cm snødybde

18 cm nysnø siste døgn

Weather

No precipitation

-1.0 grader

Rapportert av: drift@svv (**)

i kommune: Oppdal

Avalanche evaluation

3 Considerable

Dangersign

Recent snowdrift

Rapportert av: Robert Ulfsnes (Unknown)

i kommune: SUNNDAL

Snow cover

28 cm nysnø siste døgn

Rapportert av: Erling Snøva (*)

i kommune: SUNNDAL

Snow cover

82 cm snødybde

37 cm nysnø siste døgn

Weather

Snow

-1.0 grader

Rapportert av: Hans Erik@ferdaråd (***)

i kommune: Oppdal

Avalanche evaluation

3 Considerable

Avalanche problems

Loose snow

Avalanche problems

Buried weak layer of new snow

Snow cover

Snow profile (2012)

12-15 cm ubunden løssnø over eldre flak 1f fokksnø. Dette hviler på et lag av nedføyket nysnø (der jeg ikke har sett det så tykt andre steder) over hardere fokksnøplate. Ikke mulig se på kornform og størrelse pga vinden blåser alt av rasterplaten.

104140

Coloumn test

Medium

CTM11@10cmQ2

Dangersign

Large snowfall

Område: Generelt på fjellet. Beskrivelse: Snør tett, bygevær langt inn i landet. Kommer som snø helt ned (for indre deler, er laveste pkt 600 moh)

Dangersign

Recent snowdrift

Område: Generelt på fjellet. Beskrivelse: Over skogen er det tidlig antydning til myke fokksnøflak, disse vil være mer banket av vinden og markerte høyere.

Dangersign

Recently made cracks

Område: I denne fjellsiden. Beskrivelse: I området rundt skoggrensa og ned er den gamle fokksnøen svekket, noen steder (høyest) er det et sjikt mellom to fokksnøplater med rim, som bryter lett og glatt der overliggende (utglidende flak) er 5 cm, med 10-15 cm løssnø og etter hvert fokksnøflak over. Lavere er det et tykt lag nedføyket løssnø under tilsvarende fokksnølokk. Det gamle snødekket rett under nysnøen sprekker og faller sammen, noen steder av skiløper andre steder må det manipuleres (gynging) gjelder N, NØ.

Click here for pictures and the full observation

Rapportert av: Hans Erik@ferdaråd (***)

i kommune: Oppdal

Snow cover

120 cm snødybde

10 cm nysnø siste døgn

Coloumn test

Medium

CTM19@10cmQ1

Weather

Snow

-5.0 grader

Click here for pictures and the full observation

Rapportert av: Hans Erik@ferdaråd (***)

i kommune: Oppdal

Snow cover

70 cm snødybde

10 cm nysnø siste døgn

Weather

Snow

-4.0 grader

Click here for pictures and the full observation

Rapportert av: drift@svv (**)

i kommune: SUNNDAL

Avalanche evaluation

3 Considerable

Avalanche activity

No avalanche activity Not given

Not given

Dangersign

Quick temperature change

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.