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Today’s avalanche problems will be Wind slab and Dry loose. It will be possible to human trigger small Wind Slabs in specific terrain, at upper elevations, on leeward aspects and cross loaded features, on West through North aspects. Small Dry loose avalanches will be possible to human trigger at all elevations, and on all aspects, on slopes 40° degrees and steeper. Natural avalanches are unlikely.
Riding conditions have improved but coverage is still thin, especially near ridgetops.
Join us on Zoom Sunday, February 28th at 7:00pm to meet the HPAC founders and forecasters! You’ll get a chance to meet Jed, Allie and Jake, and learn about the state of the snowpack in Hatcher Pass. This is a great opportunity to gain a better understanding of the current conditions, and get to know the folks who help keep us informed about backcountry conditions. Sign up is required, so stay tuned!
Peak 4068 NE: A small natural wind slab was reported.
Marmot 4000’ SW face: a small natural wind slab was reported.
Pictured below: Marmot Mid Rib 3800’ W/NW Aspect: A small, sensitive, human triggered wind slab was observed up to 80’ in width in a cross loaded gully.
Signal Word | Size (D scale) | Simple Descriptor |
Small | 1 | Unlikely to bury a person |
Large | 2 | Can bury a person |
Very Large | 3 | Can destroy a house |
Historic | 4 & 5 | Can destroy part or all of a village |
Moderate winds with strong gusts from the SE blew for 6 hours on 2/17. These winds have created small wind slabs in specific areas with slabs averaging 1-8” thick and in very isolated locations up to 1 foot thick. These are located at the mid and upper elevations on west thru north aspects. These wind slabs will be small in size and possible to human trigger today. Natural avalanches are unlikely. We expect the wind slab problem to improve over the next 24 hours.
Shooting cracks are a red flag for Wind Slabs. Look for smooth freshly drifted snow overlying weak snow when trying to identify this avalanche problem. Pole tests and hand pits will help you quickly identify this avalanche problem
Even a small avalanche could sweep you through rocks or other hazards and cause injuries. Use safe travel techniques when traveling in or around avalanche terrain. We recommend spreading out when ascending slopes, descend slopes one at a time, and choose safe zones that are out of harm’s way.
Signal Word | Size (D scale) | Simple Descriptor |
Small | 1 | Unlikely to bury a person |
Large | 2 | Can bury a person |
Very Large | 3 | Can destroy a house |
Historic | 4 & 5 | Can destroy part or all of a village |
On 2/16 Hatcher Pass received 5-6” of new, low density snow. It will be possible to human trigger small dry loose avalanches in wind protected areas, at all elevations, on all aspects, on slopes 40° or steeper. Natural avalanches are unlikely.
Overall there is approximately 1-2 feet of soft, newer snow from the last several storms sitting over older, weaker snow, made up of near surface facets. In isolated locations, in steep terrain, it will be possible to trigger all of this new snow, resulting in larger volume dry loose avalanches.
Winds and warmth have affected the surface of the snow in specific areas, resulting in an upside down snowpack within the top few inches of the snowpack. This has made dry loose avalanches less widespread than they were previous to this last storm.
Practice good sluff management if you choose to venture out into steeper terrain. These avalanches will be small but can catch, carry and sweep you through hazards such as rocks, cliffs and terrain traps if not managed properly.
New snow totals 2/14-17
Independence Mine: 5-6″
Frostbite Bottom: 3-4″
Temperatures started the week in the low teens, with clear sky and sunny weather. As the week progressed a storm system began to move into the forecast zone. As the storm began to move closer to Hatcher Pass on Feb 15th, temperatures began to rise into the mid 20s. Early in the morning on Feb 16th snow began to fall and by the end of the day 5-6” of snow had accumulated. On Feb 17th moderate to strong SE winds were able to transport this new snow and was able to scour ridge tops. The NWS is calling for 2-4″ of new snow today with light and variable winds, and temperatures rising to 28°F at 3000′. A pattern change is starting tonight with colder temperatures dropping into the single digits and teens through the weekend.
Marmot 4500′ Last 24 Hours:
NWS Rec Forecast here.
NWS point forecast here.
State Parks Snow Report and Motorized Access information here.