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 . . .

Dec. 22 crust as a bed surface and Great Gulf avalanche activity

January 14, 2019
By Ryan Matz – MWAC Forecaster

Avalanches occurred on a number of bed surfaces during and following last week’s storm, but several appear to run on the Dec. 22 crust which is easily identified by being close to impenetrable. The deepest bed surface currently visible in Tuckerman . . .

Avalanche Debris – South Snowfields, Gulf of Slides

January 14, 2019
By Jeff Fongemie – Mount Washington Avalanche Center

Observed wind scoured avalanche debris at the South Snowfields in the Gulf of Slides from avalanche activity that likely occurred during the Jan 9-10 storm. The debris field is impressively large, and completely buried the many of the 6 foot tall . . .

Tuckerman Ravine, post wind event

January 13, 2019
By Ryan Matz – MWAC Forecaster

Varied snow surfaces and upper snowpack, all heavily wind affected. A number of crowns visible, as in photo. Snow surface generally firm (1F), and the sastrugi in the floor of the ravine is as big or bigger than it looks in the picture.
Moderate to . . .

Huntington Ravine photos

January 13, 2019
By Ryan Matz – MWAC Forecaster

Notably less storm snow deposited/remaining in Huntington Ravine. Avalanche path development resembles pre-storm conditions.

Avalanche in Center Bowl, Tuckerman Ravine

January 12, 2019
By Ryan Matz – MWAC Forecaster

Naturally triggered, suspected to have occurred yesterday or last night (1/11-1/12). Visually observed from Hermit Lake. Crown width approximately 300’, height approximately 12”.

Avalanche in Gulf of Slides

January 12, 2019
By Rob

looks like a recent slide, maybe a day or two old.

Observation of snowpack on South Facing slope around 3500′

January 12, 2019
By Mason Irish

Pit Location was around 3500′. Results were ECT N. The layer of concern was a thin layer of small facets (4finger-Fist hardness) resting on the Christmas freezing rain crust. The snow pack, about 24″ deep, above this facet layer was right side up . . .

Natural Avalanche, Hillman’s Highway, Tuckerman Ravine

January 11, 2019
By Jeff Fongemie – Mount Washington Avalanche Center

Naturally triggered avalanche occurring likely Wednesday evening, January 9 or possibly January 10. Looking up the gully, start zone obscured by blowing snow. Debris heavily wind affected. It appears that the avalanche ran from above the Christmas . . .

Avalanches in and around Tuckerman Ravine

January 11, 2019
By Frank C

Signs of widespread avalanche activity some of which was large, following snow and wind during the past few days. Observed wind scoured debris in the following locations:
Lobster Claw – D2
Floor (from Headwall) D4
Left Gully D2
Duchess D2
Empress . . .


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.