THIS AVALANCHE ADVISORY EXPIRED ON February 28, 2018 @ 7:00 am
Avalanche Advisory published on February 27, 2018 @ 7:00 am
Issued by Melissa Hendrickson - Idaho Panhandle Avalanche Center

St. Regis Basin/Silver Valley

bottom line

The region recieved a substantial amount of new snow and high winds over the weekend, over 20 inches in most places. We saw extensive windslab development in the higher elevations. Yesterday was a brief respite from those winds, but overnight they picked up to transport speed again and will be accompanied by another shot of precipitation today.  Expect sensitive windslabs on leeward aspects and allow time for the storm slabs to stabilize.  

How to read the advisory

St. Regis Basin/Silver Valley

How to read the advisory

The region recieved a substantial amount of new snow and high winds over the weekend, over 20 inches in most places. We saw extensive windslab development in the higher elevations. Yesterday was a brief respite from those winds, but overnight they picked up to transport speed again and will be accompanied by another shot of precipitation today.  Expect sensitive windslabs on leeward aspects and allow time for the storm slabs to stabilize.  

3. Considerable

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

3. Considerable

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

2. Moderate

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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: Wind Slab
  • Type ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

Generally WSW - S winds have been been creating sensitive windslabs on leeward aspects. Shooting cracks, whoomphing, and blowing snow are all red flags of instability. 

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

The storm snow layer will need a few days to settle, strengthen, and bond. 

Weather and CURRENT CONDITIONS
Weather observations from the Region
0600 temperature: 13 deg. F.
Max. temperature in the last 24 hours: 19 deg. F.
Average wind direction during the last 24 hours: WSW
Average wind speed during the last 24 hours: 7 mph
Maximum wind gust in the last 24 hours: 26 mph
New snowfall in the last 24 hours: 7-9 inches
Total snow depth: 88 inches
Two-Day Mountain Weather Forecast Produced in partnership with the Spokane NWS
For 2000 ft. to 4000 ft.
Tuesday Tuesday Night Wednesday
Weather: Chance Snow then snow Snow Chance snow
Temperatures: 29 deg. F. 25 deg. F. 34 deg. F.
Wind Direction: SW SW S
Wind Speed: 8-10 7-9 7-9
Expected snowfall: <1 in. 1 in. <1 in.
For 4000 ft. to 6000 ft.
Tuesday Tuesday Night Wednesday
Weather: Snow Likely Snow Snow Likely
Temperatures: 22 deg. F. 19 deg. F. 26 deg. F.
Wind Direction: SW SW S
Wind Speed: 14-17 (G26) 14-16 (G24) 10
Expected snowfall: 1-3 in. 2-4 in. 1-2 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.