Tuckerman Ravine

December 22, 2019
By Mark Renson – AIARE

Instructed at an AIARE 1 course. Took following temps at Hermit Lake at roughly 11:45am-> TAir: 0c, TSurf: -6c, T10: -8c, T20: -9.5c.
We did some digging near Leve Rock in Tuckerman Ravine. Huge variability – I found HS 190cm with HS 85cm roughly . . .

Human Triggered Avalanche in Sluice – Tuckerman Ravine

December 21, 2019
By Jeff Fongemie – MWAC

Observed fresh avalanche crown with ski tracks entering in from lookers right. Slope SE, slightly convex, approx 40 degree slope angle. D1 hard slab, 30′ wide with a crown height 20″. Very little debris remained possibly due to fragmenting & . . .

Growing snowfields in Tuckerman & Huntington Ravines

December 20, 2019
By Jeffrey Fongemie – MWAC

Clear skies, calm wind. New snow Tuesday and Wednesday followed strong W wind has increased the size of snowfields in Tuckerman & Huntington Ravines, particularly mid-slope well below the sky line. In Tuckerman Ravine the sluff piles continue to . . .

Tuckerman’s Ravine

December 18, 2019
By Joseph Soccio – MWAC

On and off again clouds provided on and off again visibility. Calm W winds had little effect on the moderate amount of snow falling. A thin rain crust is present near and above tree line. Depth of the rain crust within the snowpack varies depending . . .

Graupel layer below Left Gulley.

December 18, 2019
By Tony Jewell – Northeast Mountaineering

We observed anywhere from about 10cm to 30cm of new snow on top of the Dec 15 crust in the area below The Chute and Left Gulley. (The crust varied from about 5cm to 20cm thick depending on aspect and was knife hard.) Multiple hand shears and tests . . .

12/17/2019 Huntington Ravine: Fan, Odell’s, Diagonal

December 17, 2019
By Josh Linker – UMass Outing Club

Snow (above Dec. 14/15 crust) leading up the fan to Odell’s, and within the gully itself, was unconsolidated, ranging in depth from 0″ to ~8″, mostly in the lower end of that range. Crust was ~2″ deep in places, but consistently soft/porous enough to . . .

Refrozen Snow Pack & Early Season Hazards

December 16, 2019
By Jeff Fongemie – MWAC

Clear blue skies & moderate/strong WNW wind. -2F (at 6262ft.) Majority of the snow pack consists of heavily textured, thoroughly refrozen snow after the rain on Saturday. Little continued snow transport observed at the ridge lines above the bowl. . . .

Hermit Lake/Sherburne – 20191215

December 15, 2019
By Mark Renson – AIARE

Instructed at an AIARE course. Roughly 55cm HS next to outlet of Hillman’s Highway near cache. Rain crust on top with some 4F and F hardness midpack with another rain crust below. Did CT and ECT tests with some hard planar results but no real . . .

Tuckerman’s Ravine Observations Going up Right Gully

December 11, 2019
By Eric Newton – Rensselaer Outing Club

Warm up and rain the last couple days condensed the snowpack considerably. Top firm alpine snow crust is about two to three inches thick. Beneath is dense snow of variable depth depending where you are. Lots of water still running underneath the . . .

Tuckerman Ravine from the floor of the Bowl

December 10, 2019
By Sebastian Dawson – AMC

Warm day with light precipitation before freezing temperatures overnight. Two skiers headed up Left Gully.


Snowpack observations are one part of the complex puzzle which is your decision to enter avalanche terrain. Some observations may include stability tests. It’s important to understand that the results of a stability tests are seldom conclusive anywhere, but particularly in snow climates and terrain like ours where the primary driver of instabilities is wind drifted snow. Many stability tests exist and each works best with specific avalanche problem types. Stability test results should never be used alone as an indication that a slope or conditions are safe particularly when more obvious red flags are present. Please use this page as part of your information gathering process, but don’t make decisions based on a single piece of information. A good article that summarizes some of the issues associated with snow and avalanche observations can be found here.

The Mount Washington Avalanche Center cannot verify the quality or accuracy of any observations that come from the general public.


See an avalanche or evidence of previous avalanche activity?  Near-miss? Snowpack observations?

Your observations are valuable to an accurate forecast! We welcome observations from everyone. You don’t need to be an avalanche professional to submit helpful observations, just be as detailed and accurate as you can.