Lawinenlagebericht

Tetons

Bridger-Teton Avalanche Center
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Lawinengefahr

Sun
Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
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Veraltet — dieser Lagebericht ist 4 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

The combination of recent snow, wind, and buried weak layers make human triggered avalanches possible today. Cracking within wind drifted snow and audible collapsing of the snowpack are signs of instability. Carefully assess the snowpack before entering steep, rocky terrain with thin coverage.  

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2

    The November 27 layer is now buried 1-3 feet below the surface of the snow at the middle and upper elevations. This layer is present on all aspects at these elevations with varying degrees of weakness. Southern aspects above 7500', and Northern and Eastern aspects at the middle elevations seem to be the worst, but as stated earlier the problem is widespread. Shallow areas of the snowpack in and around rocky zones are also suspect, especially where recent low density snow and light/moderate winds have conspired to increase loading. In these wind loaded areas slab depths could be in excess of 3 feet at the upper elevations.  

    Yesterday a skier triggered and was caught in an avalanche south of Rendezvous Peak near Phillips Canyon. Details are limited at this time, but it appears to have been a size 2 avalanche on a southerly aspect near 10,500 feet (see observations). Similar events are possible today. 

    (12/11/2022) Wind slab on Mt. Oliver (possible persistent).

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1

    Thin wind slabs at the upper elevations are possible. Light, continuous snowfall over the last several days and WNW winds during yesterday afternoon and last night could combine to form slabs on top of crusts on southern aspects. Slab depths of 6-12" are possible in leeward terrain, but cold temperatures should help with reactivity. Raymer has picked up 7 inches of low density snow over the last 5 days and Rendezvous Summit has recieved 424 total miles of wind out of the WNW in the last 24 hrs. 

     

    (12/14/2022)

    Isolated areas of wind slab could be found in upper elevations following the low density snowfall in the 13/14th.

    Photo: Frank Carus

Avalanche Discussion

Yesterday a skier triggered and was caught in an avalanche south of Rendezvous Peak near Phillips Canyon. Details are limited at this time, but it appears to have been a size 2 avalanche on a southerly aspect near 10,500 feet (see observations). Similar events are possible today. 

Yesterday and last night the Tetons picked up a trace to 3 inches of snow (6-7% pow), again. Up to 4 inches of settlement has occured in the last 24hrs. 

The threat of persistent slabs continues today. Wind affected areas have the slab characteristics necessary to propagate fractures within buried weak layers. 

Snow depths generally range from 3-6 feet above 9k’ in the Tetons. The Beaver Creek snow stake (6600’) is currently reading 30 inches. Height of snow (HS) values for Surprise Meadows and Rendevous Bowl are 56 inches and 51 inches respectively, with total snow values of 140 inches and 189 inches respectively. On the west side of the Tetons the Chief Joseph site sits at a depth of the 56 inches with a year to date total of 150 inches. As far as snow water equivalent goes the Tetons are currently sitting at above average values. Targhee Snotel (9260’) is at 106% of median, while Phillips Bench (8200’) and Grassy Lake (7265’) are at 120% and 112% respectively.

  

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