SOUTHWEST TRAILS/GREY'S RIVER AREA FORECAST

Issued at 02/21/2019 06:41   Valid until: 02/21/2019 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 -5 º F 2 North-Northwesterly 8 42
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' 2"/ 0.10 89" 271"
Blind Bull Meadow Plot 9,000' 1"/ 0.05" 70" 200"
Box Y Ranch Plot 6,300' 1"/ 0.05" 58" 126"
Mountain Weather Forecast for Today
Skies will be partly to mostly cloudy with a chance for snow showers, especially in the most southern and eastern portions of the forecast area
Temperature forecast for 8,000 - 9,000  
Temperatures will rise into the teens.
Ridge Top Wind Forecast for 10,000´
Winds will be from the east at 10 to 20 miles per hour with higher gusts.
Snowfall Expected Next 24 Hours
Trace to 2
General Avalanche Advisory
Humans who venture onto steep avalanche prone slopes could trigger slab avalanches. These slabs could release in wind loaded areas, involving snow from the recent storm cycle or they could fail on deeper weaknesses, involving faceted snow that formed during dry periods earlier in the season. Identify and avoid steep, wind loaded terrain features and evaluate the snowpack carefully to determine where old weaknesses still pose a threat.

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 during the most recent storm cycle continue to be a potential hazard on steep, wind-loaded slopes at the higher elevations. These slabs could be triggered by the weight of a single person and could be one to three feet deep.

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

In steep terrain dangerous, persistent slabs could be triggered by humans on buried layers of faceted snow. These slabs could be triggered by a single person who crosses a weak spot on a slope, by the initiation of a wind slab, or more likely by a heavier triggers such as a one or more snowmachine. These large to very large slab avalanches could be 3 to 5 feet deep at the mid and upper elevations or one to three feet deep at the lower elevations.
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