Bulletin d’avalanche

Tromsø

NVE
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Danger d’avalanche

All elevations
1 · Faible
Périmé — ce bulletin a expiré 3 months ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

In many places, the snowpack has transformed through melting into coarse-grained snow that drains water well. Cloudy weather helps to reduce avalanche danger somewhat, but warm temperatures can still make small wet loose snow avalanches easy to trigger or cause them to release naturally. Steep slopes are particularly exposed, and it is important to keep a distance from areas where the snow becomes too soft.

In high mountain areas, there are still layered structures in the snowpack, especially on north-facing slopes. Meltwater can penetrate and weaken these layers, which may trigger wet slab avalanches. These avalanches can become larger than typical loose snow avalanches and cannot be ruled out. Glide avalanches may also occur where water collects over smooth surfaces such as exposed rock slabs. In addition, cornices are weakening as temperatures rise, increasing the risk that they may break off and collapse.

Avalanche Activity

In many places, the snowpack has transformed through melting into coarse-grained snow that drains water well. Cloudy weather helps to reduce avalanche danger somewhat, but warm temperatures can still make small wet loose snow avalanches easy to trigger or cause them to release naturally. Steep slopes are particularly exposed, and it is important to keep a distance from areas where the snow becomes too soft. In high mountain areas, there are still layered structures in the snowpack, especially on north-facing slopes. Meltwater can penetrate and weaken these layers, which may trigger wet slab avalanches. These avalanches can become larger than typical loose snow avalanches and cannot be ruled out. Glide avalanches may also occur where water collects over smooth surfaces such as exposed rock slabs. In addition, cornices are weakening as temperatures rise, increasing the risk that they may break off and collapse.

Snødekket er mange steder smelteomvandlet, grovkornet og drenerer vann godt. Overskyet vær bidrar til å dempe skredfaren noe, men varme temperaturer kan fortsatt føre til at små våte løssnøskred er lette å løse ut, eller at de løsner naturlig. Bratte heng er særlig utsatt, og det er viktig å holde avstand til områder der snøen blir for myk.

Høyt til fjells finnes det fortsatt lagdeling i snødekket, spesielt i nordvendte sider. Smeltevann kan trenge ned og svekke disse lagene, noe som kan utløse våte flakskred. Disse skredene kan bli større enn vanlige løssnøskred og kan ikke utelukkes helt. Glideskred kan også forekomme der vann samler seg over glatte underlag som svaberg. Videre svekkes skavler med stigende temperaturer, noe som øker risikoen for at de kan knekke og rase ut.

Snowpack Structure

Snøoverflaten har et tydelig vårlig preg, og det har vært kraftig smelting den siste tiden. Sammenhengende snø finnes fra omtrent 200–400 moh og oppover, avhengig av hvor i regionen du befinner deg, med mest snø i nordvendt terreng og i indre strøk. Snødekket er i hovedsak smelteomvandlet. Likevel kan det fortsatt finnes noe lagdeling igjen i skyggesider og på de høyeste toppene. Flere skare- og islag i snødekket kan gi opphoping av vann ved kraftig oppvarming eller regn, og muliggjør våte flakskred.

Tendency

Generally stable conditions, but rain may trigger some small wet avalanches in very steep terrain.

Bulletin data: Norwegian Water Resources and Energy Directorate (NVE), varsom.no (NLOD)

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