THIS AVALANCHE ADVISORY EXPIRED ON December 9, 2017 @ 6:16 am
Avalanche Advisory published on December 8, 2017 @ 6:16 am
Issued by Jeff Thompson - Idaho Panhandle Avalanche Center

Kootenai
Selkirks/Cabinets

bottom line

It's been at least 2 weeks since the Cabinet or Selkirk mountians have seen any new snowfall. The recent high presusure and colder temperatures have started to break down the snowpack (near surface faceting). In most areas the snowpack can be summed up in 2 parts. The bottom half of the pack is old firm frozen snow and the upper portions of the pack is light unconsolidated snow. In it's current state the snowpack doesn't present much avalanche danger. 

How to read the advisory

Kootenai
Selkirks/Cabinets

How to read the advisory

It's been at least 2 weeks since the Cabinet or Selkirk mountians have seen any new snowfall. The recent high presusure and colder temperatures have started to break down the snowpack (near surface faceting). In most areas the snowpack can be summed up in 2 parts. The bottom half of the pack is old firm frozen snow and the upper portions of the pack is light unconsolidated snow. In it's current state the snowpack doesn't present much avalanche danger. 

1. Low

?

Above Treeline
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

1. Low

?

Near Treeline
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

1. Low

?

Below Treeline
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
    Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
Avalanche Problem 1: Loose Dry
  • Type ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

The upper portion of the snowpack is unconsolidated faceted snow which is capible of sliding down hill. It's a matter of gravity right now. If a slope is steep enough (35 degrees +) it could slide down hill. Think of a pile of sugar sitting on a table. If you pick up one side of the table higher and higher...eventually the sugar will slide off. 

Weather and CURRENT CONDITIONS
Weather observations from the Region
0600 temperature: 19 deg. F.
Max. temperature in the last 24 hours: 34 deg. F.
Average wind direction during the last 24 hours: NW
Average wind speed during the last 24 hours: 9-15 mph
Maximum wind gust in the last 24 hours: 33 mph
New snowfall in the last 24 hours: 0 inches
Total snow depth: 34 inches
Two-Day Mountain Weather Forecast Produced in partnership with the Spokane NWS
For 2000 ft. to 4000 ft.
Friday Friday Night Saturday
Weather: Cloudy Cloudy / Fog Partly cloudy
Temperatures: 28-33 deg. F. 25-27 deg. F. 29-34 deg. F.
Wind Direction: NE NE NE
Wind Speed: 5-10 5-10 5-10
Expected snowfall: 0 in. 0 in. 0 in.
For 4000 ft. to 6000 ft.
Friday Friday Night Saturday
Weather: Partly sunny Mostly cloudy Partly sunny
Temperatures: 32-38 deg. F. 21-25 deg. F. 31-37 deg. F.
Wind Direction: NW NW NW
Wind Speed: 10-12 8-10 10-13
Expected snowfall: 0 in. 0 in. 0 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.