Avalanche forecast for Nord-Troms Sunday 2019-04-21

3
Considerable
Published:

The snow pack is wet in the lower areas due to high temperatures. Loose snow avalanches may be triggered in exposed slopes. Above the treeline snowfall and wind will cause unstable storm slabs. There is also a persistent weak layer present, and this may cause large avalanches.

Wind drifted snow (slab avalanches)

Poor bonding between layers in wind deposited snow

Avoid steep (more than 30 degrees) areas 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.
3 - Large
Low additional load
Specific steep slopes
Possible

Wet snow (slab avalanches)

Buried weak layer of faceted snow above a crust

Avoid avalanche release and run out areas. Wet snow avalanches tend to release spontaneously. Stability decreases when the snow surface gets wet and soft. Timing is important.
3 - Large
High additional load
Isolated steep slopes
Possible

Wet snow (loose snow avalanches)

Loose snow

Avoid avalanche release and run out areas. Wet snow avalanches tend to release spontaneously. Timing is important. Stability decreases when the snow surface gets wet and soft.
2 - Medium
Spontaneous release
Specific steep slopes
Possible

What are avalanche problems?

Observations the last 3 days (map placed)

1 mm precipitation.
Strong breeze from southwest.
0 °C to 4 °C at 1100 m a.s.l.
Plus degrees up to 1400 m a.s.l. during the afternoon.
Partly cloudy.

For updated info, please visit yr.no
5 mm precipitation.
Moderate gale from southwest.
-3 °C to 1 °C at 1100 m a.s.l.
Plus degrees up to 500 m a.s.l. during renoon.
Partly cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Nord-Troms / D1907(55340) Nord Troms 2017-2022

Snow

21.04.2019 kl. 11:13

masl

drift@svv (**)

Weather

Rain 5 °C Arnøya (0moh) kl 08:00 0 cm nysnø akkumulert siste døgn.

Avalanche Activity

No avalanche activity Gjelder Fv347 Lauksundskaret - Arnøyhamn,

Danger Sign

Quick temperature change

Much water in the snow regn på snø

ObsID: 192119

Nord-Troms / D1907(55340) Nord Troms 2017-2022

Snow

20.04.2019 kl. 09:58

masl

drift@svv (**)

Weather

No precipitation 8 °C Arnøya (0moh) kl 08:00 0 cm nysnø akkumulert siste døgn.

Avalanche Activity

No avalanche activity Gjelder Fv347 Lauksundskaret - Arnøyhamn,

Danger Sign

Quick temperature change

ObsID: 191965

Nord-Troms / SKJERVØY

Snow

19.04.2019 kl. 15:47

559 masl

Hans-Jørgen@ObsKorps (***)

Image Of Snow Cover
Image 1 of 2 Of:  Snow Cover Copyright:  Hans-Jørgen@ObsKorps
Image Of Snow Cover
Image 2 of 2 Of:  Snow Cover Copyright:  Hans-Jørgen@ObsKorps

Snow Cover

Nedbør som snø over 400 moh. Gjennomvått snødekke uten markant lagdeling opp til 400 moh. Flere våte løssnøskred observert, særlig i V sektor.

ObsID: 191892

Nord-Troms / KÅFJORD

Snow

19.04.2019 kl. 14:54

634 masl

jan arild@obskorps (*****)

Image Of Snow Profile
Image 1 of 1 Of:  Snow Profile Copyright:  jan arild@obskorps Comment:  Nv vendt konveks brattheng 700 moh hvor snødekket er tynt. 20 cm 1F-P RG fuktig til tørr/ 4cm kantkorn 4F+ som et i ferd med å bli smelteomvandlet / 20 cm K skare. God stabilitet

Avalanche Danger Assessment

2 Moderate Generelt stabilt. Mildværet som meldt har ikke slått til i Kåfjord. Snødekket er våt smelteomvandlet ned til bunn med delvis bærende fra ca 200 moh. Kantkorn virker å være nøytralisert og ferd med å bli smelteomvandlet og ikke å være et skredproblem. Høyere temperaturer vil medføre fare for naturlig utløse løssnøskred. Forecast too high

Avalanche Activity

19. Apr. During the day No avalanche activity Ingen skredaktivitet verken sett på obsturen eller på kjøring gjennom Kåfjord

Snow Cover

No snowdrift Crust Moist Under tregrensen er snødekket vått ned til bunn men bærende i høyde over 200 moh. Over 600 moh 1 cm våt nysnø over fuktig fokksnø. Snødekket i nordvendte sider i høyden er tørr i høyde over 700 moh.

Tests

ECTX Good

Danger Sign

No signs observed

Avalanche Problems

Loose wet avalanche Loose snow Difficult to trigger 2 - Medium N, NE, E, SE, S, SW, W, NW below 400 masl

ObsID: 191887

Nord-Troms / KÅFJORD

Snow

19.04.2019 kl. 14:09

1086 masl

StigR@obskorps (***)

Image Of Weather
Image 1 of 1 Of:  Weather Copyright:  StigR@obskorps

Weather

No precipitation from SW ↗ 100% clouds Mildt med litt vind fra sørvest. Tåke

Snow Cover

No snowdrift 1 cm new snow Wind slab (hard slab) Dry Tørr vindpakket i nordvendte sider. Stedvis skare og smelteomvandlet i sørvendte sider. Snødekket et stabilt i høyden.

ObsID: 191880

Nord-Troms / KÅFJORD

Snow

19.04.2019 kl. 13:31

838 masl

jan arild@obskorps (*****)

Image Of Weather
Image 1 of 1 Of:  Weather Copyright:  jan arild@obskorps

Weather

Sleet -1 °C from SW ↗ 100% clouds

Avalanche Activity

19. Apr. During the day No avalanche activity

Danger Sign

No signs observed

ObsID: 191874

Nord-Troms / KÅFJORD

Snow

19.04.2019 kl. 11:59

373 masl

StigR@obskorps (***)

Image Of Weather
Image 1 of 1 Of:  Weather Copyright:  StigR@obskorps

Weather

Sleet 100% clouds Enkelte sluddbyger.

Snow Cover

Crust Wet Snødekket fra 300 MOH er bærende pga nattefrost.

ObsID: 191867

Nord-Troms / D1907(55340) Nord Troms 2017-2022

Snow

19.04.2019 kl. 11:16

masl

drift@svv (**)

Weather

No precipitation 5 °C Arnøya (0moh) kl 08:00 0 cm nysnø akkumulert siste døgn.

Avalanche Activity

No avalanche activity Gjelder Fv347 Lauksundskaret - Arnøyhamn,

Danger Sign

No signs observed

ObsID: 191857

Nord-Troms / SKJERVØY

Snow

18.04.2019 kl. 20:06

457 masl

Benjamin GERARD GROSSO (Unknown)

Image Of Avalanche Observation
Image 1 of 1 Of:  Avalanche Observation Copyright:  Benjamin GERARD GROSSO

Avalanche Observation

18. Apr 16:00 Wet loose-snow avalanche 4 - Very large Human triggered Avalanche release at 436 masl and ended at 24 masl Steep slope

ObsID: 191779

Nord-Troms / D1907(55340) Nord Troms 2017-2022

Snow

18.04.2019 kl. 10:49

masl

drift@svv (**)

Weather

No precipitation 5 °C Arnøya (0moh) kl 08:00 0 cm nysnø akkumulert siste døgn.

Avalanche Activity

No avalanche activity Gjelder Fv347 Lauksundskaret - Arnøyhamn,

Danger Sign

No signs observed

ObsID: 191673

Nord-Troms / KÅFJORD

Snow

18.04.2019 kl. 10:24

457 masl

jan arild@obskorps (*****)

Image Of Snow Profile
Image 1 of 2 Of:  Snow Profile Copyright:  jan arild@obskorps Comment:  Kantkorn over skare 30 cm ned i snødekket, våt. Tørr fokksnø over
Image Of Snow Profile
Image 2 of 2 Of:  Snow Profile Copyright:  jan arild@obskorps Comment:  Kollaps bed tre klapp lille blokktest
ObsID: 191670

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.