Avalanche Hazard Assessment for Northwest - BC
Thu Apr 21, 2011 - 09:18
Weather Observation Summary Snowpack Observation Summary Avalanche Observation Summary
Broken skies.
FL dropped to near VB overnight (-3.8 @720m). Current temp is -1.6 @720m.
Winds were variable from light to strong from the SW (strongest near B Pass)
Suspect pockets of WSL in lee ALP/TL - N-E aspects
Suspect good overnight freeze.
Remaining very winter-like in most places.
No new reports of activity.
Recent observations from the Galleon (Babines,
Cassiar and Ninginsaw Pass.

Snowpack Overview

SH reported inland, down 80cm and reactive (Apr 14)

mid-pack seems to be generally strong

Diurnal melt-freeze spring pattern starting: low elev & steep solar.
Becoming isothermal below 800m.

sensitive cornices
Icefall

HS 5m+ in coastal zones
Thin, variable, wind-affeced and FC'ed in some inland areas

ALPINE Hazard Chart ALPINE Avalanche Problems
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Problem Location Distribution Sensitivity Contr.
Wind Slab
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Old on Exposed lee and cross loaded terrain. Strong SW winds. Specific Touchy 40%
Persistent Slab
April 03 SH (Apr. 3rd)
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E asp @ TL suspected. Could be elsewhere. Convex and unsupported. Specific Stubborn 40%
Info from around Hazleton. Touchy but appears confined to small pockets.
Cornice
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Ridge crests Isolated Stubborn 20%
May weaken and fail w/ warming and solar
ALPINE Danger Rating ALPINE Comments
Moderate Fair confidence
No new information

TREELINE Hazard Chart TREELINE Avalanche Problems
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Problem Location Distribution Sensitivity Contr.
Wind Slab
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Exposed lee and cross loaded terrain. Strong SW winds. Isolated Stubborn 40%
Persistent Slab
April 03 SH (Apr. 3rd)
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E asp @ TL suspected. Could be elsewhere. Isolated Stubborn 40%
Info from around Hazleton. Touchy but appears confined to small pockets.
Loose Wet
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Steep solar aspects in the PM Specific Touchy 20%
Watch for periods of sun and daytime warming
TREELINE Danger Rating TREELINE Comments
Moderate Fair confidence
No new information

BELOW TREELINE Hazard Chart BELOW TREELINE Avalanche Problems
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Problem Location Distribution Sensitivity Contr.
Loose Wet
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Steep solar aspects in the PM Specific Touchy 100%
Watch for periods of sun and daytime warming
BELOW TREELINE Danger Rating BELOW TREELINE Comments
Low Fair confidence
No new information

Terrain Discussion
No discussion included.

Forecaster: PM
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