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Forecast for the Salt Lake Area Mountains

Drew Hardesty
Issued by Drew Hardesty on
Saturday morning, December 11, 2021
Dangerous avalanche conditions exist in the backcountry.
The avalanche danger is CONSIDERABLE on all steep northwest to east facing slopes at the mid and upper elevations. This terrain is to be avoided. Accidents occur on days like today,
You can trigger 1-2' deep avalanches today while on, above, below, or adjacent to steep terrain.
Riding conditions are good on low angle terrain with no overhead hazard.
Low
Moderate
Considerable
High
Extreme
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Special Announcements
This week is the third annual Avalanche Awareness Week in Utah. A lot is going on with over 20 different events around the state. You can find all the events HERE.
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Weather and Snow
Skies are clear.
Mountain temperatures are in the single digits.
Except for sustained 30mph hourly averages along the highest elevations, winds are generally less than 15mph from the west.
With another trace to 2" overnight, the two day storm totals are impressive:
LCC: 29"/2.12" (snow/snow water equivalent)
BCC: 24"/1.77"
Park City Ridgeline: 20"/1.45"
Ogden mountains: 16"/0.7"
Provo mountains: 16"/2.0"
Snow depths are now 3-5' up high and riding conditions are vastly improved.

The Outlook -
For today, we'll see increasing high clouds with light to moderate southwest winds. Temperatures will rise to the low 20s F by the afternoon.
As this storm fades from memory, our attention turns to the next storm churning in the Pacific. We'll see warming temperatures and increasing southwest winds Sunday and Monday ahead of what looks to be a decent snowfall event Tuesday/Wednesday. Southwest winds ahead of the storm are forecast to average 50-60mph.
Recent Avalanches
It's Avalanche Season and conditions are dangerous in the backcountry.
When you experience significant cracking and collapsing 200 yards from the trailhead (see video below), it's clear that all steep terrain that held old snow from October is off and to be avoided.
Backcountry skiers and riders triggered numerous soft slab avalanches 1-2' deep yesterday. Most were 50-150' wide with one releasing "wall-to-wall" 1000' wide in West Monitor Bowl along the Park City ridgeline.
Aspects and elevations included nearly* all of those that harbored old faceted snow from October: mid and upper elevation northwest to east facing terrain.
Many riders reported triggering avalanches at a distance and/or from the safety of a ridgeline, with some avalanches releasing well off the ridgelines and in more protected terrain (ie: gladed and sheltered not open alpine slopes)
(*mid and upper elevation westerly facing slopes were not reported to have avalanched, but they remain suspect.)
Be sure to regularly check the observations page for field observations as well as avalanche activity.
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Avalanche Problem #1
New Snow
Type
Location
Likelihood
Size
Description
Loud booming collapse and shooting cracks yesterday on the PC ridgeline
All the signs of dangerous avalanche conditions will be less evident today than yesterday, but conditions remain equally dangerous. Our primary issue is the interface of the recent storm snow on the old snow surface. One can easily dig down and see weak, sugary faceted snow at this interface and this combination of one to avoid.
For now, I am avoiding being on or below all steep west to north to east facing terrain at the mid and upper elevations.
Avalanche Problem #2
Wind Drifted Snow
Type
Location
Likelihood
Size
Description
Wind drifts remain prevalent on north to east to south facing slopes, but are generally scattered around the compass. These drifts are likely to be more stubborn than yesterday and may break well above the rider on the slope.
Additional Information
Danger Trend: I expect increasing avalanche danger and a fresh batch of wind slabs from the stronger southwest winds tomorrow through Tuesday.
General Announcements

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.