Avalanche forecast for Nordenskiöld Land Friday 2019-02-01

2
Moderate
Published:

Be careful in lee areas with fresh storm slabs. A persistent weak layer of facets may also be triggered, especially where the snow cover is thin.

Illustrasjon av ferdselsråd Be careful in steep slopes and around terrain traps 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.
Illustrasjon av ferdselsråd 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.

New snow (slab avalanches)

Buried weak layer of new snow

Read more about the avalanche problem
2 - Medium
Low additional load
Specific steep slopes
Possible

Persistent weak layer (slab avalanches)

Buried weak layer of faceted snow near surface

Read more about the avalanche problem
3 - Large
High additional load
Isolated steep slopes
Possible

What are avalanche problems?

Observations the last 3 days (map placed)

Cloudy.

For updated info, please visit yr.no
Cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Nordenskiöld Land / Sukkertoppen

Snow

01.02.2019 kl. 13:43

130 masl

HoltH@unis (***)

Image Of Snow Cover
Image 1 of 1 Of:  Snow Cover Copyright: 

Snow Cover

Sukkertoppen snow cover / snow depths from terrestrial laser scanning on 2019-01-30. Snow cover represented in this figure corresponds well with the photos of Sukkertoppen from: https://www.regobs.no/Registration/178253. Relatively little snow across most of Sukkertoppen's western aspect, except for the upper start zone and around the snow fences. The black dot indicates the location of the DRIVA snow depth measurement station. No snow accumulations in excess of 2 meters except for right around the snow fences.

ObsID: 178709

Nordenskiöld Land / Svalsatveien

Snow

01.02.2019 kl. 10:30

377 masl

MariE (Unknown)

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

Weather

No precipitation -4.6 °C 9 m/s from S ↑ 70% clouds

Snow Cover

220 cm in total No snowdrift 0 cm new snow Crust Dry Snødekket er generelt hardt, dominert av hard fokksnø, men vi finner også islag/skarelag med kantkorn både over og under denne skaren. I helt isolerte lommer finnes myk fokksnø, med dårligere binding til gammel fokksnø/skare, men observerte dette kun der fresen har lagt igjen hauger som gir le for vinden (så finnes nok i leområder andre steder). Vi fikk brudd i det tynne kantkornlaget over skare på ECTP16@75.

Danger Sign

No signs observed

Tests

ECTP16@42cmQ2 Medium

Avalanche Danger Assessment

2 Moderate observasjonen gjelder for Svalsatveien/Skjæringa og er ikke representativt for regionen. Generelt avblåst, finner noe myk fokksnø i isolerte leområder, som fortsatt viste tegn til å sprekke opp når vi gikk over. Observert kantkornlag over og under skare, men skal mye til å komme gjennom harde is og skarelag for å nå ned til disse. værvarselet gir ingen indikatorer på en økende skredfare nå. Forecast correct

Avalanche Problems

Dry slab avalanche Buried weak layer of faceted snow above a crust Within a meter The collapsing weak layer is thin < 3 cm. Difficult to trigger N, NW tydelige kantkorn, i tynt lag over skare. Skal høy belastning til for å løse ut. Her tykt overliggende lag med hard fokksnø og islag. Kan være et problem der snødekket er tynt.

Snow Profile

9 cm P RG 1 mm/0 mm, 8 cm P RG 0 mm/0 mm, 7 cm 1F RG/RGxf 1 mm/0 mm, 17 cm P MF/RG 1 mm/2 mm, 1 cm 4F FC 1 mm/0 mm Skarelag, 1 cm I MFcr 0 mm/0 mm, 5 cm 4F FC 0 mm/0 mm, 49 cm P RG 0 mm/0 mm, 20 cm P RG 0 mm/0 mm -9.7 °C @ 0 cm, -10 °C @ 10 cm, -10 °C @ 30 cm, -10 °C @ 50 cm, -10 °C @ 70 cm, -9.3 °C @ 80 cm, -9 °C @ 90 cm, -7.9 °C @ 100 cm, -7.3 °C @ 110 cm, -7 °C @ 117 cm, -6.4 °C @ 118 cm 1 test connected to snow profile

ObsID: 178687

Nordenskiöld Land / Larsbre Øst

Snow

31.01.2019 kl. 20:00

547 masl

Kjetil@obskorps (****)

Image Of Snow Profile
Image 1 of 3 Of:  Snow Profile Copyright: 
Image Of Tests
Image 2 of 3 Of:  Tests Copyright:  Comment:  Snøprofilen i virkeligheten
Image Of Tests
Image 3 of 3 Of:  Tests Copyright:  Comment:  Q1

Weather

-5 °C 5 m/s from E ←

Snow Cover

Det har ila de siste par dagene lagt seg endel fokksnø i vestvendte heng. Fra omlag 5 til 30 med 4f til 1f. Under dette er det som registrering 178146

Danger Sign

No signs observed

Tests

ECTP6@17cmQ1 Poor

Avalanche Danger Assessment

2 Moderate Observasjon tatt for område Longyearbyen. Et stabiliserende fokksnøproblem over et vedvarende kantkornproblem. Alle høyder i Vest-lig sektor. Mulig step-down. Med vinddreining til sør, og etter svalbardforhold endel snø tilgjengelig så vil fokksnøproblemet også komme i norlig sektor. Forecast correct

Avalanche Problems

Dry slab avalanche Poor bonding between layers in wind deposited snow Within half a meter The overlying slab is soft. Easy to trigger 2 - Medium N, NE, SW, W, NW Fokksnøproblemet er der enda, men har stabilsert seg noe fra onsdagen.

Dry slab avalanche Buried weak layer of faceted snow above a crust The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. Easy to trigger 3 - Large N, NE, SW, W, NW Dette kantkornproblemet finnes over alt, men varierende grad av hvor begravet det er. Det er enten få områder og lett å løse ut, eller noen og vanskelig å løse ut.

Snow Profile

5 cm 4F DF 0 mm/0 mm, 7 cm 1F DF 0 mm/0 mm, 5 cm P RG 0 mm/0 mm, 1 cm 4F FC 1 mm/0 mm, 1 cm K/1F MFcr 0 mm/0 mm, 1 cm 4F FC 1 mm/0 mm, 1 cm P MFcr 0 mm/0 mm, 13 cm 1F RGxf 1 mm/0 mm, 33 cm P RGxf 1 mm/0 mm, 3 cm K IF 0 mm/0 mm, 2 cm 1F FC 2 mm/0 mm, 25 cm P MF 0 mm/0 mm, 5 cm 1F FC 2 mm/0 mm 1 test connected to snow profile Temperaturen i profilen er ikke riktig.

ObsID: 178619

Nordenskiöld Land / SVALBARD

Snow

31.01.2019 kl. 12:35

545 masl

HoltH@unis (***)

Image Of Snow Cover
Image 1 of 5 Of:  Snow Cover Copyright:  HoltH@unis Comment:  soft snow surface.
Image Of Snow Profile
Image 2 of 5 Of:  Snow Profile Copyright: 
Image Of Snow Profile
Image 3 of 5 Of:  Snow Profile Copyright: 
Image Of Snow Cover
Image 4 of 5 Of:  Snow Cover Copyright:  Comment:  mot helvetiafjellet / adventdalen
Image Of Snow Cover
Image 5 of 5 Of:  Snow Cover Copyright:  Comment:  adventalen mot gruve 7

Weather

Snow -5 °C 5 m/s from E ← 50% clouds Broken clouds most of the morning / early afternoon. Light snow on Arctowskifjellet between 1130 and 1330. Light easterly winds, fairly warm air.

Snow Cover

125 cm in total Some snow drift 0 cm new snow Snow line at 0 masl Storm slab (soft slab) Dry Variable snow cover as normal for Spitsbergen. The easterly winds over the past few days have had their way with the snow cover, moving most of the fresh snow into wind deposits on westerly aspects. On Arctowskifjellet, 1F wind slabs 10-50 cm deep lie in most leeward locations. Ridges and easterly aspects I observed were blown back down to the most recent melt freeze crust. Wind has densified the most recent snow to the point that most of the snow from this week is now no longer readily available for wind transport.

Danger Sign

Whumpf sound Område: I denne fjellsiden. Beskrivelse: Bare et drønn på veien opp rundt 250 moh

Avalanche Danger Assessment

2 Moderate Based on my observation trip today, I came up with the following inputs to ADAM: Fokksnø problemet: mulig utløsningssannsynlighet to str. 2. Vedvarende svakt lag problemet: lite sannsynlig to str. 3. This gives a moderat (2) rating. With continued mild weather, the wind slab problem should continue to stabilize in the absence of strong winds or more precipitation. Mild weather won't make the faceted layers worse, but looks like we are probably stuck with a persistent weak layer problem for the foreseeable future. Forecast too high The forecast for today describes the avalanche problems well. It's possible that more snow has fallen and wind slab problems are worse further south in the region, but based on my observations in this location today, a moderate rating seems more appropriate.

Avalanche Activity

31. Jan. During the day (+01:00) No avalanche activity

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. Very difficult to trigger 3 - Large SW, W, NW So far I have only observed this avalanche problem on westerly aspects, so am a little unsure of its distribution regionally. Observed well-developed facets both over and under the most recent melt-freeze crust in the snowpack. In stability tests, the slightly larger facets under the crust were more reactive. In a modified ECT in which I removed the top 30 cm of wind slab and tested the facet layers specifically, i was able to get the facet layer under the crust to propagate after 19 (ECTP 19). However this layer is well-bridged by the hard melt-forms over it and I think it would be fairly difficult to trigger an avalanche on this layer. Nevertheless, in the event that this layer was affected by a skier, snowmobiler, or a smaller wind slab avalanche, this layer has the potential to produce sizable avalanches. Low probability / high consequence scenario.

Dry slab avalanche Poor bonding between layers in wind deposited snow Within half a meter The collapsing weak layer is thin < 3 cm. Difficult to trigger 2 - Medium SW, W, NW Wind slabs from earlier in the week appear to be stabilizing nicely, based on my observations. Stability tests show that it is possible to initiate a fracture in the fresh wind slabs, but these fractures are not propagating. Stomping on fresh drifts did not yield any signs of instability. In general, the wind slabs in this location felt fairly dense, homogenous, and decently well bonded.

ObsID: 178571

Nordenskiöld Land / SVALBARD

Snow

30.01.2019 kl. 19:09

663 masl

HoltH@unis (***)

Image Of Snow Cover
Image 1 of 1 Of:  Snow Cover Copyright:  HoltH@unis Comment:  West aspect about 400 moh. 30 cm accumulation. 4F+ hardness slab.

Weather

Snow -5 °C 8 m/s from E ← 60% clouds Snowing S-1 for the two hours I was out. Sky was broken clouds, some stars visible. Calm conditions on Longyearbreen, moderate easterly winds above 500 moh.

Snow Cover

Moderate snow drift 5 cm new snow Much loose snow (10-30cm) Dry Strongly aspect dependent snow cover. Wind has moved the snow around quite a bit in the past 48 hours. Westerly aspects have up 50 cm wind deposited snow since Sunday. Most western aspects I observed had between 20-30 cm snow accumulation in the past 48 hours. Eastern aspects I observed (Lars Hiertafjellet to Larsbreen) are mostly stripped by the wind to the old snow surface.

Avalanche Problems

Dry slab avalanche Poor bonding between layers in wind deposited snow Within half a meter The collapsing weak layer is thin < 3 cm. The overlying slab is soft. SW, W, NW I only conducted quick handshear tests while skinning up. Handshears breaking cleanly down 20 cm from the surface on a density change in the new snow in the deeper accumulations. Unsure how widespread this problem is. I didn't see any other signs of instability in the new snow, but also avoided avalanche terrain. It does seem that the new wind deposits are stabilizing fairly quickly due to the absence of shooting cracks etc even when stomping on ridgetop cornices, but I didn't trust the new snow enough to ski over 30 degrees this evening.

ObsID: 178440

Nordenskiöld Land / Longyearbyen

Snow

30.01.2019 kl. 15:45

25 masl

Martini@unis (****)

Notes

Mer snø SØ i regionen enn i Lyb. I går var det kraftig snøfokk og mye nedbør i Svea. Stengt vei over Marthabreen til Lunckefjellet pga ikke klarte å holde veien åpen med brøyting. I Fardalen rapporteres det om stedvis mye løs, ubunden snø, noen plasser med >50 cm.Registration/178264 viser 10-15 cm nysnø på Longyearbreen i går kveld. I Longyearbyen så roet været seg i går ettermiddag, lite vind og ingen nedbør. Ingen nedbør i dag i Longyearbyen. Oppsummert: Til dels mye løs snø tilgjengelig for transport, mer i Østlig og Sørlig del av regionen. I Longyearbyen område ingen nedbør så lang i dag, vind i høyden. Snøfokk i terrenget og vi får pålagring hovedsakelig i vest vendt terreng. Sjikt i fokksnø / ned føyka nysnø er hovedproblem i dag og morgen. Utbredelse noen brattheng,lett å løse ut/ moderat på lagring, svekkelse i dag. Forventa str. 2. Pga. kantkorn problemet i snødekke så kan skred som går i fokksnø påvirke vedvarende svakt lag med » step down» og forventa skred str 3 – store. FG 3 i dag og i morgen.

ObsID: 178414

Nordenskiöld Land / SVALBARD

Snow

29.01.2019 kl. 18:30

450 masl

HoltH@unis (***)

Weather

Snow -5 °C 8 m/s from E ← 100% clouds Nesten vindstille på Longyearbreen, vindfullt på ryggen opp mot Lars Hierta.

Snow Cover

Moderate snow drift 10 cm new snow Much loose snow (10-30cm) Mellom 5-20 cm nysnø det siste døgnet. Flak (4F) dannelse i leområder opp til 25 cm. New snow is upside down where affected by the wind.

ObsID: 178264

Nordenskiöld Land / Sukkertoppen løsneområde

Snow

29.01.2019 kl. 16:44

142 masl

Kjetil@obskorps (****)

Image Of Snow Cover
Image 1 of 9 Of:  Snow Cover Copyright:  Comment:  Sukkertoppen
Image Of Snow Cover
Image 2 of 9 Of:  Snow Cover Copyright:  Comment:  Sørlig del av sukkertoppen
Image Of Snow Cover
Image 3 of 9 Of:  Snow Cover Copyright:  Comment:  over nybyen
Image Of Snow Cover
Image 4 of 9 Of:  Snow Cover Copyright:  Comment:  Nybyen mot sør øst
Image Of Snow Cover
Image 5 of 9 Of:  Snow Cover Copyright:  Comment:  Gruve 2b
Image Of Snow Cover
Image 6 of 9 Of:  Snow Cover Copyright:  Comment:  Sverdrupbyen
Image Of Snow Cover
Image 7 of 9 Of:  Snow Cover Copyright:  Comment:  Veien til sverdrupbyen
Image Of Snow Cover
Image 8 of 9 Of:  Snow Cover Copyright:  Comment:  Platåfjellet
Image Of Snow Profile
Image 9 of 9 Of:  Snow Profile Copyright: 

Weather

Snow -5 °C 10 m/s from E ← 100% clouds Snøbyger, og litt snøfokk

Snow Cover

Rundt Longyearbyen er det forholdsvis lite snø. Registrasjon 178146 gjelder enda, bare at nå har det kommet litt fokksnø oppå i veslige le-heng. Kantkornproblemet som jeg i går mente var værst over 400m finner jeg også nå på 100m. Så i alle høyder.

Danger Sign

Recent snowdrift

Tests

ECTP20@29cmQ1

Avalanche Danger Assessment

2 Moderate Gjelder Longyearbyen. Foreløpig lite snø. Kantkornproblem hele veien opp, litt vanskelig å løse ut, men om det kommer blir det store skred. Med mer snø og pålagring nå så har vi en økende fokksnøproblem

Avalanche Problems

Dry slab avalanche Poor bonding between layers in wind deposited snow Within half a meter Easy to trigger 2 - Medium N, SW, W, NW begynner nå etterhvert å bli et fokksnøproblem. Ikke ille enda fra sukkertoppen, men man kan tenke seg at dette forverrer med mer vindtransport

Dry slab avalanche Buried weak layer of faceted snow near surface Within half a meter The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. Difficult to trigger 3 - Large N, SW, W, NW above 0 masl Dette kantkornproblemet er hele veien fra 0 meter og opp. Mulig verre i vestlig sektor.

Snow Profile

3 cm F PP 0 mm/0 mm, 23 cm 1F-P /1F+ RG 0 mm/0 mm, 3 cm 4F FC 1 mm/0 mm, 10 cm P RG 1 mm/0 mm, 3 cm 4F FC 2 mm/0 mm, 27 cm K MF 0 mm/0 mm 1 test connected to snow profile

ObsID: 178253

Nordenskiöld Land / Todalen

Snow

29.01.2019 kl. 12:04

100 masl

Martini@unis (****)

Weather

Snow -4 °C from E ← 100% clouds 10m/s ute i Adventdalen fra øst, tett snøfokk. Nært vindstille inne Todalen, men tett snøvær

Snow Cover

Some snow drift 15 cm new snow Much loose snow (10-30cm) Dry Rapport fra UNIS scooterkurs som har kjørt UNIS-Todalen - UNIS. Kraftig snøfokk ute i Adventdalen. Inne i Todalen er man i le og mindre vind < 5m/s, der har det kommet opptil 15 cm nysnø siste døgn og det snør fortsatt. I vestvendt del av elveleiet har det lagt seg opp opptil 1 meter med myk vindpakket / nysnø. Nedsynk til hofta til fots. Dette gjelder for noen områder i vestvendt sider i elveleiet i Todalen

ObsID: 178219

Nordenskiöld Land / SVALBARD

Snow

29.01.2019 kl. 11:54

25 masl

KeyserLRKHSkredgruppe (Unknown)

Image Of Weather
Image 1 of 1 Of:  Weather Copyright:  mnskeyser Comment:  Bra sikt i byen, men ute i Adventdalen kjørte man fra brøytestikke til brøytestikke utover i morges.

Weather

Snow -4 °C 11 m/s from E ← Snø og fokk i Longyearbyen

ObsID: 178214

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.

For slope angle maps, download the app Varsom Regobs on App Store | Google Play or see our slope angle map at senorge.no ("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.