Avalanche: Juneau Mainland

Location: Snowslide Creek on Thane Road

Date:

December 1, 2020 1:40pm

Observer:

Pat Dryer Professional

Route & General Observations

Observation of avalanche in Snowslide creek above Thane Road.

Avalanche Details

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Trigger	Natural	Avalanche Type	Unknown
Aspect	Southwest	Elevation	unknown
Slope Angle	unknown	Crown Depth	unknown
Width	unknown	Vertical Run	unknown

Avalanche Details

Large natural avalanche D3/R3.5 in Snowslide creek above Thane Road at 13:40 12/1/2020. The crown was obscured by clouds during daylight hours. Avalanche ran full path nearly reaching Thane Road. Photos were taken immediately after the avalanche. There as a smaller D2/R1 avalanche earlier in the day.

Red Flags

Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.

Obvious signs of instability

Recent Avalanches?	Yes
Collapsing (Whumphing)?	No
Cracking (Shooting cracks)?	No

Observer Comments

Recent heavy snowfall
Warming temperatures
Extreme winds
Other natural avalanches in the area

Weather & Snow Characteristics

Please provide details to help us determine the weather and snowpack during the time this observation took place.

Weather

24hour weather summary from 0600 11/30 to 0600 12/1
HN24- 50 cm (20")
HNW24 estimated at 3" (tipping bucket had malfunctioned overnight)
Peak wind gusts from 72 mph at the Mt Roberts Tram to 129mph recorded on Sheep Mountain
Tcurrent= -0.1 C
Tmin= -2.4C
Tma= 0 C

Another 48mm (2") of SWE was recorded at the Mt Roberts tram from 0600 to 1400 on 12/1

Photos & Video

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Debris near Thane Road

Snowslide Creek from Douglas Boat Harbor

Location

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