Lawinenlagebericht

Central Sierra Nevada

Sierra Avalanche Center
Auf der Karte ansehen

Lawinengefahr

Hochgebirge
2 · Mässig
Waldgrenze
2 · Mässig
Unterhalb
1 · Gering
Open full map
Veraltet — dieser Lagebericht ist 7 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

MODERATE avalanche danger continues above treeline and near treeline due to recently wind drifted snow. Wind slab avalanches occurred yesterday. LOW avalanche danger continues in wind protected areas below treeline.

Lawinenprobleme

  • Wind Slabs

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

    Two skier triggered wind slab avalanches were reported yesterday. Ridgetop winds out of the ENE have let up only slightly in the last 24 hours. Drifted snow has formed wind slabs near treeline and above treeline on SE-S-SW-W-NW-N aspects. A mix of soft slab and hard slab conditions has been observed. Avalanche size up to D2 remains possible.

    What to do about it? Use clues to identify where problematic wind slabs may exist and communicate within your group on how best to manage the combination of terrain and the avalanche problem. What clues? Blowing snow, wind scouring along ridges, snow surface patterns indicative of scouring vs deposition, new wind pillows, hollow sounding areas, and shooting cracks are indicators of where the most recent drifting and wind slab formation has occurred.

       Photos: Yesterday's intentionally triggered hard wind slab avalanche.

Avalanche Discussion

* Two skier triggered wind slab avalanches occurred yesterday in above treeline terrain on the W side of Relay Peak (Mount Rose area). One unintentionally triggered soft wind slab avalanche involving partial burial occurred in the N aspect Broncho Chutes and one intentionally triggered hard wind slab avalanche occurred on the adjacent W face of Relay Pk. In both cases, avalanche size was reported at D2 and crowns were less than 1 foot. All party members were reported as okay.

* Ridgetop winds above 8,000' were moderate to strong ENE yesterday while calm conditions were reported at 8,000' and below.

* Widespread surface hoar was reported yesterday in near treeline and below treeline avalanche start zones. Intact upright surface hoar warrants monitoring for possible burial and weak layer formation with the next snowfall.

Abgedeckte Regionen