THIS AVALANCHE ADVISORY EXPIRED ON March 9, 2019 @ 6:35 am
Avalanche Advisory published on March 8, 2019 @ 6:35 am
Issued by Melissa Hendrickson - Idaho Panhandle Avalanche Center

St. Regis Basin/Silver Valley

bottom line

The Wednesday/Thursday storm came in warm and cooled down, bonding well to the old snow and leaving us with a new, clean, fluffy riding and sliding surface.  Winds are back to our prevailing direction, so heads up for wind slabs in the NW-E aspects.  

How to read the advisory

St. Regis Basin/Silver Valley

How to read the advisory

The Wednesday/Thursday storm came in warm and cooled down, bonding well to the old snow and leaving us with a new, clean, fluffy riding and sliding surface.  Winds are back to our prevailing direction, so heads up for wind slabs in the NW-E aspects.  

2. Moderate

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

1. Low

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

1. Low

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Below Treeline
Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
    Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Avalanche Problem 1: Wind Slab
  • Type ?
  • Aspect/Elevation ?
  • Likelihood ?
    Certain
    Very Likely
    Likely
    Possible
    Unlikely
  • Size ?
    Historic
    Very Large
    Large
    Small

Our winds are back to our prevailing direction of SW-W so watch for wind slabs on the NW-E aspects.  At the high elevations, the snow is light enough density that it will be avaliable for transport over the next couple of days. 

recent observations

Yesterday we snowmobiled and toured to the Moon Pass and Peak areas.  It was nice to be out in "normal" March weather: mid 20's, overcast, winds out of the southwest.  The storm that just hit us deposited a nice fluffy 6 or 7 inches at elevation that bonded well to the surface underneath, whether that was wind scour, sun crust, or just the old snow.  In our pit tests yesterday, we really put the persistent weak layers through its paces and I believe it is time to drop it out of the big 3.  It hasn't been reactive in a while and is located over a meter down in most places.  If we have a weather system that comes through that wakes it back up again, I'll be the first to let you know.  

Hope everyone gets out this weekend to enjoy the moderate temperatures and generally good stability

Weather and CURRENT CONDITIONS
Two-Day Mountain Weather Forecast Produced in partnership with the Spokane NWS
For 2000 ft. to 4000 ft.
Friday Friday Night Saturday
Weather: Slight Chance Snow Showers Slight Chance Snow Showers then Patchy freezing fog patchy freezing fog then partly sunny
Temperatures: 29 deg. F. 18 deg. F. 30 deg. F.
Wind Direction: SW SW SW
Wind Speed: 5-8 5 5
Expected snowfall: 0 in. 0 in. 0 in.
For 4000 ft. to 6000 ft.
Friday Friday Night Saturday
Weather: Chance Snow Showers Slight Chance Snow Showers Chance snow showers
Temperatures: 20 deg. F. 9 deg. F. 21 deg. F.
Wind Direction: W SW SW
Wind Speed: 9-14 8-10 10-13
Expected snowfall: <0.5 in. <0.5 in. <0.5 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.