 New storm &lt;a href=&quot;https://www.sierraavalanchecenter.org/avalanche-terms/slab&quot; title=&quot;A relatively cohesive snowpack layer.&quot; class=&quot;lexicon-term&quot;&gt;slab&lt;/a&gt; cracking on slope undercut by &lt;a href=&quot;https://www.sierraavalanchecenter.org/avalanche-terms/skin-track&quot; title=&quot;Backcountry skiers and some snowboarders ascend slopes using climbing skins attached to the bottom of their skis.&quot; class=&quot;lexicon-term&quot;&gt;skin track&lt;/a&gt;. 