THIS AVALANCHE ADVISORY EXPIRED ON March 28, 2018 @ 6:30 am
Avalanche Advisory published on March 27, 2018 @ 6:30 am
Issued by Jeff Thompson - Idaho Panhandle Avalanche Center

Selkirks/Cabinets

bottom line

Just as we get going with Spring, winter comes roaring back! A strong, fast moving system's currently moving through the panhandle. the storm looks like it will drop another 4-6'' of snow (above 4000') accompanied by strong SW winds. It looks like the storm will push out tomorrow morning. The cold temperatures leading up to this storm have kept the snowpack cold and frozen.  Be most aware of new snow slab formation. Hang in there, spring has to come sometime...right?!

How to read the advisory

Selkirks/Cabinets

How to read the advisory

Just as we get going with Spring, winter comes roaring back! A strong, fast moving system's currently moving through the panhandle. the storm looks like it will drop another 4-6'' of snow (above 4000') accompanied by strong SW winds. It looks like the storm will push out tomorrow morning. The cold temperatures leading up to this storm have kept the snowpack cold and frozen.  Be most aware of new snow slab formation. Hang in there, spring has to come sometime...right?!

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: Storm Slab
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Strong winds are going to transport a significant load of snow for the next 12-18 hours. 1-2' of new load should be expected below ridge lines on leeward faces (SE-E-NE-N-NW).  The new wind slabs will be sitting on old wind slabs which provide a good sliding surface.  In less wind effected areas the new snow is going to fall on soft snow from this past weekends storm. The new snow and older snow will probably bond well, it just might take a couple days. New snow usually takes a couple days to gain strength and adjust to the snowpack it's sitting on.  Be heads up to signs of instability (cracking, whoomphing, observed avalanche activity).

Avalanche Problem 2: Persistent Slab
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The snowpack has seen a lot of weight added to it over the past week. The more weight added to the snowpack ,the more pressure on buried weak layers. So far the persistent weak layers in the snowpack are staying quiet, but be looking out for signs of instability.  Cracking, whoomphing, observed avalanches and pinwheels should all be red lights. Try to test the snow on smaller safe spots before exposing yourself or group to bigger avalanche terrain.

Weather and CURRENT CONDITIONS
Weather observations from the Region
0600 temperature: 23 deg. F.
Max. temperature in the last 24 hours: 24 deg. F.
Average wind direction during the last 24 hours: SW
Average wind speed during the last 24 hours: 18 mph
Maximum wind gust in the last 24 hours: 49 mph
New snowfall in the last 24 hours: 3 inches
Total snow depth: 140 inches
Two-Day Mountain Weather Forecast Produced in partnership with the Spokane NWS
For 2000 ft. to 4000 ft.
Tuesday Tuesday Night Wednesday
Weather: Rain Chance of rain/snow Mostly sunny
Temperatures: 43 deg. F. 35 deg. F. 45 deg. F.
Wind Direction: SW SW SW
Wind Speed: 9-11 5-8 3-7
Expected snowfall: 0 in. >.5'' in. 0 in.
For 4000 ft. to 6000 ft.
Tuesday Tuesday Night Wednesday
Weather: Snow Snow then cloudy Mostly sunny
Temperatures: 36 deg. F. 31 deg. F. 38 deg. F.
Wind Direction: SW SW SW
Wind Speed: 24-26 G39 18 -23 decreasing to 8-10 7-13
Expected snowfall: 2-4'' 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.