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|
 PROFESSIONAL OBSERVATION FORM |
Start Date: 01.26.19 |
Name: Lundy |
Operation: SAC |
Drainage/Route: Prairie Peak |
Observed Terrain: 7000-9500, SE-E-NE |
Zone/Region: Smoky & Boulder Mountains |
|
 WEATHER OBSERVATIONS |
HN24: |
HST: |
Sky: SCT |
Precip: |
Temps: |
Ridgeline Wind:
Strong from the NW |
Blowing Snow: Prev |
Snow Available for Transport: None |
Comments: Stronger winds atop Prairie Peak than what was showing at Titus. Upper 500 vertical feet was strafed by the northerly winds, northeast side was scoured sastrugi and the southeast side was extensive hard slab |
|
 AVALANCHE OBSERVATIONS |
No. |
Location |
Date |
Size |
Type |
Trigger |
Aspect |
Elevation |
Comments |
Several |
Solar aspects in the Boulders |
Today |
1 |
WL |
N |
S |
upper |
|
Comments: Numerous other rollerballs visible in the high Boulders as well. |
|
 SNOWPACK OBSERVATIONS |
HS: |
70cm at low elevations off the highway, ranging to 120-150cm on upper elevation shaded. Obs below from 9100', NE |
Upper Pack: |
F to 4F DF and FCsf |
Middle Pack: |
1F to P RG |
Lower Pack: |
30cm FC and DH, 4F at top of layer quickly becoming 1F below. Dry. |
|
 AVALANCHE PROBLEM ASSESSMENT |
|
 STABILITY TESTS |
Stability Test Results: 9100', NE, 25*: HS 135cm, PST 30/100end, cross slope PST 40/100end. Based on where these tests ended up fracturing, the columns should have been 110cm, but I suspect they were still reasonably valid tests. |
 SNOW STABILITY |
Snow Stability Rating for your observed area: |
Confidence: |
Trend: |
|
 BOTTOM LINE |
Comments: Deeper snowpack in this area than I was expecting. Thought it might be more like Butterfield/Baker Creek but it was deeper and consequently stronger. Basal facets finally seem to be showing signs of strengthening and being compressed from the overlying slab - but the PST results were still a heads up. |
 FILE ATTACHMENTS |
 190126_galena_pk_rollerballs.jpg |
Roller balls on Galena Peak |
 190126_prairie_pk_snowpit.jpg |
Cross slope PST 40/100end 110cm down. The block should have been wider. |
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