THIS AVALANCHE ADVISORY EXPIRED ON December 27, 2017 @ 7:00 am
Avalanche Advisory published on December 26, 2017 @ 7:00 am
Issued by Melissa Hendrickson - Idaho Panhandle Avalanche Center

Kootenai
Selkirks/Cabinets
St. Regis Basin/Silver Valley

bottom line

The cold temperatures over the Holiday Weekend didn't help the snowpack stabilize much; there is still a likelyhood of triggereing a persistent slab avalanche. Carefully assess the snowpack and allow for a large margin of error when choosing terrain.  New snow is expected tonight and tomorrow which will continue to stress the weak layers. Look for clues from the snowpack, shooting cracks, and localized collapsing.  

How to read the advisory

Kootenai
Selkirks/Cabinets
St. Regis Basin/Silver Valley

How to read the advisory

The cold temperatures over the Holiday Weekend didn't help the snowpack stabilize much; there is still a likelyhood of triggereing a persistent slab avalanche. Carefully assess the snowpack and allow for a large margin of error when choosing terrain.  New snow is expected tonight and tomorrow which will continue to stress the weak layers. Look for clues from the snowpack, shooting cracks, and localized collapsing.  

3. Considerable

?

Above Treeline
Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.

2. Moderate

?

Near Treeline
Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.

2. Moderate

?

Below Treeline
Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
    Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.
Avalanche Problem 1: Persistent Slab
  • Type ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

The surface hoar and near surface facets on top of the Thanksgiving crust that were buried with last weeks storm still make up the persistent slab that is lurking below the surface. Dig a pit in low angle terrain in a safe spot out of runnout zones to see how the layers are adjusting to the new loads in the areas you are traveling in. 

Weather and CURRENT CONDITIONS
Weather observations from the Region
0600 temperature: 7 deg. F.
Max. temperature in the last 24 hours: 14 deg. F.
Average wind direction during the last 24 hours: WNW
Average wind speed during the last 24 hours: 2 mph
Maximum wind gust in the last 24 hours: 5 mph
New snowfall in the last 24 hours: 3 inches
Total snow depth: 35 inches
Two-Day Mountain Weather Forecast Produced in partnership with the Spokane NWS
For 2000 ft. to 4000 ft.
Tuesday Tuesday Night Wednesday
Weather: Partly Sunny Snow Likely Snow Likely
Temperatures: 19 deg. F. 16 deg. F. 23 deg. F.
Wind Direction: SW SW W
Wind Speed: 7 8 8
Expected snowfall: 0 in. 1-3 in. 1-3 in.
For 4000 ft. to 6000 ft.
Tuesday Tuesday Night Wednesday
Weather: Partly Sunny Snow Likely Snow Likely
Temperatures: 20 deg. F. 15 deg. F. 22 deg. F.
Wind Direction: SW W SW
Wind Speed: 3-5 3-6 7
Expected snowfall: 0 in. 1-3 in. 1-3 in.
Disclaimer

Avalanche conditions change for better or worse continually. Backcountry travelers should be prepared to assess current conditions for themselves, plan their routes of travel accordingly, and never travel alone. Backcountry travelers can reduce their exposure to avalanche hazards by utilizing timbered trails and ridge routes and by avoiding open and exposed terrain with slope angles of 30 degrees or more. Backcountry travelers should carry the necessary avalanche rescue equipment such as a shovel, avalanche probe or probe ski poles, a rescue beacon and a well-equipped first aid kit.  For a recorded version of the Avalanche Advisory call (208)765-7323.