SOUTHWEST TRAILS/GREY'S RIVER AREA FORECAST

Issued at 12/16/2018 06:34   Valid until: 12/16/2018 23:59

CURRENT CONDITIONS (Mountain Weather Past 24 Hours)
At 10,400' Elevation 5 AM Temp Max Temp Avg Wind Dir Avg. Wind Speed Max Wind Gust
Mt Coffin 24 º F 24 Southwesterly 21 54
View Temperature and Wind Graphs View Mt Coffin 48 Hr Wind Graph
Location Elevation Snowfall/Prec. Total Snow Depth Total Snowfall
Comissary Ridge Plot 9,330' 0"/ 0.00 41" 91"
Blind Bull Meadow Plot 9,000' 0"/ 0.00" 34" 76"
Box Y Ranch Plot 6,300' 0"/ 0.00" 23" 51"
Mountain Weather Forecast for Today
Expect mostly clear skies as a transitory ridge of high pressure builds over the region.
Temperature forecast for 8,000 - 9,000  
Rising into the low 30s.
Ridge Top Wind Forecast for 10,000´
Southwesterly at 10 to 20 miles per hour.
Snowfall Expected Next 24 Hours
0
General Avalanche Advisory
Skiers and riders could trigger small to large wind slabs on steep, wind loaded slopes above 7,500 feet. Warming temperatures and sunshine will increase the likelihood of triggering these slabs as the day progresses. While less likely, large persistent slabs remain a threat to backcountry travelers. In addition to the possibility of being human triggered, these slabs could also fail from the release of a wind slab. Shallow point slides will be likely on sunlit aspects in the afternoon. Monitor warming temperatures and their effect on the snowpack. Don’t let blue skies impair your judgement, and be willing to alter your travel plans if conditions warrant. Below 7,500 feet, skiers and riders might be able to trigger a shallow soft slab on very steep slopes.

Today's Avalanche Problems

Wind Slab

ASPECT/ELEVATION
Avalanche problem rose
CHARACTERISTICS
LIKELIHOOD
Certain
Very Likely
Likely
Possible
Unlikely
SIZE
Historic
Very Large
Large
Small
TREND
Increasing trend

DESCRIPTION

Southwesterly to westerly ridgetop increased to 20 to 30 miles per hour Friday night and remained strong throughout the day on Saturday. These conditions continued to build stiffer wind slabs in leeward terrain and on cross loaded slopes. Backcountry travelers could trigger these slabs to depths of one to two feet in steep, wind loaded avalanche terrain.

Persistent Slab

ASPECT/ELEVATION
Avalanche problem rose
CHARACTERISTICS
LIKELIHOOD
Certain
Very Likely
Likely
Possible
Unlikely
SIZE
Historic
Very Large
Large
Small
TREND
Steady trend

DESCRIPTION

Faceted weak layers that formed during the November dry spell exist in the lower portion of the snowpack, and skiers and riders still have the potential of triggering slab avalanches up to three feet deep above 7,500 feet. This hazard is more of a concern in terrain with shallower snow depths. In these areas, temperature gradients have been stronger and the weak layers are more easily impacted. Large triggers, such as snowmobiles, may be more likely to initiate these persistent slabs.
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