Avalanche forecast for Vest-Telemark Sunday 2020-12-13

Highest danger level per day:
2
Moderate
Published:

Be careful in lee areas with wind deposited snow, typically behind ridges, ribs and in gullies.

Illustrasjon av ferdselsråd Aviod terrain steeper than 30 degrees with fresh wind slabs.
Illustrasjon av ferdselsråd Avoid terrain traps.

Wind drifted snow (slab avalanches)

Buried weak layer of new snow

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

What are avalanche problems?

Observations the last 3 days (map placed)

2-4 mm precipitation.
Fresh breeze from east, changing to breeze from the east during the afternoon.
-6 °C to -3 °C at 1100 m a.s.l.
Cloudy.

For updated info, please visit yr.no
3-5 mm precipitation.
Breeze from east, changing to fresh breeze from the southeast during the evening.
-4 °C to -1 °C at 1100 m a.s.l.
Cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Vest-Telemark / Raulandsfjell

Snow

13.12.2020 kl. 11:42

1142 masl

svein@obskorps (****)

Image Of Snow Profile
Image 1 of 5 Of:  Snow Profile Copyright: 
Image Of Snow Cover
Image 2 of 5 Of:  Snow Cover Copyright: 
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Image 3 of 5 Of:  Snow Cover Copyright: 
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Avalanche Problems

Dry slab avalanche Poor bonding between layers in wind deposited snow Within half a meter The overlying slab is soft. Difficult to trigger 1 - Small S, SW, W above 1000 masl

Dry slab avalanche Buried weak layer of faceted snow near the ground Within half a meter Difficult to trigger 2 - Medium N, NE, E, SE, S, SW, W, NW above 1000 masl

Avalanche Danger Assessment

2 Moderate Stort sett stabile forhold i Raulandsområdet, men vær forsiktig i områder med fersk fokksnø i bratte heng og renner. Det er meldt snø og en del vind fra sørøst i fjellet i morgen. Dette vil føre til ustabil fokksnø i vestlige heng. Forecast correct

Weather

No precipitation -1 °C 2 m/s from NE ↙ 100% clouds

Danger Sign

Recent snowdrift

Tests

LBTQ3 Medium Blokken løsner i fuktig kantkorna lag ved bakken.

Snow Cover

40 cm in total No snowdrift 2 cm new snow Some loose snow (1-10cm) Dry Det er fortsatt en del løssnø å finne i skogen, over skoggrensa er det en blanding av fokksnø og løssnø. Fokksnøen har stort sett stabilisert seg. I høyden, under det gamle harde snødekket finnes det fuktig kantkorna snø.

Avalanche Activity

13. Dec. During the day No avalanche activity

Snow Profile

1 cm K IFrc 0 mm/0 mm, 3 cm F DF 0 mm/0 mm D, 1 cm K IF 0 mm/0 mm, 20 cm 1F DF 0 mm/0 mm D, 15 cm P MF 0 mm/0 mm D, 10 cm 1F FC 1 mm/0 mm M

ObsID: 244839

Vest-Telemark / Vinje

Snow

13.12.2020 kl. 11:30

1006 masl

Lasse (Unknown)

Image Of Snow Profile
Image 1 of 1 Of:  Snow Profile Copyright:  Lasse Comment:  Blokken ligger på hodet og viser glatt flate som lå mo hardt lag.

Danger Sign

Whumpf sound

Snow Profile

50 cm myk snø på 30 cm hard lag. Sukker nederst. Dårlig heft mellom myk og hard snø.

ObsID: 244862

Vest-Telemark / Vinje

Snow

12.12.2020 kl. 11:00

1134 masl

Lasse (Unknown)

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

Snow Cover

Crust

ObsID: 244763

Vest-Telemark / Vinje

Snow

10.12.2020 kl. 11:22

1137 masl

håkon@obskorps (***)

Image Of Weather
Image 1 of 2 Of:  Weather Copyright:  håkon@obskorps
Image Of Snow Cover
Image 2 of 2 Of:  Snow Cover Copyright:  håkon@obskorps Comment:  Viser snødekket

Avalanche Problems

Dry slab avalanche Buried weak layer of faceted snow near the ground Within half a meter A big and identifiable crystal in the weak layer. Difficult to trigger 3 - Large S, SW, W, NW Ligger i fordypninger og le sider der det ligger eldre snø.

Dry slab avalanche Poor bonding between layers in wind deposited snow Within half a meter The collapsing weak layer is thin < 3 cm. Easy to trigger 1 - Small SW, W, NW

Avalanche Danger Assessment

2 Moderate Lommer med kantkorn under gammelt snødekke mot bakken, i terreng senkinger og leheng. Forventes og holde stabilt det er medlt et par minus og ikke nedbør av betydning. Forecast correct

Weather

No precipitation -3 °C 6 m/s from E ← 100% clouds

Danger Sign

Whumpf sound Område: Generelt på fjellet. Beskrivelse: Kollapser nede ved bakken.

Tests

CTE3@20cmQ2 Poor Dårlig binding i fokksnøen

Snow Cover

30 cm in total No snowdrift 2 cm new snow Some loose snow (1-10cm) Dry

Avalanche Activity

10. Dec. During the day No avalanche activity Flatt lys og begrensa sikt.

ObsID: 244537

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.