Observation: Franklin Basin

Observation Date
1/2/2020
Observer Name
Eric and Amy Flygare
Region
Logan » Southeast Idaho » Franklin Basin
Location Name or Route
Franklin Basin
Weather
Sky
Overcast
Precipitation
Light Snowfall
Wind Speed
Strong
Weather Comments
Gnarly, windy, foggy, and whiteout today. It was a bit of a crazy day in the mountains. Route finding was extremely difficult most of the day with visibility hovering around zero.
Snow Characteristics
New Snow Depth
12"
New Snow Density
Medium
Snow Surface Conditions
Powder
Snow Characteristics Comments
We found surprisingly decent snow riding conditions today. A lot of wind and a fair amount of graupel, but the snow rode well. We were also annoyed most of the day by rime sticking to everything....especially our goggles.
Red Flags
Red Flags
Wind Loading
Poor Snowpack Structure
Red Flags Comments
Wind and buried surface hoar were our biggest concern today. We stayed on low angled slopes and found smooth, fairly fast snow to play in.
Avalanche Problem #1
Problem
New Snow
Trend
Same
Problem #1 Comments
A solid foot of high density snow that's sitting on buried surface hoar was a big concern. More snow continued to fall through the day.
Avalanche Problem #2
Problem
Wind Drifted Snow
Trend
Increasing Danger
Problem #2 Comments
Nasty wind all day today. Not much fun at any elevation we were at. Ridges were nuts.
Comments
We had a fun, but short day in the mountains today. We spent a few hours in upper Franklin Basin on the Idaho side of the line. Winds were raging today, and visibility was horrible. We had plans to hit a low angle go to, that includes a nice open bowl. That was a bad idea. We had to bail out of that one before we were half way up the climb because we had no idea where we were. Visibility was about the end of your nose. We tried another low angle go to that has a few more trees and laughed the whole way up it because we weren't sure where the crap we were. Ultimately, we ended up riding a few mellow trees and came home early.
Eric and I both dug test pits about the same elevation and at different aspects. Both pits were around 8800' in elevation. My pit was facing East-southeast and on a mellow 27 degree slope. Total snow depth was just shy of 4 feet. My two compression tests yielded failures at 2 taps and 1 tap (from the wrist) and failed on the new/old snow interface where I found buried surface hoar (about 12" down). The second half of the test saw failures at 28 taps and 27 taps (from the shoulder). This failure was near the bottom of the snowpack (about 14" from the ground) and sheared clean. I also conducted an extended column test. One tap from the wrist and the top 12" popped out. ECTP1 with a Q1 shear. Yikes!
Eric's pit was on a North East facing slope also at about 8800' in elevation. He found about 65" of total snow on the ground and conducted his test on a 26 degree slope. Compression tests failed at CT3 and CT4 on the top 10". And he also had failures in the same columns at CT 16 and CT 20 right at the ground. He also conducted an extended column test and had a failure at ECTP6 (failing at the new/old snow interface about 10-12" down". We were glad we chose mellow lines today, even if it was the gnarly weather that mandated it.
Today's Observed Danger Rating
Considerable
Tomorrows Estimated Danger Rating
Considerable