THIS AVALANCHE ADVISORY EXPIRED ON December 13, 2015 @ 5:44 am
Avalanche Advisory published on December 12, 2015 @ 5:44 am
Issued by -
bottom line

The Avalanche Hazard is MODERATE in the West Central Mountains today above 6,000 feet. Below 6,000 the Avalanche Hazard is  LOW.

How to read the advisory


  • 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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In the upper evelvations the snow from the last 48 hours could pose a danger. With 12-20 inches of new snow over the last few days it will be possible to find storm slabs in isolated areas. This new snow is sitting on a well developed crust and could ruin your day if you were to trigger in high consequence terrain.

 

Avalanche Problem 2: Wind Slab
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The new snow combined with winds out of the South-Southeast has formed wind slabs in higher elevation terrain. Similar to the storm slabs, these are going to be isolated but could ruin your day if triggered over cliffs or above a terrain trap.

advisory discussion

If you get out in the backcountry we would be STOKED to hear about it. Use the OBSERVATION tab at the top of the page, it is quick and easy. Or you can drop us an email at forecast@payetteavlanche.org 

KM

recent observations

It is not very often that an extensive rain event is welcomed, but in the case of the drenching downpour that the West Central Mountains received last week it was a blessing in disguise. The rainfall penetrated our snowpack and saturated the basal facets all the way into the upper elevations. This soaker was followed by a rapid cooling on Wednesday afternoon into Wednesday night. The cold front allowed the for a stout ice crust to form on the snow pack, which caused for poor skiing/riding conditions on Thursday in most areas other than the uppermost elevations.

CURRENT CONDITIONS Today's Weather Observations From the Granite Weather Station at 7700 ft.:
0600 temperature: 19 deg. F.
Max. temperature in the last 24 hours: 25 deg. F.
Average wind direction during the last 24 hours: SW
Average wind speed during the last 24 hours: 7 mph
Maximum wind gust in the last 24 hours: 15 mph
New snowfall in the last 24 hours: 6 inches
Total snow depth: 48 inches
weather

It is currently snowing lightly in McCall at 5 AM and Brundage Montain picked up 2" overnight. Expect to see a few more inches of new snow fall today before the whopper of precipitation arrives this evening. The National Weather Service has changed the Strom Watch to a Storm Warning for the West Central Mountains. Heavy snowfall is on tap for tonight and especially tomorrow, which should be the quentessential storm day.

Two-Day Mountain Weather Forecast Produced in partnership with the NOAA-NWS
McCall Airport at 5021 feet.
  Saturday Saturday Night Sunday
Weather: Snow showers likely before 11am, then a chance of snow after 11am. Cloudy Snow. Snow.
Temperatures: High 31 deg. F. Low 28 deg. F. High 32 deg. F.
Wind direction: south south-sourheast south-southeast
Wind speed: 5-8 10 8-10
Expected snowfall: 1 in. 3-5 in. 4-8 in.
Granite Mountain at 7700 feet.
  Saturday Saturday Night Sunday
Weather: Snow showers before 11am, then snow likely after 11am. Snow. Snow.
Temperatures: High 24 deg. F. Rising to 27 overnight deg. F. High 28 deg. F.
Wind direction: south south south-southwest
Wind speed: 10-15 increasing to 17-22 mph in the afternoon 23-30 mph with gusts to 40 mph 24-28 mph with gusts to 45mph
Expected snowfall: 1-3 in. 6-10 in. 10-14 in.
Disclaimer

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.