The Bottom Line: The hazard rating above treeline is MODERATE. The snowpack currently has good strength and FAIR structure. The primary concern is surface slabs, up to 1', sitting on old rotten snow (Near Surface Facets and isolated pockets of Surface Hoar). Triggering a slab avalanche is possible in specific locations: steep, wind loaded terrain - ESPECIALLY where the slabs have built upon weak snow. ALSO, glide cracks may release into avalanches at any time . . . limiting/avoiding exposure under them is prudent.
Problem 1: Persistent Slab - (Wind Slab)
Distribution: Isolated slide paths above treeline. Size: small. Likelihood: possible. Sensitivity: stubborn.
Description: The north wind increased on Jan 18th and IS forming new wind slabs on a variety of surfaces including widespread facets and surface hoar. Quick pits (using hands or poles) can help to determine stiffer snow over weaker snow as a sign of slab on a weak layer. Be suspect of wind-loaded features and as always, evaluate the terrain for consequences and use safe travel protocols.
Problem 2: Glide Avalanches.
There are open cracks from the port to 42 mile between 3500-4000' on multiple aspects and on January 8th there was a full release near mile 31 and there were multiple full releases on the Deserted glacier between Jan 12-18. It is important to remember glide cracks can release at any time and are not associated with human triggers. New snowfall is covering up these gaping, crevasse-like features so use caution particularly when traveling in FLAT LIGHT. The best way to manage this problem is to limit (AKA avoid) travel underneath and beside them.
The current list of known open glides cracks from West to East:
A natural wind slab avalanche released near 27-mile glacier above the DOT station in steep cross-loaded terrain. The avalanche probably occurred on Jan 19th.
A small wind slab was intentionally triggered on Jan 15 in North Odyssey Gulley at 3300' on a wind loaded feature. 10" crown, 30 yards wide.
Please share your field observations including signs of stable snow HERE.
Monday is forecasted to be mostly cloudy with moderate+ north winds, temps between 10F and freezing, with a small amount of snow accumulation.
The most recent NWS rec Forecast can be found HERE:
342 PM AKST Sun Jan 20 2019
The Thompson Pass Mountain Forecast covers the mountains (above
1000 ft) surrounding Keystone Canyon through Thompson Pass to
Temp at 1000` 10 F 21 F
Temp at 3000` 16-23 F 27 F
Chance of precip 60% 60%
(above 1000 FT) 0.08 in 0.11 in
(above 1000 FT) 0-1 in 0-2 in
Snow level sea level 400 ft
Wind 3000` ridges NE 4-36 mph E 2-20 mph
SNOWPACK BIG PICTURE: The snowpack has gained strength since the last major storm and avalanche cycle over New Years. No significant avalanche activity has been reported since then.
Recent snowpack history, from top to bottom:
Jan 13-19 was mostly clear and dry with light to moderate north winds. Widespread Surface Hoar growth.
Jan 12-13 brought 3-10" of new snow with little wind.
Jan 4-12 was VERY cold and dry: moderate winds and wind chill reaching -50F. Pockets of surface hoar and widespread Near Surface Faceting.
Dec 30-Jan 3 The New Year's Eve storm brought nearly 2.5" of SWE to Valdez and almost another 1" (SWE) on the 2-3rd of January. The rain line was 1200' during the Jan 2-3 storm, forming a 1-3" crust locking up all the snow beneath it. These storms accumulated over 3' above 2000' near Thompson Pass. Both of these storms had little wind.
Above 4000' the snowpack averages well over 300cm deep and has good strength and structure (few lemons). Below 4000', the snowpack is significantly shallower and has old problem layers that are bonding well (rounding) and currently dormant: facet-crust combos and BASEL facets (all the way to sea level).
If you get out riding, please send in an observation.
Do a rescue practice with your partners. Always carry a beacon, shovel, and probe, and KNOW HOW TO USE THEM.
Practice good risk management, which means only expose one person at a time to slopes 30 degrees and steeper, make group communication and unanimous decision making a priority, and choose your terrain wisely: eliminating unnecessary exposure and planning out your safe zones and escape routes.
There is no current hazard rating for the Valdez region. Several days of snow with light winds are expected which should mean STORM SLABS are building and the hazard is increasing. New snow will sit on a variety of surfaces including widespread surface hoar and near-surface-facets which will provide a fast bed surface and weak layer. New slabs may be TOUCHY and easy to trigger.
Click FULL FORECAST for Monday's forecast and more safety information. Please share your field observations HERE.
There are a lot of events coming up in January, check out our Facebook page for the complete list.
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