Avalanche Advisory
Advisory: Ogden Area Mountains Issued by Mark Staples for Saturday - January 9, 2016 - 7:16am
bottom line

The avalanche danger is MODERATE on mid to upper elevation slopes (above 8000 feet). The main thing to look for is the slightest evidence of wind drifted snow even though winds have been mostly calm. The presence of weak facets under the new snow means that slopes unaffected by the wind may also produce soft slab avalanches.
current conditions

This morning temperatures are in the teens to low 20s F with calm, westerly winds blowing 5 mph gusting to 10 mph. One site at Powder Mountain showed winds blowing 10-15 mph from the NE overnight but had calmed this morning. Since yesterday light snowfall has added up to an inch at most. Recent snow and calm winds have made great skiing and riding conditions.
recent activity

Recent avalanche activity happened Thursday and Friday involving the new snow. A combination of a poor bond between the new and old snow and slight winds produced both natural and human triggered avalanches. Many were soft slabs about 1-1.5 feet deep. A few notable ones include:

  • An avalanche (possibly skier triggered) was seen yesterday just north of Snowbasin above Hell's Canyon. It appeared to have been about 1 ft deep and 100-200 ft wide but it was difficult to see.
  • Natural avalanches occurred above Little Cottonwood Canyon Thursday night and seem to mostly be on slopes that had a little bit of E in their aspect.
Avalanche Problem 1
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 24 hours
description

Avalanches today will mostly involve the new snow and be about a foot deep. There are several reasons we can trigger avalanches today.

  1. Winds haven’t created widespread stiff wind slabs, but they have transported just enough new snow in some places to get a soft slab avalanche.
  2. On some slopes the old snow surface was faceted and the new snow may fracture on these facets. Good places to find this faceted snow are slopes shaded from the sun or slopes that avalanche around Christmas. These slopes broke at the ground, then had a very shallow snowpack during very cold weather. Thin snow + cold weather = faceted snow. New snow from Thursday has formed a very soft slab on top of these facets. Read a great discussion about this issue here.

The new snow should be less sensitive than it was on Thursday and Friday, but with facets underneath the new snow in many places, triggering a slide today remains definitely possible. Sluffing should also be expected on steep slopes where the new snow hasn’t formed a slab yet.
Avalanche Problem 2
type aspect/elevation characteristics
LIKELIHOOD
LIKELY
UNLIKELY
SIZE
LARGE
SMALL
TREND
INCREASING DANGER
SAME
DECREASING DANGER
over the next 24 hours
description

Our discussion about deep slab avalanches sounds like a broken record, but this problem is worth mentioning because it can create a very large avalanche. In 2007, I was caught in a deep slab avalanche 4-6 feet deep on a high elevation, north facing slope. It happened in April and there hadn’t been any deep slab avalanches in weeks but there was a layer of facets near the ground that persisted and remained weak.

Many slopes avalanched around Christmas and now may produce an avalanche about a foot deep. Ones that didn’t avalanche especially on high elevation slopes facing NW through N through E, remain suspect and are worth avoiding, especially rocky slopes that contain many trigger points near buried rocks.
weather

Today a NW flow will keep some clouds over the area, though conditions should dry and skies should become clearer through the day. Temperatures will rise into the high 20s F. Winds will blow westerly about 10 mph.
general announcements

Remember your information can save lives. If you see anything we should know about, please participate in the creation of our own community avalanche advisory by submitting snow and avalanche conditions. You can also call us at 801-524-5304, email by clicking HERE, or include #utavy in your tweet or Instagram.

To get help in an emergency (to launch a rescue) in the Wasatch, call 911.  Be prepared to give your GPS coordinates or the run name. Dispatchers have a copy of the Wasatch Backcountry Ski map.

Backcountry Emergencies. It outlines your step-by-step method in the event of a winter backcountry incident.

If you trigger an avalanche in the backcountry, but no one is hurt and you do not need assistance, please notify the nearest ski area dispatch to avoid a needless response by rescue teams. Thanks.

Salt Lake and Park City – Alta Central (801-742-2033), Canyons Resort/PCMR Dispatch (435)615-1911

Snowbasin Resort Dispatch (801-620-1017), Powder Mountain Dispatch (801-745-3772 x 123).

Sundance Dispatch (801-223-4150)

EMAIL ADVISORY  If you would like to get the daily advisory by email you will need to subscribe here.​ 

DAWN PATROL Hotline updated daily by 5-530am - 888-999-4019 option 8.

Twitter Updates for your mobile phone - DETAILS

UDOT canyon closures:  LINK TO UDOT, or on Twitter, follow @UDOTavy, @CanyonAlerts or @AltaCentral

Utah Avalanche Center mobile app - Get your advisory on your iPhone along with great navigation and rescue tools.

Powderbird Helicopter Skiing - Blog/itinerary for the day

Lost or Found something in the backcountry? - http://nolofo.com/

Ski Utah mobile snow updates

To those skinning uphill at resorts:  it is your responsibility to know the resort policy on uphill travel.  You can see the uphill travel policy for each resort here. IMPORTANT: Before skinning or hiking at a resort under new snow conditions, check in with Ski Patrol.  Resorts can restrict or cut off access if incompatible with control and grooming operations.

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