8 Snø observasjoner ved (Nordenskiöld Land/SVALBARD).
Observert av
HoltH@unis
Kompetanse
*** (Kurset observatør. Observatøren har erfaring med å vurdere snøskredfare. Observatøren har grunnleggende kurs eller tilsvarende erfaring om bruk av regObs og Varsom. Kompetansen tilsvarer NVE sitt nivå 4a.)
Tidspunkt observert
14. februar 2019 kl. 14:46
Tidspunkt registrert
Sist endret

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Faretegn
Type
Kommentar
Ingen faretegn observert
Skredaktivitet
Dato
14.02.2019
Antatt tidsrom
0-23
Antall skred
Ingen skredaktivitet
Kommentar
ingen ferske skred i det siste...
Værobservasjon
Temperatur
-19,00 °C
Vindhastighet
2,0 m/s
Vindretning
Fra nord
Skydekke
0 %
Kommentar
klart, kaldt, stabilt, og nydelig vær
Snødekke
Total snødybde
150 cm
Nysnø siste døgn
0 cm
Snøgrense
0 moh
Snøfokk
Ikke snøfokk
Snøfuktighet
Tørr
Snødekkehardhet
Litt tørr løssnø (1-10cm)
Kommentar
Between 1,5 m and 2,0 m snow above 400 moh on the western aspect of Ottofjellet. Light snow showers on Monday deposited up to 10 cm of snow in leeward areas that, in this location at least, remains relatively unaffected by the wind. In other locations, I have observed this snow developing into unreactive wind slabs. Under the fresh snow, I found a conditionally stable, dense snowpack that is actively faceting in the upper 50 cm due to strong temperature gradients.

Himmelretning
NV
Kommentar
Arctowskifjellet / Albert Bruntoppen / Kreklingpasset area from Ottofjellet.
Himmelretning
V
Kommentar
Ottofjellet's western aspect from Tellbreen. Pit location is marked with the nice robin's egg blue dot.
Himmelretning
Ø
Kommentar
East down Blekumbreen towards Hiortfjellet.
Stabilitetstest
Test
ECTN 14@27cm
Inkluder i profil
Ja, stabilitetstesten vises i snøprofil.​
Skredproblem
Type svakt lag
Kantkornet snø over skarelag
Avstand fra overflaten til det svake laget
Innen en halv meter
Ugunstige egenskaper på det svake laget
Det overliggende laget er mykt.
Utløsbarhet
Vanskelig å løse ut
Størrelse på forventet skred
2 - Middels
Utbredelse løsneområder
Ikke gitt
N
V
Ø
S
Eksposisjon
Kommentar
The only avalanche problem I observed on this observation trip is a layer of facets sandwiched between two very dense, hard windslabs (that are also faceting themselves). This layer is thick and not shearing cleanly or propagating in stability tests. I did not observe the obvious facet / crust / facet stratigraphy that we have been following throughout the region in this location (and at this elevation) - instead, this faceted layer seems to be a lower density wind slab that is readily faceting with strong temperature gradients. So I am a bit unsure if I selected the right type of weak layer from the drop-down menu above but I would classify this as a "developing layer of facets within the snowpack". Unsure of the regional distribution of this particular layer, but observed throughout the western aspect I investigated on this trip.
Skredfarevurdering
Skredvurdering
I observed stable conditions on my trip today, with no obvious signs of instability. Cold air is inducing relatively strong temperature gradients in the snowpack and promoting faceting, but this does not appear to be a problem without large additional loads (i.e. conditionally stable). Based on this trip today, we are very close to FG 1, but a moderate rating is still probably ok with reports of considerably more snow with the potential for wind slab development further south.
Utvikling
Continued cold, clear weather will promote facet development in the upper portions of the snowpack. In particular, low density fresh snow at the surface will facet readily and, combined with the harder layer underneath, form a good weak layer / bed surface stratigraphy for future avalanche activity. We are also getting into a period of diurnal temperature fluctuations with the return of the sun, which also promote faceting in the surface snow.
Faregrad
faregrad 2 Moderat
Varselets riktighet
Varslet faregrad er riktig
Kommentar
looks great.
Snøprofil


Himmelretning
SV
Kommentar
Generally faceted snowpack. Very little change in grain form below around 90 cm, with layering here manifesting as relatively subtle changes in hardness. Lower density layers below the uppermost layer of facets were completely unreactive in stability tests. Pit is representative for western aspects above 400 m north of adventdalen.
Stedsinformasjon
Laster kart
wait image
Varslingsregion
Nordenskiöld Land
Kommune
SVALBARD
Posisjoneringskilde
GPS i smartPhone
Moh
591 
+/- nøyaktighet
5 meter
Laster kart