Avalanche forecast for Nordenskiöld Land Friday 2019-05-17

2
Moderate
Published:

Storm and wind slabs may have been deposited on top of crust and weak layers of fresh snow and facets. Skiers may easily trigger small to medium size avalanches om these layers.

Wind drifted snow (slab avalanches)

Buried weak layer of new 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
Low 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.
2 - Medium
Low additional load
Specific steep slopes
Possible

What are avalanche problems?

Observations the last 3 days (map placed)

0 mm precipitation.
Fresh breeze from northwest.
-5 °C to -2 °C at 700 m a.s.l.
Plus degrees up to 200 m a.s.l. during the afternoon.
Partly cloudy.

For updated info, please visit yr.no
0 mm precipitation.
Breeze from north.
-6 °C to -2 °C at 700 m a.s.l.
Plus degrees up to 100 m a.s.l. during the afternoon.
Clear skies.

For updated info, please visit yr.no

Observations the last 3 days

Nordenskiöld Land / SVALBARD

Snow

16.05.2019 kl. 22:01

629 masl

Audun@unis (***)

Image Of Danger Sign
Image 1 of 1 Of:  Danger Sign Copyright:  Audun@unis

Danger Sign

Whumpf sound Område: I denne fjellsiden. Beskrivelse: Kollapsen skjer under et 13cm lag 1f hard fokksnø flak på et kantkornlag. Dette liker over et 1f fokksnølak på 10cm.

ObsID: 194836

Nordenskiöld Land / SVALBARD

Snow

16.05.2019 kl. 20:39

434 masl

egilg (Unknown)

Image Of Avalanche Observation
Image 1 of 2 Of:  Avalanche Observation Copyright:  egilg
Image Of Avalanche Observation
Image 2 of 2 Of:  Avalanche Observation Copyright:  egilg

Avalanche Observation

16. May 15:41 Dry slab avalanche 2 - Medium Human triggered Buried weak layer of faceted snow near surface 30 cm high and 25 m wide fracture Lee side

Incident

Snow Did not affect anything Backcountry skiing

ObsID: 194911

Nordenskiöld Land / Longyeardalen

Snow

16.05.2019 kl. 13:09

50 masl

Audun@unis (***)

Image Of Snow Cover
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Image 3 of 17 Of:  Snow Cover Copyright: 
Image Of Snow Cover
Image 4 of 17 Of:  Snow Cover Copyright:  Comment:  Haugen
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Image 6 of 17 Of:  Snow Cover Copyright: 
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Image 7 of 17 Of:  Snow Cover Copyright:  Comment:  lia 1
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Image 8 of 17 Of:  Snow Cover Copyright:  Comment:  Lia 3
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Image 9 of 17 Of:  Snow Cover Copyright:  Comment:  Sukkertoppen
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Image 10 of 17 Of:  Snow Cover Copyright:  Comment:  Lia 4
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Image 16 of 17 Of:  Snow Cover Copyright:  Comment:  Platået 6
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Image 17 of 17 Of:  Snow Cover Copyright:  Comment:  Platået 7

Snow Cover

Bilde av snødekke i longyeardalen : Haugen/ Gruvefjellet

ObsID: 194823

Nordenskiöld Land / SVALBARD

Snow

16.05.2019 kl. 12:12

214 masl

Kjetil@obskorps (****)

Image Of Avalanche Activity
Image 1 of 1 Of:  Avalanche Activity Copyright:  Kjetil@obskorps Comment:  To strl 1-2 skred ved svalsatveien. Gått ila natta
ObsID: 194809

Nordenskiöld Land / Svalsatveien, Longyearbyen, Svalbard

Snow

16.05.2019 kl. 10:00

83 masl

elke@unis (***)

Image Of Snow Profile
Image 1 of 2 Of:  Snow Profile Copyright: 
Image Of Avalanche Activity
Image 2 of 2 Of:  Avalanche Activity Copyright:  Comment:  Skredene som har gått siden sist observasjon av Kjetil i går i skålen øst for Svalsatveien. Skredet som gikk over veien har allerede blitt blåst igjen og er vanskelig å se.

Tests

ECTN6@5cmQ3 Medium

Avalanche Activity

Several (6-10). 1 - Small. Spontaneous release N, NE flere flakskred str.1-2 samt noen str. 1 løssnøskred i begge skåler på vei mot Svalsat (skålen ovenfor Skytegropa og skålen øst før Skjæringa) kun den ferske fokksnøen som er gått, de har ikke løst ut noe i det gamle snødekket under

Weather

No precipitation -2.3 °C 4 m/s from SW ↗

Avalanche Problems

Dry slab avalanche Buried weak layer of new snow Within half a meter The overlying slab is soft. Easy to trigger 2 - Medium N, NE Lett å påvirke det svake laget, men ingen tegn til bruddforplantning. Skred vil ikke bli større enn str. 2. Med varslet vær og temperatur bør dette stabilisere seg ganske fort.

Snow Profile

3 stratigraphy layers observed 3 temperature points observed 1 Tests connected to snow profile

ObsID: 194782

Nordenskiöld Land / Larsbreen og Lars Hierta

Snow

15.05.2019 kl. 23:26

662 masl

Kjetil@obskorps (****)

Image Of Snow Cover
Image 1 of 5 Of:  Snow Cover Copyright:  Comment:  ca 250m sett mot sarkofagen
Image Of Snow Cover
Image 2 of 5 Of:  Snow Cover Copyright:  Comment:  ca 250m sett mot gruvefjellet
Image Of Snow Cover
Image 3 of 5 Of:  Snow Cover Copyright:  Comment:  ca 250m sett ned mot nybyen/longyearbyen
Image Of Snow Cover
Image 4 of 5 Of:  Snow Cover Copyright:  Comment:  ca 150m: Fersk fokksnø over eldre fuktig snø.
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Snow Cover

Moderate snow drift Under 400m: Fersk, og og etpar dager gammel fokksnø over skitten gammel hard snø. Rabber og solpåvirkede områder er bare. Finner ikke kantkorn under 400m, men fokksnøproblem i leområder. Over 400m: Mere fokksnø i leområder, og også et kantkornproblem under dette i noen områder.

Avalanche Danger Assessment

3 Considerable Med et strl 2 skred i NØ sektor kan man tenke seg at det i regionen er flere av dette. Det er sannsynligvis en kombinasjon av fersk fokksnø og step-down til et kantkornlag som i enkelte/noen områder er potent, og i andre områder har fått mer varme og er litt mer avrundet. Med denne ferske fokksnøen har det i løpet av dagen kommet opp i FG3. Fokksnøproblemet vil stabiliseres, kantkorn som er mest potent i noen/enkelte områder over 400m vil vedvare. Fokksnø-problemet er i høyeste grad tydelig og burde vært med.

Danger Sign

Whumpf sound Drønn fra ca 200m og opp. Nederst er dette fokksnø. Oppå Larsbreen og videre kan det være både fokksnø og kantkorn.

Avalanche Problems

Dry slab avalanche Buried weak layer of faceted snow beneath a crust 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. Easy to trigger 2 - Medium N, NE, E, SE, S, SW, W, NW above 400 masl Dette kantkornproblemet virker å være fra 400m og opp. I lupa ser jeg at enkelte områder er kornene avrundet, og enkelte områder er de ikke så varmepåvirket. Virker å være mest potent høyere opp og der dette laget er tynt.

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. The overlying slab is soft. Very easy to trigger 2 - Medium N, NE, E

Tests

ECTN1@5cm Poor Skytende sprekker. Får bruddforplantning der flaket er tykt/hardt nok til det.

Snow Profile

5 stratigraphy layers observed 1 Tests connected to snow profile

ObsID: 194735

Nordenskiöld Land / SVALBARD

Snow

15.05.2019 kl. 16:50

291 masl

Kjetil@obskorps (****)

Image Of Avalanche Observation
Image 1 of 1 Of:  Avalanche Observation Copyright:  Kjetil@obskorps

Avalanche Observation

15. May 15:50 Dry slab avalanche 2 - Medium Naturaly released NE-facing Buried weak layer of new snow 10 cm high and 100 m wide fracture Nedre del av svalsatvei

ObsID: 194721

Nordenskiöld Land / SVALBARD

Snow

15.05.2019 kl. 09:12

444 masl

Kjetil@obskorps (****)

Image Of Notes
Image 1 of 1 Of:  Notes Copyright:  Kjetil@obskorps

Notes

Det har kommet litt fersk fokksnø fra sørvest i natt. Ikke store mengder. Av kun dette vil det bli strl 1 og mulig strl 2 skred. Lett å påvirke.

ObsID: 194684

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.