Avalanche forecast for Vest-Telemark Monday 2019-03-18

2
Moderate
Published:

Locally unstable conditions. Be careful in areas with fresh wind deposited snow. Be aware that there can be pockets with persistent weak layer beneath wind deposited snow.

Wind drifted snow (slab avalanches)

Poor bonding between layers in wind deposited 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
Spontaneous release
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
High additional load
Isolated steep slopes
Possible

What are avalanche problems?

Observations the last 3 days (map placed)

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
0 mm precipitation.
Fresh breeze from north.
-10 °C to -2 °C at 1100 m a.s.l.
Clear skies.

For updated info, please visit yr.no

Observations the last 3 days

Vest-Telemark / TINN

Snow

18.03.2019 kl. 21:36

1827 masl

AsbjørnF (Unknown)

Image Of Notes
Image 1 of 1 Of:  Notes Copyright:  AsbjørnF Comment:  Såg denne observasjonen på Facebook

Notes

Incident

Sjå skjermdump. Snow Did not affect anything

Avalanche Observation

18. Mar 15:00 (+01:00) Dry slab avalanche 2 - Medium Human triggered SW-facing 20 cm high and 36 m wide fracture In gully or concave form Eg har sett dette på Facebook, conditions at Gaustatoppen

ObsID: 186961

Vest-Telemark / Gaustatoppen

Snow

18.03.2019 kl. 12:30

1827 masl

Anders (Unknown)

Avalanche Observation

18. Mar 12:30 (+01:00) Dry slab avalanche 1 - Small Human triggered SW-facing Avalanche release at 1849 masl and ended at 1763 masl 20 cm high and 15 m wide fracture

ObsID: 186952

Vest-Telemark / VINJE

Snow

17.03.2019 kl. 08:57

985 masl

Rolf B. (**)

Avalanche Danger Assessment

Riktige

Weather

-4 °C 10 m/s from E ← 100% clouds

Snow Cover

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

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: 

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.

Weather

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

Tests

ECTN12@20cmQ2

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

Avalanche Activity

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

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.

Danger Sign

No signs observed

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

Avalanche Danger Assessment

2 Moderate Forecast correct

Weather

-1 °C 1 m/s from SW ↗ 60% clouds

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: 

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

Weather

Snow -4 °C 4 m/s from E ← 100% clouds

Tests

CTM13@20cmQ3 Medium

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

Avalanche Activity

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

Snow Cover

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

Danger Sign

Recent snowdrift Område: Generelt på fjellet. Beskrivelse:

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.