Avalanche Advisory published on January 29, 2017 @ 6:45 am
Issued by -
bottom line

The avalanche danger is MODERATE due human triggered avalanches being possible in isolated areas today.  Persistent weak layers, ice crusts or crust /facet combinations can be found buried in some areas. Wind slabs of varying thickness exist near ridge lines and on exposed upper elevation terrain.  Pay attention to changing snow conditions as temperatures climb throughout the day. Use good travel techniques, ski or ride one at time and keep your eyes on your partners in steep terrain today.

How to read the advisory

  • Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Avalanche Problem 1: Normal Caution
  • Character ?
  • Aspect/Elevation ?
  • Likelihood ?
    Very Likely
  • Size ?
    Very Large

With warming temperatures, minimal wind and no new precipitation, avalanche conditions are improving throughout the area.  No new slides have been reported or observed. No reports of cracking, collapsing or otherwise unstable snow have been observed over the last few days...However,  we are still tracking several weak layers that were scattered throughout the advisory areas snowpack before last week's warm and windy storm.  

While the likelihood of triggering an avalanche due to one of these buried weak layers is decreasing, you should still be aware that in protected, middle elevation areas there is still a layer of buried surface hoar. Instabilities also exist at the interface between the recent storm snow and the old snow surface in wind protected, treed areas in the middle elevations where fine grained faceted snow was present.  We have also seen thin areas in the snowpack near ridge tops over the last week that are harboring a shallow crust with very weak faceted snow below. The possibility of triggering a wind slab will remain a concern if you are in steep, wind exposed terrain. In addition, inversion conditions mean daytime warming will play a role in snow conditions today,  expect to see an increase in shallow, loose avalanches on sun affected terrain as temperatures climb.  

Normal caution means safe and smart travel techniques: one at a time on steep slopes, keeping your eyes on your partners, being aware of changes in the snow pack as you travel and using extra caution on steeper terrain.  While Avalanche Conditions are improving, there are still areas that you should be suspicious of.

advisory discussion

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The Friends of the Payette Avalanche Center (FPAC) needs YOU! We are in desperate need of more user support and financial assistance. The avalanche forecast is not a guaranteed service, and is in jeopardy of dwindling down to only a couple of days a week in the near future. Please help if you can by clicking the DONATE tab above. If you value this life saving information, make a donation or help the FPAC in raising funds for the future.

Snowmobiler/Snowbiker Travel Restrictions:  a quick reminder that the Granite Mountain Area Closure is now in effect.  In addition there are other areas on the Payette National Forest that are CLOSED to snowmobile traffic including Jughandle Mt east of Jug Meadows, Lick Creek/Lake Fork Drainage (on the right side of the road as you are traveling up canyon), and the area north of Brundage Mt Ski area to junction "V" and along the east side of Brundage and Sergeants' Mts. with the exception of the Lookout Rd( junction "S").  Please respect these closures and other users recreating in them.  Winter Travel Map(East side). You can download the map to the AVENZA app on your phone, and know your exact location while you are out riding. 

recent observations

Yesterday, temperatures climbed into the 30's, the sun was out in force and the snowpack noticed.  Today, you can expect to find crusts forming on the southerly aspects as well as an increase in shallow, loose avalanches occurring as the combination of daytime warming and direct sun break down the bonds in the loose surface snow.  Expect to see activity follow the sun with steep, rocky slopes on the east side of the compass starting things off.  As the day progresses loose activity will swing around to the south and southwest. Soft snow conditions exist on aspects protected from the sun.

Friday in the 20 Mile drainage, George got these photos of loose activity on an ESE face and of the wind effect near the ridge lines. He did not find any sheltered areas that were harboring instabilities from the buried layers that existed prior to last week's storm.



CURRENT CONDITIONS Today's Weather Observations From the Granite Weather Station at 7700 ft.:
0600 temperature: 30 deg. F.
Max. temperature in the last 24 hours: 36 deg. F.
Average wind direction during the last 24 hours: west-southwest
Average wind speed during the last 24 hours: light mph
Maximum wind gust in the last 24 hours: 13 mph
New snowfall in the last 24 hours: 0 inches
Total snow depth: inches

No new snow in the last 24 hours. Winds have been variable and light. High temp yesterday at Granite Mountain weather station was 36 degrees. Today mostly sunny, with a high near 37. West southwest wind 13 to 16 mph. Next chance of new snow will be Tuesday morning



Above shows Granite Mountain weather station data from yesterday.

Two-Day Mountain Weather Forecast Produced in partnership with the NOAA-NWS
McCall Airport at 5021 feet.
  Sunday Sunday Night Monday
Weather: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 21. Calm wind. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 4. Calm wind. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 24. Light south wind.
Temperatures: high 21 deg. F. low 4 deg. F. high 24 deg. F.
Wind direction: calm calm south
Wind speed: calm calm light
Expected snowfall: 0 in. 0 in. 0 in.
Granite Mountain at 7700 feet.
  Sunday Sunday Night Monday
Weather: Mostly sunny, with a high near 37. West southwest wind 13 to 16 mph. Mostly cloudy, with a low around 24. West northwest wind 14 to 16 mph. Mostly cloudy, with a high near 34. West wind 13 to 15 mph.
Temperatures: high 37 deg. F. low 24 deg. F. high 34 deg. F.
Wind direction: west-southwest west-northwest west
Wind speed: 13-16 14-16 13-15
Expected snowfall: 0 in. 0 in. 0 in.

This avalanche advisory is provided through a partnership between the Payette National Forest and the Payette Avalanche Center. This advisory covers the West Central Mountains between Hard Butte on the north and Council Mountain on the south. This advisory applies only to backcountry areas outside established ski area boundaries. This advisory describes general avalanche conditions and local variations always occur. This advisory expires at midnight on the posted day unless otherwise noted. The information in this advisory is provided by the USDA Forest Service who is solely responsible for its content.