Presidential Range

Watch out for areas of unstable snow on steep easterly slopes above 3000 feet in elevation where even a small avalanche has consequences. A mountaineering mindset and tools, including crampons, ice axes, and helmets, are necessary for preventing a dangerous fall in steep terrain.

Observations from the field indicate that the 8 inches of snow from the April 8–9 storm systems has settled and bonded well to the underlying snow surface. This stabilization trend was supported by yesterday’s clear weather, which contributed to snowpack consolidation and promoted bonding within recent wind slab layers and the bed surface below. As a result, overall stability has increased.

Today, expect variable snow surfaces across the forecast area. Firm, icy snow will be found on some aspects, while other areas will offer softer snow that is generally stable. Although general stability is good, small pockets of wind drifted snow may linger in steep, unsupported terrain. These isolated wind slabs could still exhibit some reactivity. While these slabs are expected to be relatively limited in size, their location on steep slopes could make even a small avalanche hazardous, particularly if it initiates a long sliding fall.

Looking ahead, we are closely monitoring an approaching low pressure system for tomorrow’s forecast. Typical of spring weather patterns, the interaction of warm and cold air masses is introducing a degree of uncertainty in precipitation type and snowfall amounts. However, current model trends suggest decreasing snow totals and wind speeds, with no strong indications of a significant increase in avalanche hazard at this time. We anticipate greater clarity on storm impacts by tomorrow morning’s avalanche forecast.

It’s worth refreshing your knowledge on the most dangerous mountain hazards you could encounter during this time of year. Snow holes, undermined snow, and icy slopes could be hidden by new snow today. 

• Long Sliding Falls: Long sliding falls are one of the most serious hazards in the White Mountains during the winter and spring. When snow surfaces become firm or icy, especially after a freeze or rain event, a simple stumble can quickly turn into an uncontrollable slide-for-life. These falls often result in traumatic injuries and can be fatal. Steep terrain like the Summer Lion Head Trail Traverse leaves little room for error. Preventing a fall is your best defense: this means wearing crampons, using an ice axe, and using deliberate, well-practiced footwork. Once you're sliding, it’s often too late.Exposed rocks, trees, and ice could amplify the consequences of a fall. Knowing what is below you will be important as these hazards can make more areas no-fall zones.
• Undermined snow: Meltwater flowing under the snowpack melts away the snow above, creating thin bridges of snow that can collapse. These will emerge at the tops of gullies (particularly on south-facing slopes) and in areas that have streams running, like the brook feeding the Little Headwall. The sound of running water can sometimes be heard under the snow and is a good indicator of this hazard.
• Snow holes: Snow holes are opening up. These openings in the snowpack can be very deep and large enough for a person to fall into. In most cases, these openings have no reasonable exit until the snow completely finishes melting. These features have been a factor in several accidents over the years.

Check out our Springtime Mountain Hazards page for more info.

OBSERVATIONS: Please consider submitting an observation on our website or in the new Avy phone app of what you are seeing in your travels. Submitting an observation hones your skills, informs other users, and improves our forecasts.