21-22

GNFAC Avalanche Forecast for Fri Mar 25, 2022

Snowpack and Avalanche Discussion

<p>With high temperatures forecasted to be 5 F warmer than yesterday, wet snow avalanches are the primary concern today. Sunny skies and warm temperatures don’t feel as ominous as a big storm, but they can create avalanche conditions that are just as dangerous.&nbsp;</p>

<p>A decent refreeze overnight has formed a stout crust on most slopes. Conditions will become more dangerous as the crust breaks down. The faster temperatures climb, the less windy it is and the less cloud cover there is - the more quickly dangerous conditions will develop. Wet loose avalanches are the most likely problem you’ll encounter today, but big, deadly, wet slabs are also possible. If you’re sinking more than ankle deep into wet snow it’s time to get off steep, sunny slopes (<a href="https://youtu.be/g0T8RQK3oN0"><strong><u>video</u></strong></a&gt;). Plan to be off steep slopes early and keep steep low elevation slopes you’ll need to cross to get home at the end of the day in mind as you’re route planning. Cornices have also been breaking off with these warm temperatures, so think twice before spending much time beneath them.&nbsp;</p>

<p>Yesterday, skiers triggered an avalanche that broke 3 ft deep and 300 ft wide in Republic Creek, south of Cooke City (<a href="https://www.mtavalanche.com/node/26321"><strong><u>details</u></strong>… href="https://www.mtavalanche.com/images/22/republic-creek-avalanche"><u&gt; </u><strong><u>photo</u></strong></a>). It broke across three adjacent gullies and caught three skiers, burying one with only an arm sticking out of the snow. Two of the skiers were injured but thanks to prompt rescue efforts by their partners, the outcome was not worse. Natural slab avalanches were also seen on Sawtooth Mountain near Cooke City (<a href="https://www.mtavalanche.com/images/22/sawtooth-avalanche"><strong><u>ph…;) and in the Lone Lake Cirque (in the backcountry outside Big Sky Ski Resort, <a href="https://www.mtavalanche.com/images/22/lone-lake-cirque-slab"><strong><u…;). Any slope with wet snow at the surface should be suspect, but cold, dry, shady slopes aren’t a get out of jail free card&nbsp; - you could still trigger a dry slab avalanche there on the weak layers buried 1-3 ft deep.&nbsp;</p>

<p>Wet snow avalanches are particularly hard to predict. Give yourself big safety margins and don’t try to outsmart the snowpack as it goes through a rapid change.</p>

<p>Both wet and dry avalanches are possible today and the avalanche danger is rated MODERATE.&nbsp;</p>

<p>If you get out, please send us your observations no matter how brief. You can submit them via our website, email (mtavalanche@gmail.com), phone (406-587-6984), or Instagram (#gnfacobs).</p>

<p>&nbsp;</p>

Natural avalanche on Sawtooth Mountain

Goose Lake
Cooke City
Code
SS-N-R2-D2
Latitude
45.11530
Longitude
-109.91400
Notes

Slab avalanche on Sawtooth Ridge in the Wilderness north of Cooke City. Observed 3/23 and appeared to be recent. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year

Dry Slab in Lone Lake Cirque

Lone Lake Cirque
Northern Madison
Code
HS-N-R2-D2
Latitude
45.27710
Longitude
-111.46400
Notes

Dry slab avalanche observed in the Lone Lake Cirque that broke overnight 3/23 or early 3/24. 

Number of slides
1
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Vertical Fall
200ft
Slab Width
100.00ft
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Single Avalanche
Advisory Year