Avalanche Advisory for Monday, March 26, 2018

Huntington and Tuckerman Ravines have LOW avalanche danger. All forecast areas have Low avalanche danger. Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.

 AVALANCHE PROBLEM: Limited wind transport of the several inches of snow which fell in the past 48 hours make loose dry sluffs our primary avalanche problem. Loose snow avalanches won’t bury you today but could knock you off your feet and are possible on most steep slopes. The new snow is distributed fairly evenly across our terrain, though a few areas saw wind scouring and the possibility for small, isolated pockets of wind slab does exist. A firm and generally smooth surface of older snow exists beneath the thin new snow. Conditions are generally edge-able and good for crampon and ice axe travel, but don’t expect to arrest a fall with any ease. A long sliding fall which could be caused by a loose dry sluff or just a stumble is likely your primary hazard to manage today.

 WEATHER: Skies have trended toward the current clear conditions as northerly wind has remained below 30 mph, with the exception of a few gusts. Currently, wind on the summit is NE at 20 mph with a temperature of 6F. High pressure is allowing this weather to hold through today and tonight, with temperatures warming by a few degrees and wind remaining mild by Mount Washington standards. These generally pleasant conditions should persist into tomorrow morning before clouds, rising temperatures, and increasing winds arrive with a warm front later in the day. Precipitation forecast to begin late tomorrow or early Wednesday is currently forecast to be a wintry mix.

SNOWPACK: The significant snow which fell nearly two weeks ago now was heavily wind transported. It ultimately became hard, dry, and stubborn to unreactive slabs which are widespread in our terrain. Three inches of snow has fallen since Saturday and has been relatively unaffected by wind, with the exception being isolated areas of scouring and even more isolated pockets of wind slab. It’s not quite dust on crust conditions, with the old hard snow providing decent turning conditions and great crampon purchase, but certainly consider sliding falls when choosing terrain today. Though it’s nearly April and spring-like weather may be coming later this week, expect winter snow on this crisp but blue sky day.

The Harvard Cabin will be open all nights this week.

Please Remember:
• Safe travel in avalanche terrain requires training and experience. This advisory 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.
• Anticipate a changing avalanche danger when actual weather differs from the higher summits forecast. For more information contact the Forest Service Snow Rangers, the AMC at the Pinkham Notch Visitor Center, or the caretakers at Hermit Lake Shelters or Harvard Cabin.
• Posted  8:00 a.m., Monday, March 26, 2018. A new advisory will be issued tomorrow.

Ryan Matz, Snow Ranger
USDA Forest Service
White Mountain National Forest
(603) 466-2713 TTY (603) 466-2858