Avalanche forecast for Indre Troms Tuesday 2019-02-05

2
Moderate
Published:

Be careful in steep terrain with wind deposited snow, especially in lee areas with large wind slabs. Persistent weak layers are very hard to trigger, but potential avalanches can become very large. Avoid steep terrain if traveling in large groups.

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
High additional load
Specific steep slopes
Possible

Persistent weak layer (slab avalanches)

Buried weak layer of faceted snow beneath a crust

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.
4 - Very large
High additional load
Isolated steep slopes
Unlikely

What are avalanche problems?

Observations the last 3 days (map placed)

0 mm precipitation.
Moderate gale from southeast., change to fresh breeze from the southeast during the afternoon.
-25 °C to -15 °C at 1100 m a.s.l.
Partly cloudy.

For updated info, please visit yr.no
0 mm precipitation.
Calm/light breeze.
-22 °C to -15 °C at 1100 m a.s.l.
Partly cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Indre Troms / BARDU

Snow

05.02.2019 kl. 11:15

853 masl

Eirik Fjær (Unknown)

Image Of Avalanche Activity
Image 1 of 1 Of:  Avalanche Activity Copyright:  Eirik Fjær

Avalanche Activity

5. Feb. During the day (+01:00) Dry slab avalanche One (1). 2 - Medium. Spontaneous release Isolated steep slopes. NE. Above 0 masl

ObsID: 179226

Indre Troms / Melkarfjellet

Snow

03.02.2019 kl. 12:30

754 masl

Aadne@ObsKorps (****)

Image Of Snow Profile
Image 1 of 1 Of:  Snow Profile Copyright: 

Snow Cover

94 cm in total Some snow drift 0 cm new snow Snow line at 0 masl. Layered snow begins at 300 masl Wind slab (hard slab) Dry

Weather

No precipitation -14 °C 15 m/s from SE ↖ 100% clouds Vinden tar ikke overalt, Sjufjellet er for eksempel ikke utsatt i særlig grad for sydøsten, mens det er snøfokk på andre utsatte rygger og fjellsider

Avalanche Danger Assessment

2 Moderate Fokksnø på løs nedføyket snø kan gis små flakskred liten endring før vinden løyer Forecast correct Det er samsvar mellom observasjon og varsel

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, W, NW above 300 masl

Danger Sign

Recent snowdrift Sterk vind på utsatte steder

Snow Profile

3 cm K RGsr 0 mm/0 mm D Fokksnø av varierende tykkelse hefter dårlig til ubundet snø under Q2 brudd, 25 cm F-/1F PP 0 mm/0 mm D Rimlag Ubundet snø med varierende grad av omdanning, 3 cm I 0 mm/0 mm D, 15 cm P RGxf/RGxf 0 mm/0 mm D, 44 cm I/1F IFil/MFcr 0 mm/5 mm D Ispakke med flere islag og grovkornet smelteovandlet snø innimellom, relativt stabilt -14 °C @ 0 cm Liten endring siden sist jeg tok profil i samme område

ObsID: 179015

Indre Troms / BARDU

Snow

02.02.2019 kl. 12:30

692 masl

stisand@Forsvaret (***)

Image Of Snow Profile
Image 1 of 1 Of:  Snow Profile Copyright: 

Snow Cover

70 cm in total Some snow drift 0 cm new snow Wind slab (hard slab) Generelt lite snø i fjellsidene over tregrensa. Mange bare rygger, ligger også lite snø i lesidene (dypeste målt på 150cm) Detter er lokalt i Liveltskaret.

Weather

No precipitation -18 °C 6 m/s from SW ↗

Avalanche Danger Assessment

God binding i snøen, nesten umulig å påvirke de svake lagene ved bakkenivå slik som forholdene er pr. i dag.

Avalanche Problems

Dry slab avalanche Buried weak layer of faceted snow beneath a crust Within a meter A big and identifiable crystal in the weak layer. Very difficult to trigger 1 - Small E, SE, S between 700 masl and 0 masl Gravd mellom 500 - 800 meter .

Notes

Generelt lite snø i dette området, den snøen som ligger er hardpakket. Man kan gå til fots. Snødybden varierer fra ca.150cm i lesider og til bar mark.

Danger Sign

No signs observed

No signs observed

Tests

CTN Good

Avalanche Activity

2. Feb. During the day (+01:00) No avalanche activity

Snow Profile

10 cm P RG 0 mm/0 mm, 3 cm K MFcr 0 mm/0 mm, 47 cm P RG 0 mm/0 mm, 2 cm K MFcr 0 mm/0 mm, 8 cm 4F FC 0 mm/0 mm Påbegynt oppbygging av kantkorn ved bakkenivå. Fortsatt relativt små krystaller, men de er gjenkjennbare.

ObsID: 178862

Indre Troms / BARDU

Snow

02.02.2019 kl. 11:24

663 masl

stisand@Forsvaret (***)

Snow Cover

Some snow drift 0 cm new snow Wind slab (hard slab) Dry Snødekker varierer fra 20-150cm

Weather

No precipitation -18 °C 6 m/s from S ↑

Danger Sign

No signs observed

Tests

CTN

Avalanche Activity

2. Feb. During the day (+01:00) No avalanche activity

ObsID: 178865

Indre Troms / Altevatn

Snow

02.02.2019 kl. 09:50

499 masl

stisand@Forsvaret (***)

Snow Cover

Heavy snow drift 0 cm new snow Dry Kommer store mengder fokksnø

Weather

No precipitation -16 °C 9 m/s from SE ↖

Notes

Store mengder vindtransportert snø. Dårlig sikt.

Avalanche Activity

2. Feb. During the day (+01:00) No avalanche activity

ObsID: 178869

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.