Bollettino valanghe

San Francisco Peaks / Kachina Peaks Wilderness

Kachina Peaks Avalanche Center
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Pericolo valanghe

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

Five nights of warm overnight temperatures have maintained the heightened risk of avalanches.  Small avalanches will be easy to trigger, and larger avalanches remain possible. The greatest avalanche hazard is concentrated on sunlit steep slopes, especially near cliffs and rocky terrain. When slopes accumulate around 6 inches of loose, cohesionless snow, it's prudent to seek out cooler areas or consider concluding activities for the day.

Today is our last regular avalanche forecast; thank you for the great season and continued support!

Problemi valanghivi

  • Loose Wet

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

    Wet loose avalanches have been minimal over the last week. Continue to anticipate, increased avalanche activity as daytime highs and overnight lows continue to climb. With sustained mild overnight freezes at and above treeline the last 5 days coupled with the late April sun angles, expect wet loose activity earlier in the day than normal. Generally, these wet loose avalanches start on the surface of the snowpack as small point releases but will entrain more snow as they descend down the slope.  Be careful when traveling on soft and slushy snow on and near steep slopes above terrain features, such as cliffs and rocks, as these features increase the hazard and likelihood of wet loose avalanches.

    A small wet loose point release was noted on the east aspect of Rustler Peak in the Humphreys Cirque on Thursday. It was not clear when this avalanche occurred or if it was natural or human-triggered.

    (4/18/2024)

    Current conditions in the Humphreys Cirque. Note the avalanche debris on the south east aspect from previous wet loose cycle. In addition, there was a small point release on an east aspect of Rustler peak that may have occured this week.

    Photo: Tanner Porter

  • Wet Slabs

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

    Warm temperatures and the influx of meltwater into the snowpack increase the risk of more significant and destructive avalanches as the snowpack melts. Wet slab avalanches manifest when moisture saturates a layer within the snowpack, leading to the failure of the cohesive slab above it. Within the snowpack, various melt-freeze crusts and facet combinations, positioned 20-60cm below the surface, serve as potential facilitators, creating an optimal weak layer or bed surface for forming these avalanches. Avoid terrain where and when you suspect wet slab avalanche activity. Remember to give yourself a wide safety buffer to handle the uncertainty surrounding wet slab avalanches.

    These avalanches are harder to predict, and signs of this problem are often subtle; however, they can be large and destructive.

    (4/18/2024)

    A dense 25cm slab on the east-facing aspect failed just above a melt-freeze crust. ECTN18 with a vertical fracture ~1/2 way across the 90 cm block.

    Photo: Tanner Porter

Avalanche Discussion

Late-season storms have given the Kachina Peaks an above-average spring season, with the Snowslide SNOTEL currently recording 188% of the median snowpack. However, over the last few weeks, the snowpack has transitioned to spring, with corn and slush skiing available across aspects and elevations. However, it is important to remember that avalanche danger is still a concern near and above treeline, with wet loose and wet slab avalanches increasing in likelihood as temperatures warm throughout the day. In addition, backcountry travelers should be especially careful in areas where the snowpack did not or had a minimal freeze the previous night.

On Thursday afternoon, snow conditions were generally soft, with shallower and radiant slopes having more than six inches of water-saturated snow on the surface. Snowpits generally yielded warm isothermic temperature gradients with poor to moderate structure but limited propagation propensity (ECTN18). The exception to the warm isothermal gradients was in areas with deeper snowpacks that maintained colder temperatures. Finally, on an east aspect near the Humphreys Trail saddle, small sun cups were beginning to form, highlighting that the season is beginning to wrap up in areas highly impacted by radiant heating.

If you are headed out early and the snowpack froze, ski and splitboard crampons are recommended. An ice axe or a whippet ski pole can be useful. Slopes are hard and icy until they begin to melt, and any slip could result in an out-of-control slip-n-slide. Although most of the mountain has entered a melt-freeze cycle, continue to practice appropriate backcountry travel. Ski one at a time, avoid stopping in run-out zones, and keep an eye on one another. Don't let end-of-season springtime conditions lull you into a state of complacency.

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