Weather and Avalanche Log for Tue Nov 13, 2018
High pressure breaks down later in the week. Good storm Friday.
High pressure breaks down later in the week. Good storm Friday.
Strong winds in the Bridger Range formed dense slabs on leeward slopes. Yesterday, A skier north of Bridger Bowl triggered multiple wind slabs near the top of Wolverine Bowl. The skier turned around and chose a safer objective. Photo: S. Whitefields
Strong winds in the Bridger Range formed dense slabs on leeward slopes. Yesterday, A skier north of Bridger Bowl triggered multiple wind slabs near the top of Wolverine Bowl. The skier turned around and chose a safer objective. Photo: S. Whitefields
Climbers triggered this very small wind slab on the way to a climb up Flanders in Hyalite (11/11). A tiny slide to a skier can be bad news for a climber since losing one's balance or getting pushed off a cliff can be deadly. From an email (edited):
Photo: S. Magro
Climbers triggered this very small wind slab on the way to a climb up Flanders in Hyalite (11/11). A tiny slide to a skier can be bad news for a climber since losing one's balance or getting pushed off a cliff can be deadly. From an email (edited):
<p>It has snowed somewhere in our forecast area 13 out if the last 14 days (<strong><a href="https://www.mtavalanche.com/weather/wx-avalanche-log">weather log</a></strong>). The mountains around Bozeman and Cooke City have 3-4’ of snow on the ground with 2-4’ measured around Big Sky and West Yellowstone. The snowpack has a good structure: it is dense near the ground and supports our weight and lacks widespread weak layers. This is a positively refreshing start to the season!</p>
<p>Wind-loading is our #1 avalanche concern. On Friday and again on Sunday, ice climbers triggered small avalanches on a wind-loaded slopes up Hyalite (<strong><a href="https://www.mtavalanche.com/avalanche-incidents">details</a></strong>, <strong><a href="https://www.mtavalanche.com/images/18/ice-climber-triggered-slab">photo…;, <strong><a href="https://www.mtavalanche.com/images/18/small-wind-slab-triggered-flander…;) and on Saturday a snowboarder released a wind-slab in Middle Basin north of Big Sky (<strong><a href="https://www.mtavalanche.com/images/18/middle-basin-avalanche">photo</a>…;, <strong><a href="https://www.mtavalanche.com/node/19028">details</a></strong>). Westerly winds are forecasted to pick up today and remain strong until mid-week, blowing powder into wind-drifts that could be easily triggered. A common warning sign on wind-loaded slopes are cracks shooting out in front of your skis.</p>
<p>It is early season and we are still formulating an overall picture of the snowpack. Our <strong><a href="https://www.mtavalanche.com/photos">photos</a></strong> page and <strong><a href="https://www.mtavalanche.com/snowpits">snowpit profiles</a></strong> detail the information we are gathering and are worth a quick study. In general we are conservative in our snowpack assessments this time of year. Last Tuesday a large avalanche was triggered by the Big Sky Ski Patrol (<strong><a href="https://www.mtavalanche.com/node/18990">details</a></strong>), and skiers found weak snow (<strong><a href="https://www.mtavalanche.com/images/18/facets-below-crust">facets</a></s…;) in Hyalite and Cooke City. It’s important to dig and test the snow to rule out potential dangers. Once we get more information and more snowfall we will start issuing daily advisories and danger ratings.</p>
<p>New this season, we added hyperlinks to the <strong><a href="https://www.mtavalanche.com/weather/wx-avalanche-log">Weather and Avalanche Log</a></strong> and a new Menu item <<strong><a href="https://www.mtavalanche.com/avalanche-activity">Avalanches and SnowPits</a></strong>> with information on avalanche activity and incidents.</p>
<p>We are preparing for winter, scheduling avalanche classes, and setting up weather stations. If you get outside send us an observation via our website, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p>
Our education calendar is full of awareness lectures and field courses. Check it out: Events and Education Calendar.
November 14, 1-hr Avalanche Awareness, 6-7pm at Spire Climbing Center
November 14, 1-hr Avalanche Awareness, 6-7pm at Round House Sports
November 26, MSU Snow and Avalanche Workshop, 5-9pm at MSU SUB Ballroom A
@0500: 0F at 9-10,000'
From an email:
"By and large right side up snowpack. Some small facets below the 11/1 ice crust at the ground, but well bonded snowpack overall. Pit observations consistent with hand pits dug throughout the day touring north out of Bridger Bowl." Photo: M. Zia