THIS AVALANCHE ADVISORY EXPIRED ON March 8, 2017 @ 1:18 pm
Avalanche Advisory published on March 7, 2017 @ 1:18 pm
Issued by Eric Morgan - Idaho Panhandle Avalanche Center

Selkirks/Cabinets
St. Regis Basin/Silver Valley

bottom line

MODERATE avalanche danger today for mid and upper elevations for the entire forecast region with isolated areas of considerable in steep exposed terrain near ridgetops on windloaded aspects N, NE, E.  With increase in wind, snow and temperatures watch for heavier snow on lighter snow in the upcoming storms producing 1.5 feet of new storm snow weak layers.

How to read the advisory


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

Selkirks/Cabinets
St. Regis Basin/Silver Valley

How to read the advisory

2. Moderate

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Above Treeline

2. Moderate

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Near Treeline

1. Low

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Below Treeline

MODERATE avalanche danger today for mid and upper elevations for the entire forecast region with isolated areas of considerable in steep exposed terrain near ridgetops on windloaded aspects N, NE, E.  With increase in wind, snow and temperatures watch for heavier snow on lighter snow in the upcoming storms producing 1.5 feet of new storm snow weak layers.

  • Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Avalanche Problem 1: Wind Slab
  • Character ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

Expect wind slab formation on steep exposed lee terrain near ridgetops in the upper elevations with incoming snow storms.

Avalanche Problem 2: Storm Slab
  • Character ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

We may have 1.5 plus feet of snow in the mountains the next few days that will produce new potentially weak storm slabs on the pack.  This will be a rapid change to the upper pack and may take some time to adjust.

CURRENT CONDITIONS Weather observations from the Region
0600 temperature: 19 deg. F.
Max. temperature in the last 24 hours: 31 deg. F.
Average wind direction during the last 24 hours: 30
Average wind speed during the last 24 hours: 20 mph
Maximum wind gust in the last 24 hours: 66 mph
New snowfall in the last 24 hours: 1 inches
Total snow depth: 117 inches
weather

Series of snow storms with 1.5 plus feet on the way in the mountains with winds in the 20' s and gusts 30's.  Temperatures warming a few degrees with daytime highs just above 32 and nighttime temps in the teens.  This could be problematic with a mix of lighter storm snow and heavier snow layers intermixing throughout these storm cycles.

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.