Bollettino valanghe

Jasper

Mar 3 – 4, 2018Parks Canada
Vedi sulla mappa
Archiviato · scaduto 9 years ago

Pericolo valanghe

Sun
Mon
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

A weak and variable snowpack from recent strong winds and cold temps warrants a cautious approach. Identify features of concern.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–2
    Previous wind effect will be difficult to assess under new snow. Expect hardslabs in the alpine and at treeline. The cold has reduced the tension in these but caution is still warranted.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1.5–3.5
    A slab up to 80cm thick overlies: weak faceted crystals (well developed in shallow areas), surface hoar (at, and just above treeline), and sun crusts ( on steep S and W aspects). Faceting has reduced slab strength below treeline and in shallow areas.

Weather Forecast

Sunday will be cloudy with sun and flurries, trace snow, -20 to -13 and NE light winds. Monday will be a mix of sun and cloud, no snow, -19 to -14, and light Westerly wind. Tuesday will be sun and cloud, -16 to -11, and light SW winds.  Wednesday will be cloudy and flurries, a trace of snow, -15 to -8, with light SW winds.

Snowpack Summary

Wind slabs and extensive wind effect is found in open areas. Recent warm temps and solar effect will have created a crust on solar aspects below treeline. The upper snowpack is a 50 to 80 cm thick slab that sits on three weak layers in the mid-pack. The entire snowpack is faceted after two weeks of cold, dry weather.

Avalanche Summary

Friday's road patrol to Sunwapta noted one giant cornice failure, the size of a bus, with no initiation below. No other naturals were noted in this immediate area. On Wednesday, isolated large Na avalanches were observed. One windslab from a cross loaded pocket on a W aspect and one persistent slab on an E aspect. 

Confidence

Regioni coperte