Bollettino valanghe

Tetons

Bridger-Teton Avalanche Center
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Pericolo valanghe

Sun
Alta quota
2 · Moderato
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
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In sintesi

Avalanches that are large enough to bury a person are unlikely today but the avalanche danger will increase slightly throughout the day. Pockets of wind slab exist in exposed terrain, especially in the alpine. For the most part these slabs are shallow and fairly stubborn. Small avalanches in extreme terrain can still have severe consequences. Monitor the effects of oncoming storm and  pay attention to signs of instability such as cracking within wind drifted snow. 

The avalanche danger will start off at LOW today but could increase to MODERATE at the upper elevations if the forecasted wind/snow show up earlier than expected.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1

    Small wind slabs (size 1) that are 6-10 inches thick exist at the upper elevations on a variety of aspects. Ridgeline winds have been variable in both direction and magnitude since Monday's snowfall. These wind slabs could be soft or hard, with the hard slabs being quite stubborn. Wind slab reactivity may increase with solar input. Look for signs of instability such as cracking within wind drifted snow and monitor the effects of the sun on the snow surface. 

    New snow and wind later today and this evening will combine to form fresh wind slabs. These slabs should be very small but will lie on a variety of snow surfaces, including, but not limited to, near surface facets, wind board, wind skin, and sun crusts. 

Avalanche Discussion

The savvy backcountry user will continue to look for signs of instability today especially as the forecasted storm picks up in intensity.

The Tetons have been under dry zonal flow for the last 24 hours and have gone over 72 hours without measureable snowfall. Zonal flow will give way to a shortwave trough today. The last storm system rolled through on Monday the 13th and was followed by strong northerly winds in the post frontal regime.

Recent avalanches have been confined to small (size 1) wind slabs in the alpine on a variety of aspects. These avalanches have generally occured in steep and exposed terrain with dire consequences. 

Current snow surfaces have been worked by the wind in exposed terrain. Near surface facets are present on the northern half of the compass. Southerly aspected have been crusted by the sun and have faceted as well. The January 26 crust/facet combo lies 40-70 cm below the surface of the snow at upper elevations on the southern half of the compass. The last known human triggered avalanches associated with this layer occured in the wake of the major storm event at the end of January and early February. The November 27 layer generally lies 1-2 meters below the surface of the snow at upper elevations on the southern half of the compass. The last known human triggered avalanche associated with this layer was on January 16.  

 

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