SOUTHWEST TRAILS/GREY'S RIVER AREA FORECAST

Issued at 01/28/2020 06:44   Valid until: 01/28/2020 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 12 º F 15 West-Northwesterly 36 62
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' 3"/ 0.30 87" 260"
Blind Bull Meadow Plot 9,000' 2"/ 0.20" 67" 200"
Box Y Ranch Plot 6,300' 2"/ 0.15" 42" 138"
Mountain Weather Forecast for Today
Snow showers are to develop today as the next system moves into the area. Snowfall is to continue overnight.
Temperature forecast for 8,000 - 9,000  
Rising into the mid-twenties.
Ridge Top Wind Forecast for 10,000´
West-southwesterly at 10-20 mph.
Snowfall Expected Next 24 Hours
2-6
General Avalanche Advisory
Wind slabs have been forming above 8500 feet over recent days. These slabs could fail with varying depths. Backcountry travelers are encouraged to remember that initially small slides can pick up significant amounts of snow in runs that are steep and long. Additionally. small slides can quickly sweep people into or over cliff areas and rocks in exposed terrain. Deep slab instabilities continue to be a concern above 7500 feet where larger triggers such as a moving wind slab or snow machine have some potential to trigger large avalanches. Avalanches are unlikely at the low elevations except for in isolated pockets.

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

At the upper elevations wind slabs formed by northwest to southwest winds could be triggered on steep terrain features. These slabs are failing on recent density breaks and could have depths of 6 inches to 2 feet deep and could become a significant hazard in very steep chutes, and above cliff areas and terrain traps.

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

Some potential continues for deep hard slab avalanches to occur. Although the likelihood for these avalanches to be triggered is low the consequences of triggering a slab avalanche 3 to 7 feet deep is likely to be fatal. These dangerous slabs are most likely to fail when a larger impact such as a snow machine or a moving surface slab impacts a thin, weak spot on a slope.
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