11th Annual Utah Snow & Avalanche Workshop Open and Motorized Sessions Oct. 27th.
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Observation Date: 
12/31/2017
Observer Name: 
Brett Verhoef
Region: 
Logan
Location Name or Route: 
Bear River Range, Garden City Bowls
Weather
Sky: 
Clear
Weather Comments: 
Clear and cold after a clear cold night.
Snow Characteristics
Snow Surface Conditions: 
Powder
Wind Crust
Snow Characteristics Comments: 
1/2" to 3/4" thick collapsible, hollow wind crust on the ridge between Swan Flat road and Garden City Bowls. Similar wind crust on the northeastern slopes of Garden City Bowls. Powder in the central Garden City Bowls.
Red Flags
Red Flags: 
Wind Loading
Collapsing
Avalanche Problem #1
Type: 
Wind Drifted Snow
Problem #1 Comments: 
On top of the ridge there was clearly snow transport from the previous few days.
Avalanche Problem #2
Type: 
Persistent Weak Layer
Problem #2 Comments: 
A snow pit on the northeastern slopes of the Garden City Bowls area showed the presence of the persistent weak layer (4 to 6" thick faceted sugar) below the Christmas storm snow (10 to 12" of dense powder).
Snow Profile
Aspect: 
East
Elevation: 
8200
Slope Angle: 
30
Comments: 
Despite the snowpack observations of a persistent weak layer below the Christmas snow slab, no collapsing or cracking was observed on the 30° slopes in the northern end of the Garden City Bowls area. This was contradicted by an ECTN test that collapsed at 16 strikes. It appears the storm slab is strong enough to support a skier, which may not be the case everywhere, especially in areas around trees and rocks where the slab may be thinner. These slopes had been skied at least a half dozen times in the last two days.
Today's Observed Danger Rating: 
Considerable
Tomorrows Estimated Danger Rating: 
Considerable
Snow Profile Coordinates: 

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