Natural avalanche evidence, Tuckerman Ravine

February 1, 2019
By Ryan Matz – MWAC Forecaster

Crown lines visible in Sluice, Lip, Center Bowl, Lower Snowfields below Duchess, hanging snowfield in Empress above lower snowfields. All suspected to have avalanched naturally some time between Wednesday night and early this morning. Active wind . . .

Non-reactive Wind Slabs on Cinema Gully

February 1, 2019
By Nick Aiello-Popeo – Synnott Mountain Guides

I was guiding on Thursday and Friday on Mt. Willard’s Cinema and Cauliflower Gullies. Despite west winds building wind slabs on the SW aspect, the snow was not reactive. Wind slabs were soft (1F), 10 to 35 cm thick, and laying above a layer of . . .

Huntington Ravine obs

January 30, 2019
By Frank

Summit wind was around 50 mph but some clearing in the clouds allowed for good definition in the snow. Pillows of snow had already developed in the fine but upper parts of the gullies remained obscured. Shooting cracks on the way up and very easy . . .

Avalanche Observation, Odell Gully

January 28, 2019
By Helon Hoffer – Mount Washington Avalanche Center

Odell Gully
Likely occurred evening of 1/27 or later that night.
Upon touring into Huntington, debris was visible in the run out of Odell Gully. We could not identify a crown, though we think it initiated on or just below the ice. The . . .

Wildcat test slope

January 23, 2019
By Ben Allen – Wildcat ski Patrol

The wind slab verried in thickness form 60cm to 100cm. Walking and ski cutting on the slab got no results. Snow stability test showed a weak layer will to propagate if triggered with the right stress.

Avalanche Hillman’s Highway

January 22, 2019
By Jeff Fongemie – Mount Washington Avalanche Center

Naturally triggered at some point during the storm on Sunday or wind loading on Monday (1/20-1/21). Crown high in the gully lookers left. Visually observed from Hermit Lake. Crown width approximately 150’.

Huntington Ravine photo

January 22, 2019
By Chris Wu – Harvard Cabin

Here is a photo of Huntington Ravine following the snow and wind events. The Fire Road has full snow coverage.

Storm slabs

January 20, 2019
By Ben Allen

The photos are from the bill hill glades in gorham. I got whoops all morning and got those two small test slope to slide. Today 1/21/19 we tried a line in the kanc. On the skin in we got several whoops, lots of cracking and slumping. The slab verried . . .

Monroe Brook, variable snowpack

January 18, 2019
By Ryan Matz – MWAC Forecaster

A high degree of spatial variability in the snowpack, with the 4200-4800’ elevation section now a well developed avalanche path due to an avalanche last week and subsequent reloading.
We found a mix of soft (4F-F) and hard (1F) slabs as a snow . . .

Avalanche Observation, Monroe Brook

January 18, 2019
By Helon Hoffer – Mount Washington Avalanche Center

We ascended and descended Monroe Brook today. Upon reaching 4200′ in the gully proper, we found avalanche debris from within the past week or so. We turned around under 5000′. Our guess is that the the start zone we could see around 4800′ was where . . .


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.