Haines Avalanche Center

Forecast Expired - 01/27/2022

Above 2,500ftModerate

1,500 to 2,500ftModerate

Below 1,500ftModerate

Degrees of Avalanche Danger

Low
Moderate
Considerable
High
Extreme

Avalanche Problems

Problem 1

Persistent Slab:

Aspect: Mainly on wind-protected slopes, and below terrain features on W-NW-N-NE aspects

Elevation:  Above 1500′

 

Bottom Line: Our last storm was the Atmospheric River event last weekend, which brought multiple feet of new snow and strong southeast winds in the alpine. Wind slabs formed during that storm have had about 4 days to settle and bond, which is good. But it may still be possible to trigger old wind slabs in steep terrain, or in wind-protected areas. There was a surface hoar event right before the storm came in, and these recent wind slabs may be resting on this dangerous weak layer in wind protected areas. 

 

Travel Advice: Keep a wide safety margin in the alpine. Buried surface hoar layers are notoriously tricky to assess. You may find areas where the new wind slabs are well bonded which can lead to false confidence if you venture into a new area where surface hoar lingers beneath. Carefully evaluate each slope, and plan for surprises.

 

Photo below: Widespread surface hoar in the alpine on Flower Mountain, 1/20 (right before the last storm came in)

Likelihood:

  • Almost Certain
  • Very Likely
  • Likely
  • Possible
  • Unlikely

Size:

  • Historic
  • Very Large
  • Large
  • Small

Trend

  • Increasing
  • Steady
  • Decreasing

Avalanche Activity

01/15/2022 – An observation from Four Winds Mountain reported a collapse and a remote trigger of an approximately 200′ wide avalanche at 3,000′ on a northern aspect. It was estimated to run a couple hundred feet but low visibility kept observations to a minimum

 

01/17/2022 – On solar aspects past Mosquito Lake and above Lutak Inlet small point releases were reported above treeline on steep alpine features.

 

01/22/2022 – A D3 wet slab avalanche was reported in the Chilkat Inlet with a starting zone around 2,000′ that entrained dirt and mud near Witches Tit. Numerous D2 storm snow slides were observed near Pyramid Harbor.

 

Weather

Forecast:

Snow levels should bounce around between 0 and 1,500ft Thursday-Saturday, as a new storm complex moves in. 18-36″ of new snow is likely above 1,500ft by Saturday night, with moderate SE winds. A brief cooling/drying trend is likely on Sunday.

Seasonal Summary:

  • An Atmospheric river hit Jan 21-22. It brought in 2-7″ of SWE (2-5ft of snow above 2500ft, mostly rain below)
  • Jan 9th-15th brought 24-48″ of new snow in the alpine, with some light rain up to 3,500ft, followed by heavier rain up to 2000ft.
  • Very strong NW winds and arctic temperatures blasted the area the first week of January
  • Jan 1st: New snow (20″ in Lutak, 7″ Transitional zone) buried any preserved surface hoar.
  • Moderate NW winds hit exposed slopes Dec 19-20th
  • Surface hoar formed on all aspects and elevations Dec 17-18th
  • December brought in about 2-5 feet of snowfall (highest in Lutak zone), and a few strong NW wind events
  • November brought consistent heavy snowfalls, cold weather, and SE winds
  • October brought heavy snow in the alpine, followed by a few rain/sun crusts
 Snow Depth [in] Last 24-hr Snow/SWE [in] Last 3-days Snow/SWE [in]  Today’s Freezing Level [ft]  Today’s Winds Next 24-hr Snow/SWE
Mount Ripinsky @ treeline **  76″  0″ / 0.00 *  3″ / 0.30*  1000′  light, SE   12″ / 0.90*
Flower Mountain @ treeline  64″  0″ /0.00″  0″ /0.00″  1000′  light, SE   8″ / 0.60 “
Chilkat Pass @ 3,100ft  23″  0″ / 0.00  0″ /0.00″  1000′  light, SE   6″ / 0.45 *

( *star means meteorological estimate )

** The Ripinsky weather station is in need of repair, and will likely be down until Summer.

Additional Information

Ride rescue ready. Be prepared for an emergency. Prevent hypothermia. Carry bear spray. Winter is a high consequence environment.

Become a sustaining Haines Avalanche Center Member by clicking the poster or visiting dev.alaskasnow.org/joinHAC. Support local forecasts, observations, education and weather stations. Join a community of winter recreationalists. Benefit from collective knowledge and skills. Help keep your friends and family safe in the backcountry. Get a free limited edition mountain buff, or neck gaiter with a $50 membership (first 20 members!).

 

Practice like you play. Make sure all your rescue gear is fully functional and your beacon has NEW batteries. Make sure 1) everyone in the group has a functioning beacon, shovel and probe 2) knows how to use them and 3) has trained in companion rescue in the last year. Keep your skills fresh. If you head into the hills, watch out for red flag avalanche conditions, natural avalanches, whoomphing or collapsing, and shooting cracks.

 

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