Lawinenlagebericht

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Veröffentlicht am Jan 6, 2021gültig bis Jan 7, 2021Utah Avalanche Center

Lawinengefahr

Hochgebirge
Waldgrenze
Unterhalb der Waldgrenze

Veraltet — dieser Lagebericht ist 6 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

A CONSIDERABLE AVALANCHE DANGER exists on many steep slopes in the backcountry. Human triggered avalanches 1-2' deep and 200' wide are likely and most prevalent on steep west to north to east facing slopes at the mid and upper elevations. Avalanches may be triggered on, adjacent to, or below steep slopes. A MODERATE danger exists for triggering a lingering wind drift at the mid and upper elevations.

Two points to remember today:

IF you are leaving the ski area at an exit gate, you are most likely stepping into a CONSIDERABLE avalanche hazard.
IF you are skiing or riding alone, your margins of safety are razor thin. If you make a mistake, there is no one to bail you out.

The Good News: excellent riding conditions exist on low angle slopes.

Lawinenprobleme

Persistent Slabs
N
NE
E
SE
S
SW
W
NW
Hochgebirge
Waldgrenze
Unterhalb der Waldgrenze
Wahrscheinlichkeit
Likely
Größe
2
Many steep slopes are hanging in the balance, waiting for a trigger. Recent avalanches as well as collapsing and cracking are bullseye clues that conditions are hazardous to your health if entering steep terrain today.

There's little mystery here: recent storm snow and moderate to strong winds have built a slab that teeters unsteadily over very weak sugar snow and we have a classic upside down strong over weak, unstable snow structure.

This unstable snow structure exists on many west to north to southeast facing slopes at the mid and upper elevations.

As I see it, you have three options;

Avoid the terrain (aspects and elevations) that harbors this unstable snow structure.

Choose this terrain but stick to the low angle slopes with no overhead hazard.

Roll the dice and hope for the best. But as I said earlier, conditions are ripe for an avalanche accident today.
Wind Slabs
N
NE
E
SE
S
SW
W
NW
Hochgebirge
Waldgrenze
Unterhalb der Waldgrenze
Wahrscheinlichkeit
Possible
Größe
2
Ski area control teams triggered a few wind slab avalanches yesterday in upper elevation east facing terrain. You can still trigger these wind drifts today. KNOW that if you trigger a wind drift in west to north to east facing terrain that this initial avalanche may step down into deeper layers in the snowpack, resulting in a much more dangerous avalanche.

Snow and Weather

Skies are clear. It'll be glorious in the mountains today, but conditions are ripe for an avalanche accident.

Storm totals through yesterday morning are 5-8" in the mountains.

West to northwest winds blew moderate to strong through Tuesday morning (video McQueen) before losing steam. They're now generally less than 15mph from the west northwest.

Temperatures have inverted with a ridge of high pressure building overhead. Ridgetop temps are in the upper teens to low 20s; basins are in the low teens.

Alas, mountain temperatures will exceed 0°C/32°F in the upper elevation bands today and snow surface conditions on the sunny aspects will take a hit. Some wet sluffs may be expected by midday.

The Outlook: A weak system noses in Thursday that will cool things a touch and bring some cloud cover. Friday night's storm may offer 2-4", perhaps more.

Special Announcement

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New Post! - A Look Behind the Curtain - A Conversation between an Old and a New Forecaster

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Recent Activity

We didn't hear of any avalanches in the backcountry yesterday, but ski area control work produced some avalanches stepping into old faceted snow on northwest to east facing slopes at 8400' and above. Large booming collapses were also noted.

General Announcements

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This information does not apply to developed ski areas or highways where avalanche control is normally done. This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. This forecast describes general avalanche conditions and local variations always occur.

Observations and Avalanches

Backcountry Emergency Procedures