Avalanche forecast for Nordenskiöld Land Wednesday 2019-02-13

2
Moderate
Published:

Wind deposited snow could rest on a persistent weak layer of facets. In some areas an avalanche can be triggered by snowmobiles. There are wind-slabs in the high mountains, most in eastern part of the region.

Wind drifted snow (slab avalanches)

Poor bonding between layers in wind deposited snow

Be careful and keep distance to each other in steep (above 30 degrees) terrain with fresh wind deposited snow, especially convex terrain. An avalanche is easier to trigger where wind slabs are thin or soft. Look for areas where the wind recently has deposited snow, typically behind ridges, ribs and in gullies. Remember that local wind effects will cause variation in where the wind slabs occur.
2 - Medium
High additional load
Specific 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
Specific steep slopes
Unlikely

What are avalanche problems?

Observations the last 3 days (map placed)

3 mm precipitation.
Fresh breeze from east.
-22 °C to -15 °C at 700 m a.s.l.
Cloudy.

For updated info, please visit yr.no
0 mm precipitation.
Breeze from southeast.
-23 °C to -15 °C at 700 m a.s.l.
Partly cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Nordenskiöld Land / Sukkertoppen

Snow

13.02.2019 kl. 12:00

130 masl

HoltH@unis (***)

Image Of Snow Cover
Image 1 of 1 Of:  Snow Cover Copyright:  Comment:  TLS data displaying the changes to the snow depth on Sukkertoppen since the last scan taken on 2019-01-30 and described in https://www.regobs.no/Registration/178709. Linear patterns are data fragments and do not represent such patterns on the snow surface (the scanner doesn't like being super cold).

Snow Cover

Relatively little change to the snow depths in Sukkertoppen over the last 2 weeks. Maximum snow depth increases (about 1 m) are under the avalanche barriers above Lia. Otherwise, snow depth increases in the upper starting zone reach a maximum around 40 cm in the drift at the very top of the starting zone. The majority of this deposition likely occurred during the wind event early yesterday as seen on the data from the Sukkertoppen DRIVA snow sensor.

ObsID: 180786

Nordenskiöld Land / SVALBARD

Snow

13.02.2019 kl. 11:48

179 masl

Sigmund@obskorps (****)

Image Of Snow Cover
Image 1 of 6 Of:  Snow Cover Copyright:  Comment:  Sukkertopp fonna
Image Of Snow Cover
Image 2 of 6 Of:  Snow Cover Copyright:  Comment:  Fra toppen av Sukkertoppen mot Platåfjellet
Image Of Snow Cover
Image 3 of 6 Of:  Snow Cover Copyright:  Comment:  Gruvefjellet og Nordenskioldtoppen
Image Of Snow Cover
Image 4 of 6 Of:  Snow Cover Copyright:  Comment:  Gruvefjellet, Vannledningsdalen, Trollsteinen
Image Of Snow Cover
Image 5 of 6 Of:  Snow Cover Copyright:  Comment:  Fra sukkertoppen mot Hjortfjellet
Image Of Snow Profile
Image 6 of 6 Of:  Snow Profile Copyright: 

Avalanche Problems

Dry slab avalanche Buried weak layer of new snow Within half a meter Difficult to trigger 2 - Medium N, NE, W, NW

Weather

No precipitation -15.5 °C 0 m/s

Avalanche Danger Assessment

2 Moderate Det har blåst inn noe snø fra S. Men både lite vind og lite snø et skredproblem med lite forplatningsevne. Knivfast fokksnø isolorerer kantkornlaget og i denne siden har vi kaún et fokksnøproblem. Dette er nok representativt for alle skredsoner i Longyeardalen. Lite vind og nedbør samt kaldt vær fører vel bare til en sakte stabilisering av fokksnøen. Forecast correct Ser greit ut

Danger Sign

No signs observed

Snow Cover

115 cm in total No snowdrift 0 cm new snow Elevation of new snow 0 masl. Snow line at 0 masl. Layered snow begins at 0 masl Some loose snow (1-10cm) Dry Noe nedbør de siste dagene og vind fra S har blåst inn noe snø i den NV siden på sukkertoppen. Dette er nok representativt for alle lesider for den siste vinden. Den innblåste fokksnøen er av varierende hardhet. I skjerma områder i terrenget i denne siden er fokksnøen myk. Andre steder noe hardere med et innblåst lag med løsere snø under. Men fokksnølaget har liten utbredelse og det er ingen tegn til bruddforplantning i dette laget. Fokksnøen ligger i vestvendte sider på et tykt knivfast lag med fokksnø. Dette gjør at det gamle kantkornlaget i tilknytning til skare (som fortsatt er der) ikke lar seg påvirke. Ellers er snødekket rundt preget av avblåste losider og rygger med noe løssnø i skjerma terrengformer.

Tests

ECTN2@2cmQ3 Good

Snow Profile

8 stratigraphy layers observed 7 temperature points observed 1 Tests connected to snow profile

ObsID: 180714

Nordenskiöld Land / SVALBARD

Snow

11.02.2019 kl. 10:27

25 masl

Martini@unis (****)

Image Of Weather
Image 1 of 2 Of:  Weather Copyright:  Martini@unis Comment:  Mot Adv dalen fra unis
Image Of Weather
Image 2 of 2 Of:  Weather Copyright:  Martini@unis Comment:  Mot Sukkertoppen fra Unis

Weather

Snow -6 °C 5 m/s from S ↑ 100% clouds Lett snø, snøbyger på morgenen mandag. Stigende temperatur igjennom natta. Perioder med lett snøfokk ned i Longyearbyen, men ikke mye løs snø som flyttes.

ObsID: 180289

Nordenskiöld Land / SVALBARD

Snow

10.02.2019 kl. 15:00

150 masl

mnskeyser (Unknown)

Image Of Snow Profile
Image 1 of 2 Of:  Snow Profile Copyright:  mnskeyser
Image Of Snow Profile
Image 2 of 2 Of:  Snow Profile Copyright:  mnskeyser

Avalanche Problems

Buried weak layer of faceted snow above a crust Within half a meter A big and identifiable crystal in the weak layer.

A big and identifiable crystal in the weak layer.

Weather

No precipitation -17 °C 5 m/s from E ←

Snow Cover

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

ObsID: 180185

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.