Week in Review for 3/10/2018 - 3/16/2018

Dates of the Week: 
3/10/2018 to 3/16/2018
Avalanche Problems: 
General Snowpack Structure: 


  • PWL gains strength most evidence points to layer going dormant with a few outliers
  • Slab above PWL continues to consolidate
  • Added rain crusts to snowpack above the snow from the beginning of March.
  • Friday adds storm snow and wind slabs to snowpack above the rain crust.
Weather Events: 


  • Weak warm storm with little precip passes through the area on Sat-Sun
  • Warming and clearing Mon
  • Significant storm on Tuesday-Wed. Starting with rain up to at least 9200 probably higher. Ending with 15 to 22 inches of snow by Thursday morning
  • Small break in the weather on Thursday morning before another significant storm starts Thursday afternoon and runs through Sat. (28 to 50 inches of new snow)
  • Strong to gale force SW winds during the storms.

Central Sierra Nevada / Lake Tahoe Snowpack, Weather, and Avalanche Observations for California and Nevada from SAC

Date and time of observation or avalanche occurrence Location Region Observation Type Photos Snowpack, Avalanche, Weather Videos Snowpit videos (tests, etc) Observation made by
03/18/2018 - 13:30 Incline Peak NE Bowl Mount Rose Area Avalanche Observation Mid slope looking at the crown line and bed surface View down to debris pile Extent of debris field up to crown Warming near rock Additional crown line in the bowl Cornice collapse at summit Public
03/18/2018 - 13:00 Incline Lake Peak Mount Rose Area Snowpack Observation Forecaster
03/18/2018 - 12:45 Andesite Peak Donner Summit Area Snowpack Observation RB4 near Andesite Peak Public
03/18/2018 - 12:15 Rose BC - Mt Houghton Mount Rose Area Avalanche Observation Public
03/17/2018 - 12:30 Andesite Peak Donner Summit Area Avalanche Observation The second of two intentionally skier triggered wind slabs in E aspect terrain above treeline. The first of two intentionally skier triggered wind slabs in E aspect terrain above treeline. Two foot crown. 1.75 m (5.75 ft) of storm snow. CTH results with broken failure planes within the storm snow. ECTX in same pit. Signs of storm snow settlement on tree cones at 10am. The second of the two triggered wind slabs. Initial efforts created loose dry. Once the wind slab was triggered from a more prime location, the slab propagated back through the area that had previously failed as loose dry closer to the snow surface. Forecaster
03/17/2018 - 10:00 Slab Cliffs Mount Rose Area Avalanche Observation Natural storm slab avalanche Additional photo taken and added to this observation on March 19. Forecaster
03/17/2018 - 03:30 Tamarack Peak Mount Rose Area Avalanche Observation Public
03/16/2018 - 14:00 Powderhouse Peak Luther Pass Area (including Job and Freel) Snowpack Observation One of the few test slopes that produced slab results. Professional Observer
03/16/2018 - 12:00 Andesite Peak Donner Summit Area Avalanche Observation Largest wind slab avalanche triggered by small cornice piece dropped onto the ENE facing slope. A secondary slide released and that crown is 3 to 4 ft. deep. Small wind slab that propagated all the way around an E-ENE-NE facing test slope. Triggered from a low angle slope on the side. Storm slab in below treeline terrain triggered from the lower angle slope I am standing on. Wind slab in near treeline terrain on an ENE facing slope. We cleaned the box on the sign off at the start of our tour and ~3 hours later 6 to 8 inches of snow had accumulated on the box. Forecaster
03/16/2018 - 11:15 Pole Creek Cabin Creek, Deep Creek, or Pole Creek Area Avalanche Observation Intentional skier triggered loose dry avalanche (D1) on road cut at very bottom of Pole Cr Rd. Top of Rd cut slope, HS 115cm, HST 80cm Forecaster
03/15/2018 - 12:15 Elephant's Hump Carson Pass Area Snowpack Observation Pit wall. HS 175cms. Professional Observer
03/15/2018 - 11:30 Powderhouse Luther Pass Area (including Job and Freel) Avalanche Observation 12-16" avy crown debris field Public
03/15/2018 - 01:00 Jakes Peak West Shore Area Avalanche Observation Skier triggered wind slab near top of Peak.  E aspect, 38 degree, 8900'. Wind slab crown. Shooting cracks on small wind loaded test slope. Forecaster