Bollettino valanghe

Snake River Range

Bridger-Teton Avalanche Center
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Pericolo valanghe

Tue
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato
Open full map
Non aggiornato — questo bollettino è scaduto 2 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Dangerous avalanche conditions exist. New snow and wind have formed slabs 1-3 feet deep that will be easily triggered by riders in steep, wind loaded terrain. Expect the likelihood of triggering an avalanche to increase throughout the day as additional snowfall accumulates. Natural avalanches will be possible with the rapid loading that is expected to take place today. Carefully monitoring the changing conditions and sticking to low angle terrain will be critical in order to avoid involvement in an avalanche.

The NWS has issued a Winter Storm Warning that will remain in effect until 5 am Tuesday.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2

    The Snakes have received 10-18” of new snow in the past 48 hours. Moderate winds out of the southwest and west have redistributed this snow and formed slabs 1-2 feet deep in steep, wind loaded terrain that will be sensitive to the weight of a person this morning. Up to a foot of new snow and windy conditions are expected today and will increase the size and sensitivity of these slabs. Triggering avalanches big enough to bury a person will be likely in wind loaded terrain steeper than about 30° by day's end. While avalanches are most likely on wind loaded slopes, don’t rule out very steep sheltered terrain if snow totals today hit the upper end of the forecasted amounts (~10”).

    Be on the lookout for signs of wind loading including blowing snow and fresh drifts of denser snow. Cracking, collapsing, and recent avalanches are signs that the new snow is unstable. Consider moving to low angle terrain if you observe these signs. Given the potential for natural avalanches, it is important to avoid traveling under very steep, wind loaded slopes.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–2.5

    A thin layer of weak snow that was buried prior to the most recent storm, labeled the Feb 6th layer, was producing wide propagating avalanches in steep terrain 4-5 days ago. Two days ago, there were reports of avalanches failing at this interface 2-4 feet deep in the adjacent Teton range.  Avalanches at this interface will be more likely today as the new snow overloads the upper portion of the snowpack. This problem will be more pronounced on the north half of the compass in the middle and upper elevations. Avalanches at these depths, in the 3-5 foot range, will be difficult to escape. With this in mind, give yourself an extra wide margin around all avalanche terrain today

    (2/15/2025)

    A skier triggered avalanche in the southern Tetons on a NE slope at 9400 feet on Feb 15th. This avalanche had varying crown depths up to 2.5 feet, putting it in the "persistent slab" category.

    SS-AS-R3-D2-O

    Red circle was the trigger point on ski cut. Red line is first release, blue line is second release.

Avalanche Discussion

Three day storm totals in the Snake are sitting around 24” with 1.5” of water weight. Snow density and winds have increased over the past 24 hours. This means that the new snow today will not behave like the low density “blower” snow that was observed yesterday in many locations. Expect to find more reactive and ultimately more dangerous avalanche conditions today than yesterday despite the same danger rating.

Potential weak interfaces can be found within the new snow (10-30” down), on the Feb 6th interface (3-5 feet down) and on the Feb 4th crust below 9,000 feet (2-4 feet down). All of these depths are great enough to create avalanches that can injure or bury a person. The deeper the avalanche, the greater potential for significant harm. Today is a good day to dial back terrain choices and give the snowpack time to adjust to this rapid change.

Regioni coperte