Monday March 12, 2018
Cornice Fall, Loose Wet
Travel & Terrain Advice
Avoid avalanche terrain on solar aspects in the afternoon and give cornices a wide berth when on ridgetop or below.
Size 1 natural loose wet avalanches from steep solar aspects in the afternoon at treeline and below mostly originating from rocks and trees.
Warming will create instabilities in the large cornices that have formed this winter. Natural cornice falls are possible and human triggered activity is very possible. Exposed ridges on NW through NE aspects at treeline and above could produce up to size 2 avalanches.
Solar radiation and warm temperatures will cause instabilities within surface snow. Expect natural loose wet activity from steep sunny terrain at all elevations in the afternoon. Human tiggering is highly likely. Size 1-1.5.
No new snow since Thursday, which has settled and bonded well to previous old surfaces. Warm temperatures and high freezing levels on Sunday created moist snow on all but polar alpine aspects which remain dry. Clear skies overnight have created melt freeze crusts on previously moist aspects. Recent winds have grown cornices at ridgetop on NW through NE aspects.
|Surface||Diurnal melt freeze with the exception of polar alpine aspects|
|Upper||Old snow bonding and settling|
Spring diurnal. Warm during the day, cold at night. Light winds and no new snow.
Monday - Clear skies, freezing levels to 2400m. Strong SE winds.
Tuesday - 5-15mm of precipitation. Rain below 1800m with freezing levels from 2000-1200m. Strong SE winds.
Wednesday - Cooling with freezing levels to 800m. Light NW winds.
Posted on Monday March 12, 2018 by Dan Goodwin