Presidential Range

A sketchy mix of hard, icy surfaces and poorly bonded, reactive wind slabs exists in prime avalanche terrain. Long sliding falls on the icy surface and new wind slabs vie for the dubious honor of being at the top of the list of hazards today. If venturing into steep terrain, bring an ice axe and crampons (not just microspikes) in addition to your beacon, shovel and probe. Natural avalanches aren’t likely during daylight hours, but human-triggered avalanches are possible with slabs 1-2’ thick in isolated areas; large enough to bury a person. A dust-on-crust surface exists on all elevations and aspects that aren’t either wind scoured or harboring these wind slabs. Moderate avalanche danger exists but may reach Considerable in the overnight hours when continued wind-loading makes natural avalanches possible.

The Winter Lion Head Route is the most direct route to climb to the summit from Pinkham Notch. The Tuckerman Ravine trail through the Bowl, and the Lion Head Summer Trail are much more exposed and pass through avalanche terrain.

Traveling in the mountains today will be challenging due to a thinly covered, breakable crust in lower elevation or wind sheltered areas and a dense, hard, icy surface in steeper areas more exposed to the wind. Pockets of older, stiff snow packed in by 100 mph west winds on Wednesday currently exist in some sheltered areas but not enough of it is around to allow for travel on foot without crampons. The new snow fall today will not improve skiing conditions much, in fact it will only serve to mask obstacles. The old adage to “ski the conditions, not your calendar” is once again a useful nugget of wisdom. Fat biking on packed trails or ice climbing may be a better option if you have the choice.

 

We just passed through one of the more active periods of snow and avalanche problems that we’ve had for some time, in part due to the absence of a typical January thaw that resets the snowpack. Unfortunately, the freezing rain and warm temperatures on Tuesday locked up the upper snowpack and spoiled everyone's powdery fun on skis in the backcountry. If you shift gears to ice climbing or mountaineering, keep this crust on your radar. It is an unforgiving surface that kills many more people in our range than avalanches. What would ordinarily be a harmless fall on stiff snow on a 30 degree slope has proven to be fatal in these icy conditions where self-arrest techniques simply do not work. Rope-up early and have your gear and technique completely dialed before venturing into the alpine. 

 

You may have noticed that the persistent slab avalanche problem is gone from the avalanche problems. This doesn’t mean that you won’t find faceted snow anymore. In fact, to the contrary, the new ice crust is likely to cause continued temperature and vapor pressure gradients that drive even more faceting. But without a snow load on top, there is no real avalanche problem so it’s off the list. Near crust faceting may be something to look at in the near future but the primary problem will likely be new snow blown into wind slabs which struggle to bond with the freezing rain crust. Our most recent bed surface and weak layer in our largest avalanche paths at middle and upper elevations ran on the smooth, wind-packed layer built by the wind event on January 24th that reached 157 mph on the summit of Washington. Perhaps the recent thaw and subsequent refreeze will change that.

 

Four more avalanche deaths occured in the past four days in the western US. Information on all US avalanche fatalities can be found here with details and accident reports appearing as they are submitted to the CAIC.  An interview with Simon Trautman of the National Avalanche Center on the recent cluster of fatal avalanche accidents can be found here. 

 

Thanks to everyone for taking the time to submit all the observations of snow and avalanche conditions, both inside and outside our avalanche forecast area. Please keep them coming. 

 

Your avalanche, snowpack, or weather observations are extremely valuable to the forecasters at MWAC. Help create a more accurate avalanche forecast by submitting your observations here. 

 

Listen to the weekly MWAC Outreach Podcast provided by Ski The Whites. Discussions include snowpack information, weekend outlook, and general avalanche related info. 

 

Thursday, February 25 @ 7PM - Barriers to Cognition and Perception with Blake Keogh  - A Free Zoom Webinar.

 

The Harvard Cabin is open for camping only with no entry allowed inside the cabin. There is no access to the breezeway at HoJos.

Please Remember:

• Safe travel in avalanche terrain requires training and experience. This forecast is just one tool to help you make your own decisions in avalanche terrain. You control your own risk by choosing where, when, and how you travel.
• Avalanche danger may change when actual weather differs from the higher summits forecast.

For more information contact the US Forest Service Snow Rangers, AMC visitor services staff at the Pinkham Notch Visitor Center, or the caretakers at Hermit Lake Shelters or seasonally at the Harvard Cabin (generally December 1 through March 31). The Mount Washington Ski Patrol is also available on spring weekends.