Avalanche forecast for Vest-Telemark Sunday 2019-03-17

3
Considerable
Published:

Wind and fresh snow may give instable conditions. Be careful in lee areas with wind deposited snow, typically behind ridges, ribs and in gullies. Especially where the wind deposited slabs are thin or soft, a slab avalanche is easier to trigger there. Especially avoid convex terrain.

New snow (slab avalanches)

Buried weak layer of new snow

Avoid terrain traps and steep slopes 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.
2 - Medium
Spontaneous release
Widespread steep slopes
Possible

Persistent weak layer (slab avalanches)

Buried weak layer of faceted snow near surface

Avoid skiing in avalanche terrain (steep terrain more than 30 degrees and in runout zones). NB, remote triggering is likely. 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, cracking and recent avalanches. However, absence of signs does not mean it is safe.
2 - Medium
High additional load
Isolated steep slopes
Possible

What are avalanche problems?

Observations the last 3 days (map placed)

1 mm precipitation.
Fresh breeze from west., change to fresh breeze from the southeast during the evening.
-8 °C to -1 °C at 1100 m a.s.l.
Plus degrees up to 600 m a.s.l. during the afternoon.
Partly cloudy.

For updated info, please visit yr.no
25 mm precipitation, up to 35 mm in the most exposed areas.
Moderate gale from southeast., change to fresh breeze from the north during the afternoon.
-6 °C to -1 °C at 1100 m a.s.l.
Plus degrees up to 500 m a.s.l. during the afternoon.
Cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Vest-Telemark / VINJE

Snow

17.03.2019 kl. 08:57

985 masl

Rolf B. (**)

Snow Cover

100 cm in total Some snow drift 5 cm new snow Some loose snow (1-10cm) Dry

Weather

-4 °C 10 m/s from E ← 100% clouds

Avalanche Danger Assessment

Riktige

ObsID: 186649

Vest-Telemark / Gaustatoppen

Snow

16.03.2019 kl. 13:30

1844 masl

andre@forsvaret (***)

Image Of Snow Profile
Image 1 of 1 Of:  Snow Profile Copyright:  andre@forsvaret.no Comment:  Steinhardt islag på 10 cm i topp. Kun føyka snø på et par cm over dette. Flere lag med knivhard is under dette. Det svakeste laget i bunn er med hardhet «fist» og ser ut til å være melt-freeze-forms. Ingen depth hoars observert.

Snow Cover

ObsID: 186582

Vest-Telemark / Raulandsfjell

Snow

16.03.2019 kl. 12:17

1209 masl

svein@obskorps (****)

Image Of Weather
Image 1 of 5 Of:  Weather Copyright:  Comment:  1200moh
Image Of Snow Cover
Image 2 of 5 Of:  Snow Cover Copyright:  Comment:  1200moh
Image Of Snow Profile
Image 3 of 5 Of:  Snow Profile Copyright: 
Image Of Snow Profile
Image 4 of 5 Of:  Snow Profile Copyright: 
Image Of Avalanche Problems
Image 5 of 5 Of:  Avalanche Problems Copyright: 

Snow Cover

80 cm in total No snowdrift 5 cm new snow Storm slab (soft slab) Dry Snøen som kom i uka er fremdeles løs og ubunden der sola ikke har tatt for mye. I solsidene er det vanskelig skiføre med smelt/frys skare. Over skoggrensa er det myke flak med fokksnø som preger snødekket. Snøen har bundet seg godt til det gamle harde snødekket. Det er og gode bindinger innad i fokksnøen.

Weather

No precipitation -1 °C 2 m/s from N ↓ 10% clouds

Avalanche Danger Assessment

1 Low Stabile forhold i Raulandsområdet akkurat nå. Stort sett gode bindinger innad i fokksnøen. Ingen skred observert. Mye snø og vind de nærmeste dagene vil gjøre at skredfaren øker betraktelig.

Danger Sign

No signs observed

Avalanche Problems

Dry slab avalanche Poor bonding between layers in wind deposited snow Within half a meter Difficult to trigger 1 - Small N, W, NW above 1000 masl

Tests

ECTN12@20cmQ2

Avalanche Activity

16. Mar. During the day (+01:00) No avalanche activity

Snow Profile

4 stratigraphy layers observed 1 Tests connected to snow profile

ObsID: 186587

Vest-Telemark / VINJE

Snow

16.03.2019 kl. 11:00

1187 masl

Espen@rkh (Unknown)

Image Of Danger Sign
Image 1 of 2 Of:  Danger Sign Copyright:  Espen@rodekors
Image Of Danger Sign
Image 2 of 2 Of:  Danger Sign Copyright:  Espen@rodekors

Weather

-1 °C 1 m/s from SW ↗ 60% clouds

Avalanche Danger Assessment

2 Moderate Forecast correct

Danger Sign

No signs observed Område: Generelt på fjellet. Beskrivelse: Vindtransportert snø generelt på hele fjellet

ObsID: 186548

Vest-Telemark / VINJE

Snow

15.03.2019 kl. 15:04

1151 masl

håkon@obskorps (***)

Image Of Snow Cover
Image 1 of 4 Of:  Snow Cover Copyright:  håkon@obskorps
Image Of Snow Profile
Image 2 of 4 Of:  Snow Profile Copyright:  håkon@obskorps
Image Of Tests
Image 3 of 4 Of:  Tests Copyright:  håkon@obskorps Comment:  Viser bruddoverflaten gjekk i fokksnøen.
Image Of Snow Profile
Image 4 of 4 Of:  Snow Profile Copyright: 

Snow Cover

No snowdrift 5 cm new snow Some loose snow (1-10cm) Dry

Weather

Snow -4 °C 4 m/s from E ← 100% clouds

Avalanche Danger Assessment

2 Moderate Fokksnøen har startet å stabilisere seg. Men ligger antagelig noe rimkrystaler i enkelte heng. Forventes og holde seg lørdag med øknig søndag Forecast correct

Danger Sign

Recent snowdrift Område: Generelt på fjellet. Beskrivelse:

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. Easy to trigger Likely 2 - Medium Specific steep slopes N, SW, W, NW above 900 masl

Tests

CTM13@20cmQ3 Medium

Avalanche Activity

15. Mar. During the day (+01:00) No avalanche activity Null sikt

Snow Profile

5 stratigraphy layers observed 10 temperature points observed

ObsID: 186420

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.