Avalanche forecast for Vest-Finnmark Tuesday 2019-03-26

3
Considerable
Published:

Avoid areas with wind-deposited snow. It is also possible to trigger avalanches in a persistant weak layer in old snow, typically found in bowls and gullies where the snow cover is thin.

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.
3 - Large
Low additional load
Specific steep slopes
Possible

Persistent weak layer (slab avalanches)

Buried weak layer of faceted snow above a crust

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.
3 - Large
High additional load
Specific steep slopes
Possible

What are avalanche problems?

Observations the last 3 days (map placed)

5 mm precipitation.
Breeze from northwest.
-12 °C to -7 °C at 1100 m a.s.l.
Partly cloudy.

For updated info, please visit yr.no
7 mm precipitation, up to 15 mm in the most exposed areas.
Fresh breeze from northwest.
-12 °C to -7 °C at 1100 m a.s.l.
Partly cloudy.

For updated info, please visit yr.no

Observations the last 3 days

Vest-Finnmark / D2007(55440) Hammerfest 2014-2019

Snow

25.03.2019 kl. 13:52

masl

drift@svv (**)

Avalanche Danger Assessment

2 Moderate Moderat skredfare (vurdert fra veg). Rolige værforhold, lettskyet. -1C. Uforandret skredfare neste døgn: Ventes skiftende bris, enkelte snøbyger. .

ObsID: 188111

Vest-Finnmark / ALTA

Snow

25.03.2019 kl. 10:00

258 masl

elianne (****)

Image Of Snow Cover
Image 1 of 1 Of:  Snow Cover Copyright:  elianne Comment:  Fire synlige lag Innen en meter. Overste 40 cm et homogen og baerende. Relativt fuktig snodokke 50-80 cm.

Danger Sign

No signs observed

Weather

NV og byger hele søndag, i dag mandag sol og svak vind.

Avalanche Danger Assessment

2 Moderate

Snow Cover

120 cm in total 5 cm new snow Snow line at 0 masl CT26@70 Q2-Q1. Brudd i velutviklet kantkort (3 mm) 70 cm ned i dekket. ECTX.

ObsID: 188050

Vest-Finnmark / D2007(55440) Hammerfest 2014-2019

Snow

24.03.2019 kl. 14:07

masl

drift@svv (**)

Avalanche Danger Assessment

2 Moderate Moderat skredfare (vurdert fra veg). Rolige værforhold, enkelte snøbyger, 1C. Uforandret skredfare neste døgn: Stort sett samme værforhold neste døgn.

ObsID: 187927

Vest-Finnmark / ALTA

Snow

24.03.2019 kl. 12:53

340 masl

Bjørnulf@ObsKorps (****)

Image Of Snow Cover
Image 1 of 2 Of:  Snow Cover Copyright:  Bjørnulf@ObsKorps
Image Of Snow Profile
Image 2 of 2 Of:  Snow Profile Copyright: 

Avalanche Activity

24. Mar. During the day No avalanche activity

Danger Sign

No signs observed

Weather

No precipitation -2 °C 3 m/s from W → Utpå dagen friskna vinden til og det kom snøbyger. +1 grad nede ved veien.

Avalanche Danger Assessment

2 Moderate Vanskelig å løse ut skred på dagens obstur. Faregrad 2. Der hvor mer snø er flyttet vil det være lettere å løse ut skred i fersk fokksnø, men snødekket stabiliseres raskt under så høye temperaturer så forventer ikke høyere enn faregrad 2 (jf. lite skredaktivitet de siste dagene). Varslet faregrad er i høyeste laget, men har ikke informasjon fra nordvest på Øksfjordhalvøya utenom ett skred for noen dager siden. Formuleringen i snødekkehistorikken "observert vedvarende svake lag av kantkorn, særlig i området fra Langfjorden og vestover" kom etter at jeg 11. mars meldte inn et tynt skarelag liitt oppe i fokksnøen der det ble dannet kantkorn. Dette har blitt til formuleringen ovenfor, som er feil. Vedvarende svakt lag av kantkorn over skare er utbredt over hele regionen. Jeg har ventet på at dette skulle bli tatt bort siden vi har meldt inn skred på kantkorn rundt Alta og flere steder øst for Langfjordbotn, men nå må jeg bare si fra :)

Snow Cover

150 cm in total Some snow drift Some loose snow (1-10cm) Moist Lett snøfokk høyt til fjells. Fuktig øverste del av snødekket i SV-SØ vendte hellinger.

Avalanche Problems

Dry slab avalanche Buried weak layer of faceted snow beneath a crust Within a meter The weak layer collapses easily and clean (easy propagation). The collapsing weak layer is thin < 3 cm. A big and identifiable crystal in the weak layer. Difficult to trigger Possible 3 - Large Specific steep slopes N, NE, E, SE, S, SW, W, NW above 100 masl

Dry slab avalanche Buried weak layer of new snow Within half a meter The collapsing weak layer is thin < 3 cm. The overlying slab is soft. Difficult to trigger Possible 2 - Medium Specific steep slopes E, SE, S above 100 masl

Snow Profile

11 stratigraphy layers observed 1 Stability tests connected to snow profile SØ vendt leheng 340 moh

ObsID: 187919

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.