Avalanche forecast for Vest-Telemark Monday 2020-12-14

Highest danger level per day:
3
Considerable
Published:

The danger increases when the wind picks up. Avoid 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 and runout zones.
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
Widespread steep slopes
Possible

What are avalanche problems?

Observations the last 3 days (map placed)

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
18 mm precipitation, up to 25 mm in the most exposed areas.
Strong breeze from southeast, changing to breeze from the south 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 / Valle

Snow

14.12.2020 kl. 12:31

916 masl

ElisabethS@Obskorps (***)

Image Of Tests
Image 1 of 6 Of:  Tests Copyright:  ElisabethS@Obskorps
Image Of Tests
Image 2 of 6 Of:  Tests Copyright:  ElisabethS@Obskorps
Image Of Tests
Image 3 of 6 Of:  Tests Copyright:  ElisabethS@Obskorps Comment:  Øverste er @9 og det nr2 er @11 på 20cm
Image Of Snow Profile
Image 4 of 6 Of:  Snow Profile Copyright:  ElisabethS@Obskorps
Image Of Weather
Image 5 of 6 Of:  Weather Copyright:  ElisabethS@Obskorps Comment:  Tung snø, hellingen ligger i le for vinden
Image Of Snow Cover
Image 6 of 6 Of:  Snow Cover Copyright:  ElisabethS@Obskorps

Avalanche Activity

14. Dec. During the day No avalanche activity

Snow Cover

70 cm in total Some snow drift 20 cm new snow Elevation of new snow 490 masl. Snow line at 480 masl Wet loose snow Moist Våt nysnø

Notes

I bratte heng mer enn 30% så kommer det snøballer ned.

Avalanche Danger Assessment

3 Considerable Det er svake lag i snøen. Det er vintransport og moderat pålagring av snø. I rette hellinger kan det utløses naturlige skred, kan også løses ut av skiløper. Det snør og blåser godt på 900moh. Snøen som kommer ned var delevis nedbrutt og fuktig. Det er moderat vindtransport i lesider som fører til mye oppsamling av snø. Forecast correct Rett

Tests

ECTP11@20cmQ2 Medium

ECTP9@13cmQ2 Medium Brudde forblanter seg men kun i det øverste laget med nysnø. Det kolapser/synker sammen

LBT@40cmQ2

Weather

Snow -1.5 °C 8 m/s from E ← 100% clouds

Danger Sign

No signs observed

Avalanche Problems

Dry slab avalanche Buried weak layer of new snow Within half a meter The overlying slab is soft. Difficult to trigger 1 - Small N, S, SW, W, NW above 500 masl Snøen som kommer i dag er tung. Det er mye vind og en del vindtransport som fører til moderat pålagring

Snow Profile

16 cm F DF/PP 1 mm M, 5 cm 1F RG 1 mm D, 5 cm F DF 1 mm D, 107 cm P RG 1 mm M -1.7 °C @ 133 cm 2 tests connected to snow profile

ObsID: 244958

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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Image 4 of 5 Of:  Snow Cover Copyright: 
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Image 5 of 5 Of:  Snow Cover Copyright: 

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

Tests

LBTQ3 Medium Blokken løsner i fuktig kantkorna lag ved bakken.

Weather

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

Danger Sign

Recent snowdrift

Avalanche Activity

13. Dec. During the day No avalanche activity

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 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

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

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.