SOUTHWEST TRAILS/GREY'S RIVER AREA FORECAST

Issued at 02/19/2019 06:41   Valid until: 02/19/2019 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 -6 º F 11 Northerly 1 22
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' Trace"/ 0.01 88" 268"
Blind Bull Meadow Plot 9,000' Trace"/ 0.01" 71" 197"
Box Y Ranch Plot 6,300' Trace"/ 0.01" 58" 123"
Mountain Weather Forecast for Today
Periods of light snow possible with partial clearing expected in the afternoon.
Temperature forecast for 8,000 - 9,000  
Rising into the upper teens.
Ridge Top Wind Forecast for 10,000´
Northwesterly at 5-10 mph.
Snowfall Expected Next 24 Hours
0-2
General Avalanche Advisory
The general avalanche hazard is Considerable above an elevation of 7,500 feet and is Moderate below that elevation. Although the sensitivity of unstable slabs is slowly decreasing, in steep avalanche prone terrain, humans could still trigger recently formed surface slabs and dangerous persistent slabs. Wind slabs formed during the most recent storm cycle are a hazard on steep wind-loaded avalanche terrain. Large to very large persistent slabs are most likely to be triggered on steep slopes that had a shallow snowpack with poor snow structure at the end of January. The consequences of triggering a large destructive avalanche are likely to be severe. A careful assessment of the snowpack and conservative terrain choices are essential for snowmobilers and skiers who travel in avalanche terrain.

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
Steady trend

DESCRIPTION

Surface slabs formed by southwest winds during the most recent storm cycle continue to be a hazard on steep wind-loaded slopes. These slabs could be triggered by snowmobilers and skiers with depths of one to three feet. Today's sunshine may increase the sensitivity of these slabs to human triggers.

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

Persistent slab avalanches that would involve faceted snow layers formed earlier in the season could be triggered by snowmachines or the weight of a single person on steep avalanche prone slopes. In addition to being triggered when a person hits a particularly weak or thin spot on a slope, they may also release following the initiation of a wind slab. These large to very large hard slab avalanches could be 3 to 5 feet deep at the higher elevations. They could be one to three feet deep below an elevation of 7,500 feet where they are likely to release as soft slabs.
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