THIS AVALANCHE ADVISORY EXPIRED ON March 31, 2018 @ 6:49 am
Avalanche Advisory published on March 30, 2018 @ 6:49 am
Issued by Melissa Hendrickson - Idaho Panhandle Avalanche Center

St. Regis Basin/Silver Valley

bottom line

The mountains have been experiencing mild weather this week which has helped the snowpack settle and stabilize nicely.  Watch near the ridgetops and ridgelines as they could be harboring isolated windslaps that could be triggered in steep terrain.  Pay attention to daytime temperatures and solar radiation and choose your slopes to follow those temperatures.   

How to read the advisory

St. Regis Basin/Silver Valley

How to read the advisory

The mountains have been experiencing mild weather this week which has helped the snowpack settle and stabilize nicely.  Watch near the ridgetops and ridgelines as they could be harboring isolated windslaps that could be triggered in steep terrain.  Pay attention to daytime temperatures and solar radiation and choose your slopes to follow those temperatures.   

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
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We recieved around an inch of snow last night at the higher elevations with wind gusts in the upper 20s and more wind expected today. Watch for isolated lingering windslabs and thin new ones at the highest elevations.  

Avalanche Problem 2: Loose Wet
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Daytime temperatures are starting to routinely hit above freezing and the sun is starting to come out more and more.  When this happens, watch for rollerballs and pinwheels.  

recent observations

Yesterday the basins around Sunset and Goose peak had generally stable conditions.  The majority of the windslabs from previously in the week had stabilized and the buried persistent weak layers showed improved stability.  The North aspects have several layers in the top pack of snow, but none are too concerning right now. Of interest, the surface of the snow right now has a slight off brown color due to the high winds earlier this week; there is a layer of dust that blew in from the Palouse on Tuesday. We are finishing March with a very strong snowpack; the north sides have 300+ cm of snow and the south sides have 200+ cm and the pack temperatures are still well below freezing at the 6000' elevations.  We are hitting the point in the spring where normal avalanche safety caution will be the norm from here until summer.  

Weather and CURRENT CONDITIONS
Weather observations from the Region
0600 temperature: 31 deg. F.
Max. temperature in the last 24 hours: 34 deg. F.
Average wind direction during the last 24 hours: W
Average wind speed during the last 24 hours: 6 mph
Maximum wind gust in the last 24 hours: 28 mph
New snowfall in the last 24 hours: 1 inches
Total snow depth: 79 inches
Two-Day Mountain Weather Forecast Produced in partnership with the Spokane NWS
For 2000 ft. to 4000 ft.
Friday Friday Night Saturday
Weather: Scattered Showers Partly Cloudy Partly Sunny
Temperatures: 49 deg. F. 30 deg. F. 46 deg. F.
Wind Direction: SW W NE
Wind Speed: 9-16 (G24) 6-14 5-7
Expected snowfall: 0 in. 0 in. 0 in.
For 4000 ft. to 6000 ft.
Friday Friday Night Saturday
Weather: Snow Showers Likely and Windy Chance Snow Showers Mostly Cloudy
Temperatures: 35 deg. F. 24 deg. F. 33 deg. F.
Wind Direction: W W SE
Wind Speed: 18-28 (G37) 17-22(G28) 5-7
Expected snowfall: 1-2 in. <.5 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.