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Forecast for the Salt Lake Area Mountains

Greg Gagne
Issued by Greg Gagne on
Friday morning, December 25, 2020
There is a CONSIDERABLE avalanche danger at mid and upper elevations on aspects facing west, north and east for triggering large avalanches that are 1-2' deep and up to several hundred feet wide. Avalanches may be triggered remotely and from lower-angled terrain. Avoid being on, underneath or adjacent to slopes greater than 30°in steepness on these mid and upper elevation aspects.
On mid and upper elevation southerly aspects there is a MODERATE danger.
Low elevations have a Low danger.
Low
Moderate
Considerable
High
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Weather and Snow
Allure of fresh snow.
Persistent weakness. One should
read Mary Ruefle.

This Morning: Some high thin clouds and a temperature inversion with lower-elevation trailheads in the teens and low 20's F and in the upper 20's F along upper elevation ridges and peaks. Winds are out of the south/southwest and very light - less than 10 mph - with gusts in the teens at 11,000'.
For Today: High thin clouds with clearing this afternoon. Temperatures will remain mild, rising slightly above freezing in most mountain locations, with lower-elevations reaching the mid 30's F. Winds will be out of the southwest and remain light, with an uptick this afternoon with gusts in the teens and low 20's mph at the mid and upper elevations.
This Weekend: Increasing clouds tonight with a weak system for Saturday which may bring a few inches of light snow. Looking further ahead, chances for light snow early this coming week and then perhaps right around the New Year.
Recent Avalanches
Week in Review: It has been active this past week, with snowfall, wind and over 30 natural and human-triggered avalanches reported. Catch up by reading our Week in Review - where we highlight significant snow and weather events from the past week.

Reports of remotely and sympathetically-triggered avalanches continue to roll in:
Wednesday 12/23 - Squaretop on Park City Ridgeline. I also visited the remotely-triggered slide in Dry Fork. This one spooked me as it was a 2' hard slab that ran through dense trees and over a cliff band.
Thursday 12/24 - West Monitor on Park City Ridgeline. Control work from Park City resorts triggered slides up to 500' wide and 1-2' deep. In Days Fork a remotely-triggered avalanche at the top of Banana Days which then sympathetically pulled out two avalanches in adjacent Main Days. [Photos B. Nalli]
This heat map shows the distribution of avalanches in the Salt Lake mountains since Thursday, December 17. They have been on aspects facing northwest through east - focused on northeast and east - above 9000'.
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Avalanche Problem #1
Persistent Weak Layer
Type
Location
Likelihood
Size
Description
A persistent weak layer (PWL) of faceted snow and depth hoar exists in the bottom foot of the snowpack on mid and upper-elevation slopes except those facing south. Snowfall and wind-drifted snow this past week have overloaded these weak layers, with several remotely-triggered avalanches. Wednesday's remotely-triggered slide in Dry Fork got my attention as it was triggered from a tracks on an adjacent, low-angled slope and pulled out a 2' deep hard slab that ran through trees. Thursday's remote slide in Banana Days and then sympathetically-released slide in adjacent Main Days illustrates how strong and connected the slab on top of the PWL has become.
These recent avalanches - as well as continued loud, booming collapses and cracking - is the snowpack talking to us, and the message isn't Happy Holidays.
Avoid slopes steeper than 30° on mid and upper elevation aspects facing west, through north, and east. Triggering an avalanche on these slopes is likely; they may be up to 2' deep and several hundred feet wide.
The good news is that low-angled slopes in non-avalanche terrain are riding quite well!
General Announcements
Please visit this website with information about Responsible Winter Recreation by the Utah Office of Outdoor Recreation.

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.